ASE A5 Brakes
The first piston installed when rebuilding a master cylinder is the: a. Primary piston b. Secondary piston c. QTU piston d. Compensating piston
b
With Hydro-Boost, when you discharge the accumulator, then start the engine, the pedal should: a. Push back b. Push back, then sink toward the floor c. Sink toward the floor, then push back d. Sink toward the floor
c
True or False: A stuck ABS isolation valve could cause a brake pull. a. True b. False
a
On calipers with fixed seals, most manufacturers recommend a caliper to bore clearance of: a. .001-.006 inch for metal pistons; .0005-.0015 for aluminum pistons b. .002-.003 inch for aluminum pistons; .003-.007 inch for phenolic pistons c. .004-.006 inch for metal pistons; .002-.006 inch for phenolic pistons d. .002-.005 inch for metal pistons; .005-.010 inch for phenolic pistons
d
Phenolic resin caliper pistons should be replaced if an inspection reveals any of the following EXCEPT: a. Cracks extending across the piston face b. Gouges near the dust boot groove c. Scuffed or scored outer diameter surface d. Minor nicks or gouges at the outer edge
d
A bypassing master cylinder can be detected by the: a. Internal leak test b. External leak test c. Compensating port test d. QTU test
a
After bleeding brakes: a. The pressure differential switch may need to be recentered. b. The metering valve may need to be adjusted c. The proportioning valve may need to be recentered d. The pressure differential switch may need to be adjusted.
a
An ABS warning lamp that comes on when the vehicle first begins to move generally indicates: a. A wheel speed sensor problem b. A master cylinder problem c. An isolation valve problem d. An accumulator problem
a
Diagnose the condition of sealed, double-row bearings with: a. A dial indicator b. A seal inspection c. A micrometer d. A torque wrench
a
Generally speaking, which of the wheel brakes should you bleed first? a. The one farthest from the master cylinder b. The one closest to the master cylinder c. The one closest to the driver d. The one closest to the passenger
a
If a vacuum power booster is in good condition, starting the engine after the booster has been depleted will cause the brake pedal to: a. Sink slightly b. Pulse rapidly c. Rise slightly d. Stay the same
a
On a front brake hose that does not have a banjo fitting, which end do you disconnect first? a. Female end b. Male end c. Caliper end d. Either end
a
Set the initial brake adjustment with a: a. Shoe setting caliper b. Brake micrometer c. Screw driver after the drum is installed d. Torque wrench
a
Technician A says that a feeler gauge and a new piston can be used to check for an oversized master cylinder bore. Technician B says that honing a master cylinder bore should leave the bore wall completely smooth. Who is right? a. A only b. B only c. Neither A nor B d. Both A and B
a
Technician A says that a low brake pedal may be caused by lack of self adjustment of rear disc calipers with integral parking brake. Technician B says that a low brake pedal may be caused by worn out front disc brake pads. Who is right? a. Technician A b. Technician B c. Both d. Neither
a
Technician A says that a low pedal complaint may be due to inoperative drum brake self-adjusters. Technician B says that a low pedal complaint may be due to weak shoe return springs. Who is right? a. Technician A b. Technician B c. Both d. Neither
a
Technician A says that a new bearing should never be installed in an old bearing race. Technician B says that all wheel bearings are adjustable. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
a
Technician A says that brake drums should always be replaced if they are cracked. Technician B says that brake drums should be reinstalled on the wheel opposite from where they were removed. Who is right? a. Technician A b. Technician B c. Both d. Neither
a
Technician A says that if wheel cylinder pistons are seized in the extend position, the brake will fail to retract completely causing a dragging condition, overheating, and premature lining/drum wear. Technician B says that seized rear drum brake wheel cylinder pistons will cause a low pedal condition. Who is right? a. Technician A b. Technician B c. Both d. Neither
a
Technician A says that the first thing to do when diagnosing a red brake warning lamp is to check the brake master cylinder fluid level. Technician B says that the first thing to do is inspect the parking brake system. Who is right? a. Technician A b. Technician B c. Neither d. Both
a
Technician A says that the maximum axial play in a sealed front wheel bearing of a typical FWD car is .002 inch. Technician B says that the maximum axial play in a sealed front wheel bearing of a typical FWD car is .005 inch . Who is right? a. Technician A b. Technician B c. Both d. Neither
a
Technician A says that when servicing the ABS computer, care should be taken not to expose it to electrostatic discharge. Technician B says that it is ok to disconnect wheel speed sensors when the ignition switch is on. Who is right? a. Technician A b. Technician B c. Neither d. Both
