JH. Automotive Tech. 7th Edition Chapter 104 Quiz B

What is the atmospheric pressure at sea level?

• 14.7 PSI

• 15 PSI

• 13.7 PSI

• 16 PSI

What is the result of a vacuum on both sides of the power piston in a vacuum brake booster?

• The piston moves forward.

• The piston moves backward.

• The piston is held against the rear of the housing.

• The piston is released from the housing.

What happens to the air valve in the released position (brake pedal up) of a vacuum brake booster?

• It opens the air passage.

• It is seated on the floating control valve.

• It allows atmospheric pressure on both sides of the diaphragm.

• It activates the pressure differential.

What is the function of the check valve in a vacuum brake booster?

• To maintain vacuum in the booster.

• To release vacuum during brake application.

• To filter the air entering the booster.

• To equalize pressure on both sides of the diaphragm.

What is the role of the power-piston return spring in a vacuum brake booster?

• To push the piston forward during brake application.

• To hold the piston against the reaction retainer.

• To push the piston back when the brakes are released.

• To maintain pressure differential.

What is indicated by a low, soft brake pedal according to the chapter?

• Air trapped in the hydraulic system.

• Proper booster function.

• A need for brake fluid refill.

• An engaged parking brake.

How many power-assisted brake applications should there be after the engine stops running?

• At least one.

• At least two.

• At least three.

• None.

What is the reaction of the brake pedal during a vacuum booster operation test with proper vacuum?

• The pedal should remain firm.

• The pedal should rise.

• The pedal should lock.

• The pedal should drop.

What is the expected behavior of the brake pedal in a vehicle equipped with a brake assist system during a panic stop?

• The pedal should become harder to press.

• The pedal should assist in applying maximum force.

• The pedal should disengage the brakes.

• The pedal should adjust the brake fluid pressure.

What is the function of the atmospheric valve in a vacuum brake booster?

• To store excess vacuum.

• To assist in brake fluid circulation.

• To provide an opening for atmospheric pressure during brake application.

• To filter contaminants from the vacuum.