Brakes test 3 and 4
Typical maximum rotor thickness variation (parallelism) specifications are _____. 0.0003 to 0.0005 inch (0.008 to 0.013 mm) 0.003 to 0.005 inch (0.08 to 0.13 mm) 0.030 to 0.050 inch (0.8 to 1.3 mm) 0.300 to 0.500 inch (8.0 to 13 mm)
0.0003 to 0.0005 inch (0.008 to 0.013 mm)
Typical maximum rotor runout specifications are ______. 0.0003 to 0.0005 inch (0.008 to 0.013 mm) 0.003 to 0.005 inch (0.08 to 0.13 mm) 0.030 to 0.050 inch (0.8 to 1.3 mm) 0.300 to 0.500 inch (8.0 to 13 mm)
0.003 to 0.005 inch (0.08 to 0.13 mm)
The proper operation of a vacuum brake booster requires that the engine be capable of supplying at least ______. 21 in Hg vacuum 15 in. Hg vacuum 17 in. Hg vacuum 19 in. Hg vaccum
15 in. Hg vacuum
The rear brakes should be inspected, and adjusted if necessary, if the parking brake requires more than _____. 5 clicks 10 clicks 15 clicks 20 clicks
5 clicks
Most wheel speed sensors should measure how much resistance? 800 to 2,500 ohms 100 to 300 ohms 1 to 3 ohms 0.1 to 1 ohm
800 to 2,500 ohms
The first step in diagnosing a Hydro-boost problem is ______. To tighten the power steering drive belt A thorough visual inspection A pressure test of the pump A volume test of the pump
A thorough visual inspection
In a typical integral rear disc brake caliper, the parking brake cable moves the ____. Caliper Actuator screw Auxiliary piston Rotor
Actuator screw
Antilock brakes cannot defy the laws of physics under what conditions? When a vehicle enters a corner traveling faster that it is physically possible to negotiate the turn If the brakes are applied to late to bring the vehicle to a complete stop before impact be able to stop the vehicle in a short distance under all conditions All of the above
All of the above
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. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that ABS brakes are designed to allow the front wheel to be steered during heavy braking. Technician B says that the ABS dash warning lamp is amber. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that a breakout box is sometimes required to diagnose an older antilock brake system. Technician B says that a breakout box requires the use of a digital multimeter. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
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 technicians Neither technician
Both technicians
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 technicians Neither technician
Both technicians
Technician A says that aluminum brake drums use cast-iron friction surfaces. Technician B says that up to 0.030 inch (0.8 mm) should be left after machining a drum to allow for wear. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
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 technicians Neither technician
Both technicians
Technician A says that disc brake pads should be replaced when worn to minimum allowable thickness. 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 technicians Neither technician
Both technicians
Technician A says that disc brakes are self adjusting and the brake pedal height should not become lower as the disc brake pads wear. Technician B says that as the disc brake pads wear, the level of brake fluid in the master cylinder reservoir drops. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that most ABS units are nonintegral. Technician B says that he ABS is disable (does not function) below about 5 mph (8 km/h). Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
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 Technician B only Both technicians Neither technician
Both technicians
Technician A says that the ABS electrohydraulic unit can be bled using bleeder screws and the manual method. Technician B says that a scan tool is often required to bleed the ABS electrohydraulic unit. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that the parking brake hand lever can turn on the red brake warning lamp. Technician B says that a foot-operated parking brake can turn on the red brake warning lamp. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
Technician A says that to check the operation of a vacuum brake booster, the brake pedal should be depressed until the assist is depleted and then start the engine. Technician B says that the brake pedal should drop when the engine starts, if the booster is okay. Which technician is correct? Technician B only Both technicians Technician A only Neither technician
Both technicians
The red brake warning lamp is on and the amber ABS lamp is off. Technician A says that a fault is possible in the base brake system. Technician B says that the red brake warning lamp can be turned on by a low brake fluid level in the master cylinder. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Both technicians
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? Technician A only Technician B only Both technicians Neither technician
