Hydraulic System Components Flashcards
An advantage of using a tandem master cylinder is that:
a) the vehicle will stop twice as fast
b) the tandem cylinder makes the system leak proof
c) it is safer, a fault in one circuit will not cause a complete failure
d) all of the above apply
c) it is safer, a fault in one circuit will not cause a complete failure
In the released position, the master cylinder primary cup is located:
a) in front of the vent port
b) between the vent and replenishing ports
c) behind the replenishing port
d) in none of the above positions
b) between the vent and the replenishing ports
Primary cup to vent port clearance should be:
a) 0.10 mm per 25mm (0.004” per 1 in) of bore
b) checked to prevent brake drag
c) adjusted as drum brakes wear
d) zero on disc brakes
b) checked to prevent brake drag
Disc brake calipers do not have return springs behind the pistons because:
a) the spring is on the pad instead
b) they would cause brake drag
c) the lathe cut seal performs this function
d) both b and c are correct
d) both b and c are correct
Cracked flex hoses can be services in which of the following ways?
a) repaired be a certified hydraulic shop
b) cutting and splicing in a new flex line
c) replacing the hose with a new assembly
d) wrapping the hose with protective rubberized tape.
c) replacing the hose with a new assembly
Which of the following statements is true of fixed calipers?
a) they may not need to be removed to replace the brake pads
b) they have more potential leak points than floating calipers
c) they always have pistons in pairs
d) all of the above are true
d) all of the above are true
When used, a proportioning valve is installed in the line to the rear drum brakes in order to:
a) reduce pressure under light applications
b) reduce pressure under medium and heavy applications
c) increase pressure under light application
d) prevent premature rear wheel lock-up
d) prevent premature rear wheel lock-up
Select one accurate statement from the following:
a) brass fittings must be used when splicing steel brake lines
b) the only flare styles permitted for steel brake lines are ISO and SAE flares
c) minor cracks in the outer casing of a flexible brake line are not cause for replacement of the line
d) steel brake line should be cut using a hacksaw blade with the largest number of teeth per inch possible.
b) the only flare styles permitted for steel brake lines are ISO and SAE flares.
A metering valve is used in the line supplying pressure to the front disc brakes in order to:
a) prevent disc brake lock-up
b) prevent drum brake lock-up
c) assist in early disc brake application
d) delay disc brake application slightly
d) delay disc brake application slightly
The pressure differential valve is used to:
a) close a switch when there is a pressure difference
b) divert more fluid to the disc brakes
c) prevent premature brake lock-up
d) create a pressure difference between the primary and secondary
a) close a switch when there is a pressure difference
When forming steel brake lines to fit on a vehicle it is ok to bend the lines to the correct shape using only your hands
a) true
b) false
b) false
Why is it important that there is no residual pressure in the brake system when in the unapplied position?
a) to prevent the brake fluid from becoming too hot and boiling
b) to make sure that the front brakes do not drag or slightly stay applied
c) to allow the metering valve to fully open
b) to make sure that front brakes do not drag or slightly stay applied
When replacing a master cylinder which of the following steps must be done:
a) measure push rod height/clearance
b) bench bleed the master cylinder
c) torque the mounting bolts to manufacturer specifications
d) all of the above must be done
d) all of the above must be done
During a normal stop which of the following valves is the first to operate?
a) pressure differential valve
b) metering valve
c) proportioning valve
b) metering valve
Wheel cylinders are capable of delivering what kind of force when compared to calipers?
a) more force than a caliper
b) less force than a caliper
c) the same amount of force as a caliper
d) only 100 lbs (45.4 kg) of force
b) less force than a caliper
