Hydraulic Brake Actuation

Hydraulic Brake Actuation


Hydraulic Brakes

The hydraulic brake actuation system consists of the following components:

- Brake master cylinder and fluid reservoir
- Brake tubes and hoses
- Brake pedal and bracket
- Hydraulic Control Unit (HCU)

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 forced through the double-walled steel tubes and flexible hoses to the HCU. The brake fluid is then distributed to the front and rear brake calipers. The fluid enters the caliper, forcing the caliper pistons and brake pads outward against the brake disc friction surface, slowing or stopping rotation of the brake disc. When the brake pedal is released, brake fluid pressure is relieved, returning the front and rear brake caliper pistons and brake pads to the unapplied position.

For information on the HCU, refer to Antilock Brakes / Traction Control Systems.


Adjustable Pedals

Adjustable brake and accelerator pedals are available as an optional feature on this vehicle. The brake pedal position can be changed in phase with the accelerator pedal to increase driver comfort. Two different adjustable pedal systems are available; one that is connected to the memory feature option and one that is not connected to the memory feature option.


Without Memory Feature

Adjustable brake pedals without memory feature consist of the following components:

- Adjustable brake pedal and bracket
- Adjustable accelerator pedal and bracket, refer to Fuel Delivery and Air Induction
- Adjustable pedal switch
- Adjustable pedal motor
- Adjustable pedal cables

The pedals are adjusted through the use of a rocker switch mounted on the instrument panel. When the switch is pressed, voltage is sent to the motor which spins a cable that is attached to the adjustable brake pedal. As the cable spins, the pedals move either forward (away from the driver) or rearward (toward the driver) depending on how the switch is pressed.


With Memory Feature

Adjustable brake and accelerator pedals are available as an optional feature on this vehicle. The brake pedal position can be changed in phase with the accelerator pedal to increase driver comfort. Two different adjustable pedal systems are available; one that is connected to the memory feature option and one that is not connected to the memory feature option.

Adjustable brake pedals with memory feature consist of the following components:

- Driver Seat Module (DSM), refer to Seats
- Memory SET switch, refer to Seats
- Remote Keyless Entry (RKE) transmitter, refer to Doors, Hood and Trunk &/or Locks
- Adjustable brake pedal and bracket
- Adjustable accelerator pedal and bracket, refer to Fuel Delivery and Air Induction
- Adjustable pedal switch
- Adjustable pedal motor
- Adjustable pedal cables

The pedals are adjusted through the use of a rocker switch mounted on the instrument panel, the memory SET switch mounted on the seat trim panel or the door trim panel or the RKE transmitter. When the switch is pressed or the transmitter is activated, a voltage signal is sent to the DSM. The DSM then sends voltage to the adjustable pedal motor which spins a cable that is attached to the adjustable brake pedal. As the cable spins, the pedals move either forward (away from the driver) or rearward (toward the driver) depending on how the switch is pressed and/or current pedal position.