A5 ASE Brakes
A spongy brake pedal on a vehicle with 4-wheel disc brakes with a longer than normal travel indicates which of the following? a. Air in the hydraulic system b. Caliper piston seized c. Parking brake out of adjustment d. A faulty power booster
A.
A vehicle comes in with a complaint of excessive pedal travel before the brakes apply. Technician A says the master cylinder pushrod adjustment is incorrect. Technician B says the cause is a faulty residual pressure check valve admitting air. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
A.
After a brake application, the caliper piston is returned by: A. the twisting action of the seal. B. a return spring. C. brake fluid pressure. D. atmospheric pressure.
A.
After honing a brake caliper, the maximum allowable increase in caliper bore diameter is: A. 0.001 in (0.025 mm). B. 0.002 in (0.050 mm). C. 0.005 in (0.127 mm) D. 0.008 in (0.043 mm).
A.
Brake systems contain all of the following components EXCEPT: A. double wall copper tubing. B. high pressure rubber tubing. C. double wall steel tubing. D. flare nuts.
A.
On a single piston floating caliper, the inside brake pad lining is worn out, but there is very little wear on the outside pad lining. The cause of the problem could be: A. worn caliper pins and bushings. B. a leaking caliper piston seal. C. a leaking brake hose. D. excessive rotor lateral runout.
A.
The brake pedal on a vehicle with power-assisted disc/drum brakes moves slowly to the floor during braking. Which of these could be the cause? (A) A leaking master cylinder primary cup (B) A leaking power brake booster (C) A leaking master cylinder residual check valve (D) An internal leak in the combination valve
A.
The drag on a vehicle's drum brakes increases after each application until they lockup. Bleeding the system restores normal operation for a short time; then drag increases until the brakes lockup again. Which of these could be the cause? (A) A blocked compensating port (B) A blocked breather port (C) Wrong brake shoe adjustment (D) Weak brake shoe return springs
A.
The front wheel bearings are being adjusted. Technician A says you torque the adjusting nut to a specified torque and back off the nut till it lines up with the hole and install the cotter pin. Technician B says backing off the castle nut will cause the bearing to overheat. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
A.
There are signs of paint removal and peeling on the power brake booster right below the master cylinder. The cause of this could be: A. A leaking secondary cup on the primary piston. B. A defective diaphragm in the brake booster. C. A leaking secondary cup on the second piston. D. Fuel being drawn into the booster by the vacuum.
A.
This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. A vehicle has a very erratic brake pulling concern while applying the brakes. All of the following items could cause this erratic pull EXCEPT: a. Excessive tire pressure b. Four-wheel alignment c. Seized caliper piston on the other side d. Steering gear problem
A.
When performing a vacuum booster function test, you should begin by pumping the brake pedal several times _______________. a. with the engine off b. with the engine running c. with the vacuum hoses removed d. while driving the vehicle slowly
A.
A front disc brake rotor is slightly below minimum thickness specification after machining. The technician should: (A) reuse the rotor. (B) replace the rotor. (C) apply a non-directional finish to the rotor. (D) machine the other front rotor to the same thickness.
B.
A vehicle has no brake pedal free play. This problem may cause: A. a low brake pedal. B. pressure build-up and dragging brakes. C. a spongy brake pedal. D. fluid leaking past the primary piston cups.
B.
A vehicle pulls to the left during a brake application. The cause of the problem could be: A. The right front brake linings are contaminated with grease. B. The piston is seized in the right front brake caliper. C. The master cylinder pistons are swollen from contaminated fluid. D. The secondary compensating port is plugged in the master cylinder.
B.
A vehicle with 4-wheel disc brakes has a brake squeal. Technician A says a defective proportioning valve could be the cause. Technician B says disc brake squeal is often caused by movement of the disc brake pad during braking. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
B.
All of the following statements are true about brake drum inside diameter measurements with a brake drum micrometer EXCEPT: A. The drum should be cleaned before measuring the diameter. B. If the drum diameter is less than specified, replace the drum. C. The diameter should be measured at two locations around the drum. D. The drum diameter variation should not exceed 0.035 in (0.009 mm).
B.
During a surge bleeding procedure: A. The end of the bleeder hose must be kept above the level of the fluid in the container. B. Pump the pedal quickly several times with the bleeder screw closed. C. Pump the pedal quickly several times while opening the bleeder screw. D. Decrease the pressure bleeder chamber pressure to 10 psi (69 kPa)
B.
In most cast iron master cylinders, the distance from the brake fluid level to the top of the reservoir casting should be: A. 0 in (0 mm). B. 0.25 in (6.35 mm). C. 0.75 in (19 mm). D. 1.00 in (25.4 mm).
B.
On a car with single piston floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. The other brake pad is slightly worn. Technician A says excessive rotor run out could be the cause. Technician B says insufficient clearance between the pads and caliper slider could be the cause. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
B.
