Brakes Test 3
0.003 to 0.005 in. (0.08 to 0.13 mm)
Typical maximum rotor runout specifications are: 0.0003 to 0.0005 in. (0.008 to 0.013 mm) 0.003 to 0.005 in. (0.08 to 0.13 mm) 0.030 to 0.050 in. (0.8 to 1.3 mm) 0.300 to 0.500 in. (8.0 to 13 mm)
use a dual-servo friction type brake assembly
Rear-disc auxiliary drum type parking brakes: use a dual-servo friction type brake assembly are normally self adjusting can't be adjusted manually through a slot in the splash shield. all of the above
A) Aid cooling
Rotors are vented to: B) Increase strength D) Reduce the rotor weight C) Reduce material cost A) Aid cooling
C) Piston movement through the seal
Single-piston type disc brakes are adjusted by: C) Piston movement through the seal B) Self-adjusting mechanisms A) Torquing the guide pins D) Star wheel adjusters
Both A & B are correct
Technician A says a parking brake equalizer may consist of a cable guide attached to a threaded rod. Technician B says a brake equalizer balances the force from the parking brake control. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Technician A says heat checking can be caused by numerous panic stops in rapid succession. Technician B says it can be caused by "riding" the brake pedal. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician A only
Technician A says some disc brake pads have tapered lining edges to prevent vibration. Technician B says disc brake pad wear indicators are required by law on all new vehicles. Which technician is correct? Both A & B are correct Technician A only Neither A nor B are correct Technician B only
Neither A nor B are correct
Technician A says that a disc brake caliper hardware kit and caliper overhaul kit are actually the same parts. Technician B says that a phenolic caliper piston caliper assembly cannot be overhauled. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Technician A says that a hose clamp can be used to compress the retainer fingers of a parking brake cable in order to remove it from the backing plate. Technician B says a box-end wrench can be used instead of a hose clamp. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Technician A says that a lack of lubrication on the back of the disc brake pads can cause brake noise. Technician B says that pads that are not correctly crimped to the caliper housing can cause brake noise. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
Technician A says that a loaded caliper includes an overhauled caliper assembly but no brake pads or hardware. Technician B says that a loaded caliper includes the pads and all needed hardware. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
smoother its friction surface is.
The lower the Ra of a rotor, the: smoother its friction surface is. rougher its friction surface is. better its cooling ability is. higher its coefficient of friction is.
E. All of the above
The parking brake performance test must be performed with: A. the vehicle facing uphill B. the vehicle facing downhill C. less than 100lbs of force applied to the parking brake pedal D. Only A & B E. All of the above
Technician B only
The piston is being retracted in a caliper with an integral parking brake mechanism. Technician A says to remove the parking brake lever and push the piston back with a c-clamp. Technician B says a special tool that turns the piston while applying pressure to it may be needed to retract the piston. Who is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
Two technicians are discussing disc brake rotor service. Technician A says that the inner races (bearing cups) should be removed from the rotor before it is mounted on the lathe. Technician B says that a non-directional finish on the rotor surfaces can be obtained by using sandpaper. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Two technicians are discussing parking brake systems that mechanically actuate the rear disc brake caliper. Technician A says that the calipers are self-adjusting. Technician B says that the actuating cables are adjustable at the equalizer. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Neither A nor B are correct
Two technicians are discussing the construction of a single piston caliper. Technician A says that the fluid is retained by a piston seal fitted in a groove machined in the piston. Technician B says that the piston is held in the caliper by a lock ring. Which technician is correct? Technician B only Both A & B are correct Technician A only Neither A nor B are correct
Technician A only
Two technicians are discussing the machining of brake drums. Technician A says that most brake drums cannot be machined more than 0.060 in. oversize. Technician B says that brake drums on a common axle should be machined to within 0.035 in. of each other. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Two technicians are discussing the reason that the brake fluid level in the master cylinder drops. Technician A says that it may be normal due to the wear of the disc brake pads. Technician B says that a low brake fluid level may indicate a hydraulic leak somewhere in the system. Which technician is correct? Both A & B are correct Neither A nor B are correct Technician B only Technician A only
Technician A only
