Power Brakes Flashcards
The two most common types of power brake booster are the….
Vacuum booster and Hydraulic booster
The amount of power assist a vacuum-operated brake booster can produce depends on:
a) the surface area of the diaphragm
b) the amount of pressure differential
c) both a and b
d) neither a nor b
c) both a and b
The 2 most common types of brake boosters in use today are:
a) vacuum and duo serve
b) vacuum and electro-hydraulic
c) vacuum and hydraulic
d) electro-hydraulic and hydraulic
c) vacuum and hydraulic
A vehicle equipped with power brakes will have:
a) larger brake rotors and drums than a non-power-brake vehicle
b) metallic brake pads and shoes
c) a larger stopping surface at the wheel brakes than a non-power brake vehicle
d) the same foundation brakes as a non-power brake vehicle
d) the same foundation brakes as non-power brake vehicle
The two control valves in a vacuum brake booster are the:
a) air chamber valve and the vacuum chamber valve
b) pressure differential valve and check valve
c) vacuum valve and atmospheric valve
d) none of the above are correct
c) vacuum valve and atmospheric valve
In the vacuum-power brake booster, what returns the diaphragm to the released position when the driver has released the brakes?
a) the return spring
b) pressure differential
c) vacuum and atmospheric pressure
d) diaphragm recoil spring
a) the return spring
What component in the vacuum brake booster ensures that vacuum does not escape the booster when the engine is turned off?
a) vacuum control valve
b) check valve
c) diaphragm return spring
d) atmospheric valve
b) check valve
On vehicles equipped with diesel engines or vehicles that do not produce enough vacuum to operate vacuum boosters, manufacturers use:
a) electro-hydraulic boosters
b) atmospheric suspend boosters
c) basic foundation brakes
d) a vacuum pump
d) a vacuum pump
Vacuum boosters operate in three stages or positions:
a) parked, driving and stopped
b) released, applied and holding
c) at rest, released and applied
d) unapplied, applied and partially applied
b) released, applied and holding
The control valves in a vacuum brake booster during the applied position will:
a) both be closed
b) both be open
c) have the vacuum valve open and atmospheric valve closed
d) have the atmospheric valve open and vacuum valve closed
d) have the atmospheric valve open and vacuum valve closed
The control valves in a vacuum brake booster in the hold position will:
a) both be closed
b) both be open
c) have the vacuum valve open and atmospheric valve closed
d) have the atmospheric valve open and vacuum valve closed
a) both be closed
A vehicle equipped with a hydraulic brake booster uses power steering fluid under pressure to:
a) operate the power steering system
b) operate the power brake booster
c) supply pressure to the booster diaphragm
d) both a and b
d) both a and b
The accumulator in a hydraulic brake booster will:
a) supply enough pressurized fluid for at least two assisted stops
b) act as a reservoir to provide back-up pressure
c) contain a very strong spring or compressed nitrogen gas
d) do all of the above
d) do all of the above
The spool valve in a hydraulic brake booster in the applied position will:
a) direct fluid pressure into the pressure chamber
b) allow fluid to exert pressure on the apply piston
c) open the apply valve and port
d) move forward enough to restrict the exhaust port
a) direct fluid pressure into the pressure chamber
When diagnosing a vacuum brake booster the three tests it must pass are the:
a) at rest, applied and hold
b) function, unapplied leakage and applied leakage
c) driving, stopping and accelerating
d) operating, holding and decelerating
b) function, unapplied leakage and applied leakage
