Brake Assist System Description and Operation (Hydraulic Assist)

Brake Assist System Description and Operation (Hydraulic Assist)

System Component Description
The brake assist system consists of the following:

Brake Pedal
Receives, multiplies and transfers brake system input force from driver.

Brake Pedal Pushrod
Transfers multiplied input force received from brake pedal to brake booster.

Hydraulic Brake Booster
Uses power steering fluid pressure to decrease effort required by driver when applying brake system input force.
When brake system input force is applied, pressurized power steering fluid is admitted to the rear of an apply piston, providing a decrease in brake pedal effort required. When input force is removed, pressurized power steering fluid is blocked off from the piston.

Power Steering System
Supplies pressurized power steering fluid used by hydraulic brake booster to decrease brake pedal effort.

System Operation
Brake system input force is multiplied by the brake pedal and transferred by the pedal pushrod to the hydraulic brake master cylinder. Effort required to apply the brake system is reduced by the hydraulic brake booster.