Both technicians
Uneven disc brake pad wear is being discussed. Technician A says the caliper piston may be stuck. Technician B says the caliper may be stuck on the slides and unable to "float". Which technician is correct? Technician A only Technician B only Both technicians Neither Technician
Both technicians
The outboard shoe of a single piston caliper is pushed against the rotor by the ________. Push rod Piston Caliper body Caliper mounting
Caliper body
What type of scan tool is unlikely to provide data from the antilock brake system (ABS)? Tech 2 Snap-on Solus Code reader OTC Genisys
Code reader
Anti-rattle spring clips are used to ________. Dampen vibrations Allow the pads to move around Help quiet drum brake noise Adjust brake pad clearance
Dampen vibrations
An active wheel speed sensor is also referred to as _____ Variable reluctance (VR) Hall-effect Magneto resistive (MR) Either b or c
Either b or c [Hall-effect Magneto resistive (MR)]
Disc brake design incorporates servo action. True False
False
If the engine stops running, the Hydro-Boost will not be able to provide any power assist for the brakes. True False
False
A cracked tone (reluctor) ring will often cause what type of problem? The antilock breaksystme will be disabled and the amber ABS warning lamp will be on False ABS actuation at low speed A brake failure which will turn on the red brake warning light The affected wheel brake will be applied all of the time
False ABS actuation at low speed
Which type of anitlock brake system (ABS) requires the use of four wheel speed sensors? One channel Two channel Three channel Four channel
Four channel
The ABS controller uses what signal characteristic from a wheel speed sensor? Voltage Frequency Resistance Electromagnetic
Frequency
On most vehicles, the antirattle spring (strut spring) should be installed on the parking brake strut toward the ____ of the vehicle Front Rear No answer text provided.
Front
A defective vacuum brake booster will cause a ______. Hard brake pedal Soft (spongy) brake pedal Low brake pedal Slight hiss noise when the brake pedal is depressed
Hard brake pedal
A quick take-up master cylinder is required when what type of caliper design is used on a vehicle? Fixed Two-piston Sliding Low-drag
Low-drag
Rotor finish is measure in ______. Millimeters Inches Microinches Centimeters
Microinches
A brake pedal feels spongy when depressed. Technician A says that a defective hydraulic brake booster could be the cause. Technician B says that a defective vacuum brake booster could be the cause. Which technician is correct? Technician B only Both technicians Neither technician Technician A only
Neither technician
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? Technician A only Technician B only Both technicians Neither technician
Neither technician
On most drum brake systems, the parking brake lever and strut transfer the pulling force of the parking brake cable against the _______. Primary shoe Secondary shoe No answer text provided. No answer text provided.
Primary shoe
An accumulator such as that used on hydraulic brake boosters ______. Reduces brake pedal noise Provides a reserve in the event of a failure Woks against engine vacuum Provides higher force being fed back to the driver's foot
Provides a reserve in the event of a failure
Brake pedal feedback to the driver is provided by the _____. Charcoal filter unit Reaction system Vaccum check-valve operation Vacuum diaphragm
Reaction system
Slots are often used in brake pads because they ________. Reduce brake noise Increase brake life Reduce brake fade Improve braking performance
Reduce brake noise
The maximum traction between a tire and the road occurs when the tire is _____. Locked and skidding Rotating freely Slipping 10% to 20% Slipping 80% to 90%
Slipping 10% to 20%
The lower the Ra of a rotor, the _______ the surface. Smoother Rougher Higher Lower
Smoother
A typical disc brake caliper overhaul (OH) kit usually includes what parts? Square-cut O-ring seal and dust boot Replacement caliper piston and dust boot Dust boot, return spring, and caliper seal Disc brake pad clips, dust boot, and caliper piston assembly
Square-cut O-ring seal and dust boot
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 sensors. 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 technicians Neither technician
Technician A only
Technician A says some brake pads have tapered edges to prevent vibration. Technician B says pad wear indicators are required by law on all new vehicles. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
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 technicians Neither technician
Technician A only
