Hydraulic Brakes Flashcards
What law describes how energy is never consumed?
Law of conservation of Energy
What is miscibility?
The ability of brake fluid to be mixed with similar rated brake fluids
What is hygroscopic ?
The ability of brake fluid to absorb moisture.
Which brake fluid is silicone based?
DOT 5
Why is DOT 5 brake fluid not recommended for use in an ABS system?
DOT 5 brake fluid is not hygroscopic
Torque is
Rotational force
Power is
Rate of doing work
Energy is
Ability to do work
Work is
Force acting through a distance
Heat is
Amount of molecular energy
Steel springs are used to reduce abrasion on the brake line
Steel springs are used to reduce abrasion on the brake line
What is the purpose of the spring and expander in the wheel cylinder
The springs prevents air from entering the wheel cylinders when the braked are released
What best describes brake shoes used in a non servo design which self energize when the vehicle is moving forward?
Forward acting
What best describes the term centerfuse construction
The brake drum is a steel outter shell and a cast iron liner
The combination valve contains the metering valve and proportioning valve. T or F
True
Which port in the master cylinder allows fluid movement during a fast pedal return
The inlet port
Why are disc brake pads and rotors repaired as units?
Disc brake pads and rotors are repaired in units because they wear against eachother
What can cause the brake pedal to slowly move towards the floor when a steady brake application is made?
Master cylinder internal piston seal leak
What is the best check for proper brake operation?
Road test
Brake shoes should be replaced in sets across an axel
Brake shoes should be replaced in setsvacross an axel
Backing plates do not transfer any type of braking forces. T or F
False
What is meant by the “discard diameter”
Discard diameter is the maximum inside diameter a drum can have
Taper is narrow top and wide bottom
Taper is narrow top and wide bottom
Why must a brake drum never be machined past the maximum spec
The drum will no longer be able to absorb the heat
Brake fluid must be replaced because it absorbs water
Brake fluid must be replaced because it absorbs water
What provides the force in a power cluster system
The compressed air
What supplies the signal pressure in the operation of a power cluster
Air valve
What precaution must be observed prior to servicing an accumulator type hydraulic over hydraulic brake booster system
Pump the brake pedal with key off
Where would a flow switch be located Ina hydraulic over hydraulic brake booster system
Between brake booster and the power steering reservoir
What is the function of the EH pump
The EH pump supplies hydraulic fluid flow to the hydraulic brake booster
Why does the brake pedal move slowly to the floor after the vehicle is started if the pedal has already been applied
The engine vacuum has been allowed to enter the vacuum chamber of the booster at the atmospheric air supplies boost
Hydraulic parking brakes are spring applied and hydraulically released
Hydraulic parking brakes are spring applied and Hydraulically released
Which step should be performed first when adjusting an external band type of parking brake
Side lining to drum clearance
Which poly glycol based brake fluid has the highest boiling point
Dot 4
Why should brake fluid be stored a sealed container
The fluid is Hygroscopic
