AUTI-224- Chapter 8 Test
The proper operation of a vacuum brake booster requires that the engine be capable of supplying at least: 22 in. Hg vacuum. 28 in. Hg vacuum. 16 in. Hg vacuum. 10 in. Hg vacuum.
16 in. Hg vacuum.
The booster receives approximately ____ of vacuum from the intake manifold. 15" 10" 25" 20"
20"
Vacuum boosters consist of all of the following components EXCEPT _________. A combination valve One or two sealed diaphragms An outer housing A diaphragm return spring
A combination valve
Should pressure in the hydraulic system be lost, such as when the engine stalls or the power steering pump drive belt breaks, the hydraulic booster systems accumulator is designed to store sufficient pressure to provide for ______ full-power application(s). Unlimited Many One A few
A few
As a safety measure, part of the hydraulic booster system includes a(n) _______, which assists in maintaining a reserve of system pressure. Fluid reservoir Accumulator Brake reserve light Power steering pump
Accumulator
With the engine running, the check valve allows _____ to be evacuated from the booster, but not to return. Air Fluid Pressure None of the above
Air
To keep the surface area of the diaphragm plate large enough to provide the needed boost, two smaller diaphragms in tandem are used, one _______ the other. On top of Located diagonally from To the left of Directly behind
Directly behind
If the brake pedal doesn't hold pressure, there are no substantial leaks in the system. True False
False
The booster chambers are separated by a _______ diaphragm attached to the diaphragm plate. Flexible silicon Rigid steel Rigid plastic Flexible rubber
Flexible rubber
Power brake units on _______ engines use the vacuum produced in the intake manifold to power the brake booster. Diesel Hybrid Gasoline All of the above
Gasoline
Testing the operation of the electrohydraulic braking system is just like testing the___________. Hydraulic booster system Brake light warning system Vacuum booster system Electronic brake proportioning system
Hydraulic booster system
The vacuum-assisted power booster uses the difference between engine vacuum and atmospheric pressure to ______ the force that acts on the master cylinder pistons. Stabilize Equalize Decrease Increase
Increase
Excessive vacuum is _______ a problem because the booster is designed to work using maximum engine vacuum. Never Frequently Not usually Always
Not usually
If issues are found, follow the manufacturers recommended procedure to diagnose the fault. True False
True
The power booster can be operated by engine vacuum or through hydraulic pressure, which is usually generated by the power steering pump or an electric-driven pump. True False
True