a
Technician A says that with the engine off you should feel that power assist is present for at least two pedal strokes with a vacuum booster. Technician B says the vacuum in the booster should disappear immediately when the engine is shut down. Who is right? a. Technician A b. Technician B c. Both d. Neither
a
The QTU valve on a master cylinder regulates fluid flow: a. Between the master cylinder and the reservoir b. Between the two chambers of the reservoir c. Between opposite wheels d. Between the two channels of the master cylinder
a
The axial play of a typical tapered roller wheel bearing assembly should be: a. 0.001 to 0.005 inch (0.025 to 0.127 mm) b. 0.010 to 0.020 inch (0.050 to 0.100 mm) c. 0.010 to 0.050 inch (0.50 to 1.0 mm) d. Less than 0.002 inch (0.05 mm)
a
The first component in a brake system bleeding sequence is the: a. Master cylinder b. Wheel cylinder c. Combination valve d. Proportioning valve
a
The first component in a brake system bleeding sequence is the: a. Master cylinder b. Wheel cylinder c. Combination valve d. Proportioning valve
a
The quick-take-up (QTU) valve on a master cylinder regulates fluid flow: a. Between the master cylinder and the reservoir b. Between the reservoir and the pushrod c. Between opposite wheels d. Between the two hydraulic circuits of the system
a
To detect an out-of-round brake drum, measure it with a: a. Drum micrometer b. Drum gauge c. Drum dial indicator d. Shoe setting caliper
a
True or False: Failure to properly install a vehicle's wheels could result in poor brake system performance. a. True b. False
a
True or False: Some calipers can require special tools to retract the piston. a. True b. False
a
True or False? An unwanted ground may cause the red brake warning lamp to illuminate, even if there are no other problems in the system. a. True b. False
a
When assembling a drum brake, apply hightemperature brake grease to the: a. Contact pads on the backing plate b. Shoe webs c. Parking brake cables d. Return spring anchors
a
When multiple trouble codes are present in an antilock system, look for: a. A weak connection at a common ground b. An open circuit c. Low-voltage signals d. Two or more faulty sensors
a
When you blow into a vacuum check valve in the direction of the intake manifold: a. Air should pass through freely b. Air should not pass through c. Air should pass through with difficulty d. You should feel the check valve vibrate
a
When you encounter multiple ABS DTC's, all of the following are true EXCEPT: a. The codes can be diagnosed in any order you choose b. Multiple codes could indicate a loose or corroded connection c. One of the codes may be responsible for setting the other codes d. The first step is to record and clear all codes present
a
Which of the following statements are not true about on-car brake lathes: a. On-car lathes may induce lateral runout b. On-car lathes allow rotor machining on the vehicle spindle center line. c. The bits used on some on-car lathes cannot be interchanged with those of bench lathes. d. You must compensate for lathe runout before the first cut is taken.
a
Which of the following statements are true: a. Rotor lateral runout will lead to disc thickness variation b. Wheel lug nuts should be tightened with an air impact wrench, as long as the proper tightening sequence is used. c. Rotor runout cannot be caused by overtorquing of lug nuts. d. Use a dial indicator to measure rotor taper variation
a
A correctly honed cylinder bore should: a. Have a smooth, polished surface b. Have a cross-hatch pattern c. Be larger than the original size by a specified amount d. Have scoring no deeper than 0.006 inch (0.15 mm)
b
As a general rule, disc brake pads must be replaced if the friction lining thickness measures less than: a. 0.020 inch b. 0.030 inch c. 0.060 inch d. 0.130 inch
b
Drums should be visually inspected for all of the following EXCEPT: a. Hard spots b. An out-of-round condition c. Scoring d. Cracks
b
For best results, what drill motor speed should be used when honing a caliper piston bore? a. 300 rpm b. 500 rpm c. 1000 rpm d. 1200 rpm
b
Hard pulling to one side during braking may be caused by: a. Worn pads b. A seized caliper piston on the opposite side to that of the pull c. Loose pad mountings d. Worn sliding ways
b
Honing will remove the anodized finish on which type of master cylinder? a. Add-on ABS b. Aluminum c. Cast iron d. Composite
b
If both the BRAKE and ABS warning lamps illuminate and power assist is low on an integral ABS system, the probable cause is: a. A wheel speed sensor or circuit failure b. An inoperative pump or an accumulator pressure leak c. Dirt in the ABS control valve preventing the dump valve from seating d. A malfunctioning isolation valve or a stuck open dump valve
b
Pulsation or shudder during braking may be caused by: a. Weak drum brake shoe return springs b. A cracked drum c. Bellmouthed drum wear d. A seized starwheel adjuster