Two technicians are discussing ways of removing a caliper piston. Technician A says to use compressed air. Technician B says to use large pliers. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
D. Only A & B
Before returning the vehicle to the customer after new front disc pads have been installed: A. The vehicle should be test driven B. The brake pads should be burnished following the pad manufacturers procedures C. The brake pads should be seated by repeated high speed stops D. Only A & B E. All of the above
Rear brake shoes
If the parking brake will not hold on a hill or requires excessive lever movement always check and adjust the ________ first, before adjusting the parking brake cable. Rear brake shoes Parking brake intermediate lever Parking brake lever Parking brake equalizer
D. Both A & B are correct
In an integral rear disc brake caliper, the parking brake cable moves a lever that can: A. rotate an operating shaft, causing ramp actuated balls to apply pressure to the caliper piston. B. turn an acuating screw driven nut in a clutch type cone positioned in the caliper piston. C. directly slide the caliper toward the abutment mechanically applying the disc pads. D. Both A & B are correct E. All of the above are correct
Dial Indicator
Lateral rotor runout is measured with a: Dial Vernier Calipers Dial Indicator Rotor Micrometer Vernier Micrometer
D. Only A & B
Machining of a rotor is performed to: A. Remove scoring B. Remove surface runnout C. Remove hard spots D. Only A & B E. All of the above
Pushing a spring loaded button
Manual parking hand brake levers may be released by: An electric servo Hydraulic pressure A vacuum servo Pushing a spring loaded button
Turning a starwheel
Most auxiliary drum type parking brakes are adjusted by: Adjusting the parking brake cables Turning a starwheel Adjusting the service brakes Turning a wingnut
toward the primary brake shoe
On most vehicles with integral drum type parking brakes, the anti-rattle spring (strut spring) should be installed on the parking brake strut: toward the primary brake shoe toward the secondary brake shoe between the strut and the shoe park brake lever between the strut and the backing plate
D) They are self-energizing
Disc brakes have many advantages, some of which are listed below. Which of the following statements does NOT apply to disc brakes? C) They dissipate heat faster D) They are self-energizing A) They are self-cleaning B) They resist fading
B) Used on high performance vehicles
Four-piston disc brake calipers are generally: C) Not as strong and powerful as single-piston calipers A) Cheaper than single-piston calipers D) More commonly used than single-piston calipers B) Used on high performance vehicles
Bleeder valve will be in the wrong position
Although some calipers will fit either side of a vehicle, they should not be interchanged because the: Disc pads must be reversed Dust boots may not seal properly Bleeder valve will be in the wrong position Pistons move in opposite direction
Technician A only
A "chirping" noise is heard while the vehicle is moving forward, but stops when the brakes are applied. Technician A says that the noise is likely caused by the disc brake pad wear indicators. Technician B says the noise is likely a wheel bearing because the noise stops when the brakes are applied. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
A disc brake rotor is being installed on a lathe for machining. During the setup a scratch test is performed. The scratch extended all the way around the rotor. Technician A says that the rotor should be loosened, rotated 180 degrees, and retightened. Technician B says that the rotor is not warped. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Using the parking brake to stop
A pedal pulsation condition can be isolated to the front or rear brakes by: Four hard stops Rotating the tires Spinning each wheel by hand to feel for pulsations Using the parking brake to stop
D) Low-drag caliper
A quick take-up master cylinder is required when what type of caliper design is used on a vehicle? C) Two-piston caliper B) Sliding caliper A) Fixed caliper D) Low-drag caliper
Technician B only
A rear drum brake is being inspected. The primary shoe is not contacting the anchor pin at the top. Technician A says that this is normal. Technician B says that the parking brake cable may be adjusted too tight or is stuck. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Square-cut O-ring seal and dust boot
A typical disc brake caliper overhaul (OH) kit usually includes what parts? Dust boot, return spring, and caliper seal Replacement caliper piston and dust boot Disc brake pad clips, dust boot, and caliper piston assembly Square-cut O-ring seal and dust boot
Both A & B are correct
A vehicle is hoisted during routine service and the service technician discovers that the left front wheel does not turn when force is applied. Technician A says that the hoist (lift) pads could be against the left front tire. Technician B says that there could be a brake fluid restriction between the master cylinder and the brake caliper. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
All of the above will cause brake pull.
A vehicle pulls to one side when braking. This could be caused by all of these EXCEPT: Faulty suspension parts Restricted brake hose Unequal tire pressures Stuck caliper piston All of the above will cause brake pull.
