Brakes Flashcards
On a front wheel drive vehicle front brakes provide what % of braking
60%
On a rear wheel drive vehicle front brakes provide what % of braking
80%
Hydraulic brake systems consist of:
- master cylinder
- wheel cylinder
- brake lines and hoses
- fluid
The brake master cylinder converts:
Operator foot pressure to fluid pressure
A master cylinder is comprised of
- housing
- reservoir
- piston
- return spring
- boot
- check valve
What master cylinder do modern vehicles use
Dual master cylinder
Wheel brake cylinders convert:
Hydraulic pressure into mechanical pressure to apply brake shoes
How are brake lines constructed
Double walled steel tubes with a double lap flare
Drum brakes consist of:
- backing plate
- wheel cylinder
- brake shoes and linings
- retracting springs
- hold down springs
- brake drum
- adjuster
What does a brake metering valve do
Equalizes pressure at each wheel
What does a brake proportioning valve do
Limits pressure to rear brakes when more pressure is needed for front brakes
What is brake pedal free play
Pedal movement before brake application
What is brake pedal height
Distance from the pedal to floor at rest
What is brake pedal reserve
Pedal to floor distance with brakes applied
Brake shoe linings must not be worn past
1/16”
