Mr. Cruz Maxwell High School Brakes 1 ASE Test Prep

A vehicle with a vacuum brake booster has a hard pedal with little stopping power. Technician A says a kink in the check valve's hose will result in this condition. Technician B says a vacuum booster needs at least 12 Hg of vacuum to operate properly. Who is correct?

• Technician A only
• Technician B only
• Both Technician A and B
• Neither Technician A nor B

A vehicle has a low spongy brake pedal. Which of these is LEAST likely to result in this condition?

• Loose wheel bearings.
• Contgamintaetd Brake Fluid
• Worn Brake pads.
• Air in the hydraulic system.

Technician A says passive permanent magnet ABS wheel speed sensors produce an A/C voltage signal. Technician B says input from wheel speed sensors are used for anti-lock brake, electronic traction control, and electronic stability control systems. Who is correct?

• Technician A only
• Technician B only
• Both Technician A and B
• Neither Technician A nor 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 MOST likely the cause of this condition?

• A blocked master sylinder replenishing port.
• A blocked mater cylinder vent port.
• Worn master cylinder cup seals.
• Low intake manifold vacuum.

A vehicle suffers from uneven pad wear. Technician A says to check for sticking slide pins. Technician B says this could be caused by a sticking caliper piston. Who is correct?

• Technician A only
• Technician B only
• Both Technician A and B
• Neither Technician A nor B

A vehicle's right front wheel has a growl that increases with vehicle speed. The MOST likely cause is:

• Excessive rotor lateral run-out.
• Warped rear brake drums.
• Worn CV-joint.
• Worn wheel bearing.

Two technicians are discussing master cylinder residual check valves. Technician A says the check valve is used on four wheel disc brake systems. Technician B says the valve maintains pressure when the brakes are released. Who is correct?

• Technician A only
• Technician B only
• Both Technician A and B
• Neither Technician A nor B

The brake pad wear indicator light is illuminated on the instrument panel. Technician A says this is because the brake pads have become contaminated. Technician B says this is the pad wear sensor contacting the brake rotor. Who is correct?

• Technician A only
• Technician B only
• Both Technician A and B
• Neither Technician A nor B

A vehicle with ABS anti-lock brakes has an audible clicking noise when it is first started. The noise goes away after a few seconds. Technician A says this is one of the hydraulic valves in the hydraulic valve assembly sticking. Technician B says this is a normal condition. Who is correct?

• Technician A only
• Technician B only
• Both Technician A and B
• Neither Technician A nor B

The rear wheels of a vehicle are locking up only when the brakes are applied. This is caused by a faulty:

• Metering valve.
• Pressure differential switch.
• Proportioning valve.
• Brake switch.