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 from the master cylinder, which distributes the fluid between the front and rear wheels, through the double-walled steel tubes and flexible hoses into two ports in the HCU. One port is for the front wheels, the other is for the rear wheels. The HCU then distributes the fluid to the individual brake calipers at each wheel. The fluid enters the caliper, forcing the caliper pistons and brake pads 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 ANTI-LOCK BRAKE SYSTEM (ABS) & STABILITY CONTROL .