Brake Pedal Assy: Description and Operation

Hydraulic Brake Actuation

The hydraulic brake actuation system consists of the following components:

- Brake master cylinder
- Brake pedal and bracket assembly
- Brake tubes and hoses
- Hydraulic Control Unit (HCU)
- Pressure control valve (non-hybrid vehicles only)

The hydraulic brake system is diagonally split with the LH front and RH rear brakes on one circuit and the RH front and LH rear brakes on the other circuit.


Hydraulic Brake Actuation

The brake pedal is connected to the power brake booster, which is connected to the brake master cylinder. When the brake pedal is pressed, brake fluid is pushed from the master cylinder through the steel tubes, HCU, pressure control valve (non-hybrid vehicles only) and flexible hoses to the front brake calipers and rear wheel cylinders. When the brake pedal is released, brake fluid pressure is relieved, returning the front and rear brake components to the unapplied position.