b
Technician A says a cracked brake hose that is not leaking need not be replaced. Technician B says a brake hose with a blister must be replaced. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
b
Technician A says that ABS wheel speed sensors are not adjustable. Technician B says that some ABS wheel speed sensors require adjustment upon installation. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
b
Technician A says that during a master cylinder overhaul, the primary piston is the first piston installed on assembly. Technician B says that during a master cylinder overhaul, the secondary piston is the first piston installed on assembly. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
b
Technician A says that if there is too much travel in the parking brake lever the cables should be shortened. Technician B says that if there is too much travel in the parking brake lever the adjustment of the rear brake lining-to-drum or lining-to-disc clearance should be checked. Who is right? a. Technician A b. Technician B c. Both d. Neither
b
Technician A says that scored rotors cause pedal pulsation. Technician B says that pulsation is caused by disc thickness variation. Who is right? a. Technician A b. Technician B c. Both d. Neither
b
Technician A says that the a shorted indicator lamp circuit may cause the red brake lamp to illuminate. Technician B says that an ABS system failure could cause the red brake lamp to illuminate. Who is right? a. Technician A b. Technician B c. Neither d. Both
b
Technician A says that wheel lug nuts should be tightened in a star pattern with an impact wrench. Technician B says that wheel lug nuts should be tightened in the proper pattern with a torque wrench. Who is right? a. Technician A b. Technician B c. Both d. Neither
b
Technician A says that when turning drums or rotors, both components on the same axle must be machined to the same tolerance. Technician B says that the least amount of metal should be removed during machining. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
b
The brakes of a four wheel disc brake system are self-applying and locking up after only a few miles of travel. Which of the following is the MOST likely cause of this condition? A. A blocked master cylinder replenishing port. B. A blocked master cylinder vent port. C. Worn master cylinder cup seals. D. Low intake manifold vacuum.
b
The master cylinder should be cleaned with: a. Kerosene or carburetor cleaner b. Brake parts cleaner or brake fluid c. Fresh solvent or hot, soapy water d. Motor oil or cutting oil
b
The most precise way to test metering valves is with: a. A pressure bleeder b. Pressure gauges c. An override tool d. Vacuum gauge
b
To pressure-bleed the rear brakes of an integral antilock system, the bleeder should be charged to: a. 25 psi (172 kPa) b. 35 psi (241 kPa) c. 45 psi (310 kPa) d. 55 psi (379 kPa)
b
Which of the following are NOT true about wire repairs made to the ABS system? a. Wires should be soldered and sealed with shrink tubing that contains a special wax sealant b. Solder the wires together using a suitable acid core solder c. Damage to the wires can occur if they are improperly stripped d. Tape should never be used to hold the wires together
b
Brake pedal reserve that gradually fades under light pressure indicates: a. A brake line restriction b. Spring tension on the brake pedal is weak c. Internal leaks d. The system is operating properly
c
Brake pedal reserve that gradually fades under light pressure indicates: a. Leaks in the brake lines b. Weak brake pedal return spring tension c. Internal leaks d. The system is operating properly
c
Brake squeal may be caused by all of the following EXCEPT: a. A poor rotor friction surface b. Missing pad shims c. A leaking caliper piston seal d. Poor quality linings
c
Fixed drums are held in place with: a. The axle nut b. Threadlocker compound c. Tinnerman nuts d. Welds
c
Height-sensing proportioning valves: a. Cannot be adjusted b. Are used only on FWD vehicles c. Can be adjusted in many cases d. Are often the cause of brake problems
c
If a brake hose requires replacement: a. Cut the hose and splice in a new section b. Patch the hose using a suitable patching solution c. Replace the hose d. Fabricate a new hose and replace the old hose
c
If an external leak is present, but is not obvious: a. The brake fluid evaporated b. The fluid was lost internally c. Have an assistant pump the brakes and inspect for leaks while the system is under hydraulic pressure d. Pump the brakes until the red brake warning indicator illuminates
c
If the parking brake will not keep the vehicle from rolling on an incline, the cause may be: a. Seized wheel cylinder pistons b. Cables shortened excessively at last reline c. Seized cables d. Out-of-round drums
c
On calipers with stroking seals, most manufacturers specify a caliper piston-to-bore clearance of: a. 0.004 to 0.006 inch (mm) b. 0.004 to 0.008 inch (mm) c. 0.004 to 0.010 inch (mm) d. 0.004 to 0.014 inch (mm)
