A5 Brakes (ASE Style Questions #1)

On a car with disc/drum brakes, the front brakes grab quickly when light pedal pressure is applied. This problem could be cause by a bad:

• Proportioning valve

• Pressure safety valve

• Metering valve

• Residual check valve

The driver of a vehicle with power disc/drum brakes says the brake pedal moves slowly to the floor while maintaining pedal pressure at a stoplight. What could cause this problem?

• Leaking primary piston cup in master cylinder

• Leaking power brake booster

• Leaking residual check valve in master cylinder

• Internal leak in the combination valve

Which of the following would MOST LIKELY happen if the measurements taken from the check shown above varied from the manufacturer's specifications?

• Noisy brake operation

• Brake grab or pull

• Pulsating brake pedal

• Low brake pedal

What is the purpose of the master cylinder residual check valve(s) on vehicles equipped with drum brakes?

• Allows the driver to pump up the brakes

• Prevents air from entering the hydraulic system

• Prevents wheel lockup by reducing the hydraulic pressure

• Reduces pedal pulsation by controlling hydraulic pressure

A technician has just overhauled the front brakes on a vehicle with front disc and rear drum brakes. However, when he attaches a pressure bleeder (pressurized to about 25 psi) to the master cylinder, he cannot get any fluid to come out of the disc brake caliper bleeder screws. Which of the following is MOST LIKELY the cause?

• Bad proportioning valve

• Bad pressure differential valve

• Proportioning valve release button not activated

• Metering valve release button not activated

On a vehicle with single piston floating caliper front disc brakes, the brake pads on the left side on the vehicle are almost completely worn while the right side is almost new. Technician A says that too much rotor runout could be the cause. Technician B says that a binding caliper piston could be the cause. Who is right?

• Technician A only

• Technician B only

• Both A and B

• Neither A nor B

What is the purpose of the bar that is being removed from the brake assembly shown below?

• To equalize the braking force between the shoes during normal braking

• To center the shoes after each brake application

• To force the shoes into the drum when the parking brakes are applied

• To reduce the distance between the shoes and the drum

A hydraulic brake line is leaking. Which of the following is the correct repair procedure?

• Cut out the bad section and replace with new steel tubing using compression fittings

• Replace the leaking line with double-flared, seamless copper tubing

• Cut out the bad section and replace with single-flared steel tubing using flare nuts and unions

• Replace the leaking line with double-flared steel tubing

The set-up shown above is used to check:

• Rotor parallelism

• Wheel bearing adjustment

• Rotor lateral runout

• Rotor face wear

Which of the following problems would be caused by using a residual check valve in a disc brake master cylinder?

• Reduced brake pedal travel

• Reduced brake system pressure

• Increased brake pad wear

• Increased rotor runout