Technician A says that if the parking brake cable is adjusted too tight, the rear brakes may drag and overheat. Technician B says that the parking brake is adjusted properly if the cable is tight when in the released position. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Technician A says that the ABS may not result in shorter stopping distance compared to brakes without ABS. Technician B says that a pulsating brake pedal during normal braking is a characteristic feature of most ABS equipped vehicles. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Technician A says that using the space-saving small spare tire may trigger an ABS amber warning lamp. Technician B says the use of the small spare tire may trigger the red brake warning lamp. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Two technician are discussing ABS wheel speed sensors. Technician A says that some ABS use a sensor located in the rear-axle pinon gear area. Technician B says that all ABS use a wheel speed sensor at each wheel. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Two technician are discussing passive-type wheel speed sensors. Technician A says that wheel speed sensors are magnetic. Technician B says that the toothed sensor ring is magnetic. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician A only
Two technician 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 technicians Neither technician
Technician A 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∘ and retightened. Technician B says that the rotor is not warped. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
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 tuck. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
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 need hardware. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
Technician B only
Technician A says that a steel piston should be cleaned with sandpaper to remove rust. Technician B says that the brake assembly fluid or clean brake fluid should be used to lubricate the caliper pistons before installing the caliper. which technician is correct? Technician A only Technician B only Both technicians Neither technician
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 replace if hard spots are discovered. Which technician is correct? Technician A only Technician B only Both technicians Neither technician
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 technicians Neither technician
Technician B only
Two technician are discussing vacuum brake boosters. Technician A says that a low, soft brake pedal is an indication of a defective booster. Technician B says that there should be at least two power-assisted brake applications after the engine stops running. Which technician is correct? Neither technician Both technicians Technician B only Technician A only
Technician B only
When the pressure in a caliper is released, the piston is moved back in the cylinder by ________. Spring pressure The action of the piston seal The leverage of the caliper arms The opening of the vent port
The action of the piston seal
Mechanical fade is NOT a problem with disc brakes because ________. Disc brake use power boosters The brake rotor expands toward the brake linings as it heats up Disc brakes have a relatively small swept area Disc brake pads have a lower friction coefficient
The brake rotor expands toward the brake linings as it heats up
A passive-type wheel speed sensor (WSS) is being checked for the proper resistance which should be 800-2,500 ohms. The meter reads 1.1KΩ. This means _____. The sensor has a normal resistance reading The sensor is electrically shorted The sensor is electrically open The sensor is grounded
The sensor has a normal resistance reading
Disc brakes have many advantages, some of which are listed below. Which of the following statements does NOT apply to disc brakes? They are self-cleaning They are self-energizing They dissipate heat faster They resist fading
They are self-energizing
The purpose of the charcoal filter in the vacuum hose between the engine and the vacuum brake booster is to ________. Direct the vacuum Act as a one-way check valve to help keep a vacuum reserve in the booster Trap gasoline vapors to keep them form entering the booster Filter the air entering the engine
Trap gasoline vapors to keep them form entering the booster
A floating or sliding caliper must move when the brakes are reapplied. True False
True
Brake pads may have slots or holes to help prevent gas fade. True False
True
The major reason for brake pedal pulsation during braking is due to excessive rotor thickness variation. True False
True
A passive wheel speed sensor is also referred to as ______ Variable reluctance (VR) Magnetic Magneto resistive (MR) Either a or b
Variable reluctance (VR)
Which is not a recommended type of grease to use on brake parts? Silicone grease Wheel bearing (chassis) grease Synthetic grease Antiseize compound
Wheel bearing (chassis) grease
Which part of an anitlock brake system is used for tire pressure monitoring? Hydraulic control module Wheel speed sensors Yaw sensor Brake pedal position (BPP) sensor
Wheel speed sensors