C. Weighing
A vehicle with carbon-ceramic rotors is being inspected. Servicing these rotors includes ________ the rotors. A. Machining B. Cross hatching the friction surface C. Weighing D. Only A & B E. All of the above
Normal operation
After a disc brake pad replacement, the brake pedal went to the floor the first time the brake pedal was depressed. The most likely cause was: Air in the lines Normal operation Lack of proper lubrication of the caliper slides Improper disc brake pad installation
Technician B only
Technician A says that a steel piston should be cleaned with sandpaper to remove rust. Technician B says that brake assembly fluid or clean brake fluid should be used to lubricate the caliper pistons before installing in the caliper. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
Technician A says that a steel piston should have a greater piston-to-caliper bore clearance than a phenolic piston because the steel piston will expand when the brake fluid temperature increases during normal braking. Technician B says that the phenolic piston should have the greater clearance. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Technician A says that all metal-to-metal contact areas of the disc brake system should be lubricated with special brake grease for proper operation. Technician B says that the lubrication helps reduce brake noise (squeal). Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are Correct
Technician A only
Technician A says that all slides and caliper bushings should be lubricated for proper operation. Technician B says that lubricant should not be used on disc brake parts because it can trap and hold dirt. Which technician is correct? Technician A only Neither A nor B are correct Technician B only Both A & B are correct
Neither A nor B are correct
Technician A says that all vehicles equipped with rear disc brakes use a parking brake that is integrated in the caliper. Technician B says that all vehicles equipped with rear disc brakes use a small drum brake inside the rear rotor for a parking brake. Which technician is correct? Both A & B are correct Technician A only Technician B only Neither A nor B are correct
Both A & B are correct
Technician A says that an electric parking brake (EPB) uses an electric motor to pull on the parking brake cable. Technician B says that some electric parking brake systems use a computer controlled motor attached to the caliper. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician A only
Technician A says that brake drums on the same axle should be close to the same inside diameter for best brake balance. Technician B says that a brake drum may be cracked if it rings like a bell when tapped with a light steel hammer. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
Technician A says that disc brake pads with riveted linings should be replaced when worn to 1/8" above the rivets. Technician B says the pads should be removed and inspected whenever there is a brake performance complaint. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
Technician A says that hard spots in a brake drum should be removed using a carbide-tip machining tool. Technician B says that the drum should be replaced if hard spots are discovered. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Both A & B are correct
Technician A says that riveted disc brake pads are often quieter that bonded disc brake pads. Technician B says that integrally molded disc brake pads are molded into holes in the steel backing of the pads. Which technician is correct? Technician A only Neither A nor B are correct Both A & B are correct Technician B only
Both A & B are correct
Technician A says that rotor thickness variation is a major cause of a pulsating brake pedal. Technician B says that at least 0.015 in. (0.4 mm) should be left on a rotor after machining to allow for wear. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Technician B only
Technician A says that the parking brake cable should be adjusted at each wheel. Technician B says that the parking brake cable adjustment is usually done after adjusting the rear brakes. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Neither A nor B are correct
Technician A says that while rotors can be machined while still installed on the vehicle, it is more accurate to remove them and machine them on a brake lathe. Technician B says that the drums can be machined while still installed on the vehicle. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Neither A nor B are correct
Technician A says the parking brake cable adjustment should be performed before adjusting the rear brakes. Technician B says the parking brake cable should allow for about 15 "clicks" before the parking brake holds. Which technician is correct? Technician A only Technician B only Both A & B are correct Neither A nor B are correct
Maximum allowable inside diameter
The chamfer on the inside edge of a brake drum usually indicates: Aluminum drum with cast iron inset Machine to diameter Bi-metallic drums (1/2 cast iron and 1/2 steel) Maximum allowable inside diameter
Remove some fluid from the master cylinder reservoir
The first step in brake pad replacement is: Remove the pad retaining pins Swing the caliper away from the anchor plate and support with an S hook Raise the car Remove some fluid from the master cylinder reservoir
0.0003 to 0.0005 in. (0.008 to 0.013 mm)
Typical maximum rotor thickness variation (parallelism) specifications are: 0.00003 to 0.00005 in. (0.0008 to 0.0013 mm) 0.0003 to 0.0005 in. (0.008 to 0.013 mm) 0.003 to 0.005 in. (0.08 to 0.13 mm) 0.030 to 0.050 in. (0.8 to 1.3 mm)
Silencer band
Using a ________ when turning a drum prevents tool chatter. High speed Positive rake cutting tool Negative rake cutting tool Silencer band
E) Both A & B are correct
When the pressure in a disc brake caliper is released, the piston is moved back in the cylinder by: B) The action of the piston seal A) Rotor runnout C) The leverage of the caliper arms D) Spring pressure E) Both A & B are correct
B) Ceramic
Which disc brake pad friction lining compound is MOST likely to cause excessive rotor wear? D) Carbon fiber (CFRC) B) Ceramic A) Non asbestos organic C) Semimetallic
A) They require a more complex hydraulic system with special valves.
Which is NOT true of rear disc brakes? A) They require a more complex hydraulic system with special valves. C) They may use a one-piece rotor with parking brake drum D) They have Relatively poor parking brake performance B) They are costly and complex
All of the above are types of drum distortions
Which of these is NOT a form of drum distortion? Bellmouthed Out-of-Round Eccentric Barrel Shaped All of the above are types of drum distortions