c
Slight taper wear on disc brake pads removed from a floating caliper is most likely the result of: a. A sticking caliper piston b. A lack of caliper guide pin lubrication c. Normal wear d. A lack of rotor parallelism
c
Tapered roller wheel bearings can be adjusted by all of the following EXCEPT: a. Hand method b. Torque wrench method c. Tension gauge method d. Dial indicator method
c
Technician A says runout may be caused by overtorquing of lug nuts. Technician B says lateral runout will lead to disc thickness variation. Who is right? a. Technician A b. Technician B c. Both d. Neither
c
Technician A says that a basic ABS diagnosis includes checking for a fully charged battery. Technician B says that a basic ABS diagnosis includes checking for blown fuses. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
c
Technician A says that incorrect tire size could cause a wheel speed sensor code. Technician B says that tire size will not affect the ABS system in any way. Who is right? a. Both b. Neither c. Technician A d. Technician B
c
Technician A says that loose wheel bearings can cause a vibration when the brakes are applied. Technician B says that loose wheel bearings can add to rotor lateral runout. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
c
Technician A says that the hydro-boost system performs the same function as a vacuum assist system. Technician B says that the hydro-boost accumulator can provide one or more brake pedal applications in the event of a power steering system hydraulic failure. Who is correct? a. Technician A b. Technician B c. Both d. Neither
c
Technician A says the pressure differential switch may need to be recentered after bleeding the brakes. Technician B says there are several types of pressure differential switches, and each requires a different method for recentering. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
c
The Hydro-Boost pretest inspection includes: a. Pressure testing the power steering pump b. Checking accumulator reserve c. Checking the power steering pump fluid level d. Testing Hydro-Boost function
c
To avoid spraying the vehicle with brake fluid when removing a hydraulic part from an integral ABS system, it is important to first: a. Bleed the system b. Wrap the connection with a shop towel c. Relieve system pressure d. Siphon fluid from the reservoir
c
To bleed the rear brakes of an integral ABS, the pressure bleeder should be charged to: a. 15 psi (103 kPa) b. 25 psi (172 kPa) c. 35 psi (241 kPa) d. 45 psi (310 kPa)
c
To check the fluid level on an integral antilock system when the accumulator must be charged: a. Switch the ignition OFF, pump the brake pedal until the pedal feels hard, then check the fluid level b. Check fluid level as you would on a vehicle without ABS c. Switch the ignition ON, pump the brake pedal to start the pump motor, then check the fluid level after the pump stops d. Switch the ignition ON, pump the brake pedal to start the pump motor, then check the fluid level with the pump running
c
Use a dial indicator to check a rotor for: a. Lack of parallelism b. Taper variation c. Lateral runout d. Radial runout
c
When inspecting wheel speed sensors, check for all of the following EXCEPT: a. Condition of the tone wheel teeth b. Secure sensor mounting c. Correct input voltage d. Proper air gap between the sensor and tone ring
c
A dial indicator can be used to check a brake rotor for: a. Radial runout b. Parallelism c. Taper variation d. Lateral runout
d
A leaky wheel cylinder can cause: a. Grabbing b. Loss of stopping power c. A grunting or groaning noise when the brakes are applied d. All of the above
d
A vehicle equipped with ABS exhibits a brake pull when the brakes are moderately applied. The amber ABS indicator on the dash is functioning correctly and proves out when the vehicle is started. The most likely cause of the brake pull is: a. A stuck ABS isolation valve b. A faulty wheel speed sensor signal c. A blown ABS pump motor fuse d. A concern not related to the ABS system
d
A vehicle has the master cylinder mounted next to the steering column in front of the driver. Technician A says that the right front wheel is the first to be bled, followed by the left rear. Technician B says that it takes 3 to 5 strokes of the pedal to bleed each cylinder, and the bleeder valve should be closed prior to the down stroke. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
d
A wheel bearing that needs to be serviced may exhibit all of the following EXCEPT: a. Roughness b. Grease seal leakage c. Excessive axial play d. Lack of parallelism
d
All of the following indicate that wheel bearings need service EXCEPT: a. A growling sound that increases with cornering loads b. A body vibration that occurs when the brakes are applied c. Roughness, grease seal leakage, and excessive axial play d. A growling sound that occurs only when the brakes are applied
d
Brake lights should come on when the brake pedal moves down: a. 0.005 in. b. 0.05 in. c. 1/8th in. d. ½ in.