On a vehicle with front disc and rear drum brakes, a scraping noise is present in one front wheel while braking. The cause of this problem could be: A. worn caliper pins and bushings. B. the pad wear sensor contacting the rotor. C. loose caliper mounting bolts. D. a loose pad mounting in the caliper.
B.
The ABS (antilock brake system) amber light does not go off after the engine is started. Technician A says a parking brake not fully released could be the cause. Technician B says when this happens the brakes will operate like a normal non-ABS brake system. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
B.
The front brake rotors and pads are being replaced on a vehicle equipped with a TCS (traction control system) and electronic stability control system (ESC). Technician A says the yaw rate and deceleration sensor should be recalibrated. Technician B says the new rotors should be indexed to the hub using a dial indicator for the least amount of runout. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
B.
There is evidence of brake fluid leakage into the engine. The cause of the problem could be: A. a defective vacuum hose to the brake booster. B. a defective one-way check valve in the booster vacuum hose. C. a defective PCV valve with excessive restriction. D. a partially restricted air cleaner element.
B.
Which of the following conditions can cause brake pedal fade? a. Seized wheel cylinder piston b. Brake drum machined beyond its limit c. Leakage past the master cylinder cups d. Air in the hydraulic system
B.
While discussing brake backing plates, Technician A says a bent backing plate may cause brake grabbing. Technician B says a loose anchor bolt may cause brake chatter. Who is right? A. A only B. B only C. Both A and B D. Neither A nor B
B.
While machining a brake drum: A. Tool chatter marks may be caused by excessive damping belt tension. B. The tool bit depth for a rough cut should be 0.005 to 0.010 in (0.127 to 0.254 mm). C. The tool bit depth for a rough cut should be 0.010 to 0.020 in (0.254 to 0.508 mm). D. The tool bit depth for a finish cut should be 0.008 to 0.010 in (0.203 to 0.127 mm).
B.
While reassembling a brake caliper: A. The boot should be installed and seated, folloed by the seal. B. Coat the piston seal and boot with clean brake fluid. C. Leave the piston dry and install it through the boot and seal until it bottoms. D. Plug the bleeder screw hole and the high pressure inlet while installing the piston.
B.
A metering valve delays pressure to which set of brakes under which braking condition? A. The rear brakes under light braking B. The rear brakes under heavy braking C. The front brakes under light braking D. The front brakes under heavy braking
C.
A power assist brake booster push rod that is to short will cause which of the following? a. Excessive brake drag b. Brake system to be inoperative c. Excessive brake pedal travel d. Brake light is illuminated
C.
A vehicle experiences brake squeal during brake application. Technician A says the drums may be distorted. Technician B says the backing plates may be bent. Who is right? A. A only B. B only C. Both A and B D. Neither A nor B
C.
A wheel speed sensor is being diagnosed using the OEM (original equipment manufacturer) diagnostic scan tool. Technician A says to verify wheel speed sensor operation, compare all four wheel speed sensor outputs to vehicle speed on the data list. Technician B says the wheel's direction of rotation can be verified by looking at the wheel direction on the scan tool data list. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
C.
All of these conditions may cause illumination of the red brake warning light EXCEPT: A. parking brake engagement B. low fluid level in the amster cylinder. C. an open wheel speed sensor winding. D. an accumulator pressure below 1,500 psi.
C.
All of these defects may cause a car to pull to one side while braking EXCEPT: A. wrong or loose brake pads. B. loose caliper mounting bracket. C. seized master cylinder piston. D. sticking caliper pistons.
C.
On a bearing that has been shock loaded, the race (cup) of the bearing can be dented. What is this type of bearing failure called? a. Spalling b. Arcing c. Brinelling d. Fluting
C.
On a vehicle with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This could be caused by a bad: (A) proportioning valve. (B) pressure differential valve. (C) metering valve. (D) residual check valve.
C.
Technician A says a defective wheel or axle bearing can make a growling or rumbling noise. Technician B says a defective wheel displays looseness or excessive play in the steering wheel especially while driving over rough road surfaces. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
C.
Technician A says the vacuum supply test involves inspecting the vacuum supply hose for kinks. Technician B says the test involves checking the level of vacuum supplied by the engine or vacuum pump. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
C.
The ABS (antilock brake system) and TRACTION OFF indicator lights remain ON with the engine running. Technician A says to check for ABS or TCS (traction control system) diagnostic trouble codes. Technician B says you can check for ABS or TCS blink codes by connecting two pins of the DLC (Data Link Connector). Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
C.
When adjusting the parking brakes on a vehicle equipped with rear disc brakes: A. Do nothing because the parking brakes are self-adjusting. B. There should be 0.75 in (19 mm) of slack in the cables so they don't bind during application. C. The parking brake cable should be adjusted with the parking brake on one click so there will be a slight drag in the wheels. D. The parking brake cable should be adjusted so there is 0.50 in (1.27 mm) between the stopper pin and the stop.