d
Check for pedal pulsation in front disc brakes by: a. Applying the brakes in reverse b. Braking hard from high speed c. Coasting and applying the parking brake d. Feeling for steering wheel rocking while braking lightly at low speed
d
Floating drums may be held in place by all of the following EXCEPT: a. Speed nuts over the wheel studs b. Bolts threaded into the hub c. The wheel and lug nuts d. A castellated spindle nut
d
How many power assisted applications should the Hydro-Boost II have in reserve if the accumulator is working properly? a. 5 or 6 b. 4 or 5 c. 3 or 4 d. 1 or 2
d
If a caliper is replaced, what should be used to seal the connection with the hose? a. Teflon tape b. Threadlocking compound c. Anarobic liquid gasket d. New copper washers
d
If the ABS and BRAKE warning lamps are on and the power assist is low, the most likely cause would be: a. Inoperative ABS control module b. A faulty ABS isolation valve c. One or more faulty wheel speed sensors d. An inoperative pump or an accumulator pressure leak
d
Pistons may be extracted from caliper bores by means of: a. System hydraulic pressure b. Shop air pressure c. Special tools that grasp the piston d. All of the above
d
Technician A says an outside micrometer is the preferred tool for measuring rotor lateral runout. Technician B says a dial indicator is the preferred tool used for measuring rotor thickness. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A or B
d
Technician A says that the shoe with the shorter lining is the primary and should be installed at the rear of the assembly. Technician B says that the shoe with the longer lining is the primary and should be installed at the rear of the assembly. Who is right? a. Technician A b. Technician B c. Both d. Neither
d
Technician A says that when replacing a metal brake line, flare nut wrenches should be used to loosen the fittings. Technician B states that when replacing a metal brake line, make sure to route it in the original locations that the old line came from. Who is right? a. Technician A b. Technician B c. Neither d. Both
d
Technician A says the best way to test a proportioning valve is with a feeler gauge. Technician B says the best way to test a proportioning valve is with a vacuum gauge. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
d
The peak accumulator pressure developed by an ABS hydraulic pump may be as high as: a. 600 psi (4137 kPa) b. 1,200 psi (8274 kPa) c. 1,800 psi (12,573 kPa) d. 2,700 psi (18,616 kPa)
d
To avoid causing damage, remove caliper piston seals with a: a. Pair of needle-nose pliers b. Small screwdriver c. Small steel pick d. Plastic or wood probe
d
Typically, manufacturers allow rotors to be reused if thickness variation does not exceed: a. 0.005 inch b. 0.002 inch c. 0.001 inch d. 0.0005 inch
d
What special tool is required to pressure bleed a system equipped with a metering valve? a. An adjustment gauge b. A torque wrench c. A vacuum tool d. An override tool
d
When first testing a car equipped with ABS, it is important to: a. Try to lock the brakes b. Disconnect the battery ground c. Use the parking brake d. Note the status of the ABS warning light
d
Which of the following CANNOT be measured with an inside micrometer? a. Drum inside diameter b. Drum taper, barrel, and bellmouth distortion c. Out-of-round distortion d. Eccentric drum distortion
d
Which of the following is NOT a method used to force air and contaminated fluid out of a brake system? a. Manual brake bleeding b. Pressure tank bleeding c. Vacuum bleeding d. Bench bleeding
d
Which of the following is NOT used to hold floating drums in place? a. Speed nuts b. Bolts threaded into the hub c. The wheel and lug nuts d. A large nut that preloads the wheel bearing
d
Which of the following statements is NOT true? a. Some imports use HSMO, a green colored oil, as brake fluid b. Silicone, or DOT 5 brake fluids, contain a purple dye c. Polyglycol brake fluids are amber to clear in color d. All DOT approved brake fluids are hygroscopic
d