C.
When the brakes are applied, a vibration comes from the front of a vehicle with a disc/drum system. Which of these could be the cause? (A) Unequal tire pressure (B) Binding caliper slides (C) Excessive rotor runout (D) A frozen caliper piston
C.
Which of these would most likely happen if the measurements in the set-up shown above varied from manufacturer's specs? (A) Noisy Brake operation (B) Brake grab or pull (C) Pulsating brake pedal (D) Low brake pedal
C.
While assembling the brake shoes and related hardware: A. The secondary shoe faces toward the front of the vehicle. B. The primary and secondary shoe return springs are interchangeable. C. The adjuster must be installed in the proper direction. D. The adjuster cable usually is mounted on the primary shoe.
C.
While servicing a wheel cylinder: A. The parts should be washed in a soap and water solution. B. If the cylinder is pitted or deeply scored, hone the wheel cylinder. C. The piston cups should be lubricated with cl ean brake fluid before installation. D. During assembly, the flat side of the pistons face the brake shoe links.
C.
Mechanical Foundation System
Components (such as discs and pads or drums and shoes) that creates the friction required to stop the vehicle.
Hydraulic system
Components (such as the brake lines and master cylinder) that transfers power from the brake pedals to either disc or drum brakes.
Electronic system
Components that notify the driver of a failure in the brake system. In anti-lock brake (ABS) systems, electrical system components work to prevent tire skidding.
A hydraulic brake line is leaking. Which of these is the correct repair? (A) Cut out the bad section and replace with new steel tubing using compression fittings. (B) Replace the leaking line with double-flared seamless copper tubing. (C) Cut out the bad section and replace with single-flared steel tubing using flare nuts and unions. (D) Replace the leaking line with double-flared steel tubing.
D.
A spongy brake pedal may be caused by: a. ABS Diagnostic Trouble Code set b. Frozen caliper piston c. Defective metering valve. d. Air in hydraulic system
D.
A vehicle with disc/drum brakes requires excessive brake pedal effort to stop. The brake pedal is firm when applied. While starting the engine with the brakes applied, the pedal does not go down slightly. Technician A says excessive brake pedal freeplay could be the cause. Technician B says air trapped in the hydraulic system could be the cause. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
D.
On a car with a drum/disc system, the front brakes lock up on light pedal application. This problem could be caused by a bad: a. Residual check valve b. Proportioning valve c. Pressure differential switch d. Metering valve
D.
On a vehicle with single piston, floating caliper disc brakes, the disc brake pad between the caliper piston and the rotor is badly worn. The other brake pad is only slightly worn. Technician A says that too much rotor runout could be the cause. Technician B says that a frozen caliper piston could be the cause. Who is right? (A) A only (B) B only (C) Both A and B (D) Neither A nor B
D.
The brake pedal is low and spongy; all brake adjustments have been completed according to specifications. The cause of the problem could be: A. Binding pedal linkage. B. Dented brake line. C. Plugged compensating port. D. A weak hydraulic hose.
D.
The brakes are being bled on an older vehicle equipped with a quick take up valve in the master cylinder. Technician A says the quick take up valve must be depressed. Technician B says the brakes on this vehicle cannot be bled. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
D.
The rear brake linings are soaked with axle grease but still have a lot of lining left on them. Which is the correct way to service these brakes? a. Replace the brake linings b. Wash in hot, soapy water and dry. c. Clean with approved cleaner and reuse d. Repair leak and replace brake linings
D.
This question has the word EXCEPT. For this question, look for the choice that could NOT cause the described situation. Read the entire question carefully before choosing your answer. All of these would cause a low brake pedal, EXCEPT: a. Brake adjustment b. Loose wheel bearing c. Low brake fluid d. Seized caliper piston
D.
To test the brake warning light circuit: A. Drain the master cylinder, start the engine, and watch for the warning light to illuminate. B. Disconnect the switch, start the engine, and apply moderate brake pressure. C. Replace the switch because it may be faulty. D. Ground the warning switch wire with the ignition on.
D.
When removing the master cylinder, all of the following steps must be performed EXCEPT: A. Relieve any vacuum boost pressure (if equipped with power brakes). B. Plug the ends of the brake lines to prevent fluid loss. C. Disconnect the float level sensor. D. Drain the master cylinder.
D.
With the brakes applied on a vehicle with power brakes, the pedal moves down slightly when the engine is started. Technician A says the cause could be a leaking power brake booster diaphragm. Technician B says the cause could be a stuck closed residual check valve in the hose from the intake manifold to the power brake booster. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
D.
With the brakes applied, the pedal moves down slightly when the engine is started on a vehicle with power brakes. Technician A says that the cause could be a leaking power brake booster diaphragm. Technician B says that the cause could be a stuck closed check valve on the power brake booster manifold. Who is right? (A) A only (B) B only (C) Both A and B (D) Neither A nor B
D.
