Ford Focus manuals

Ford Focus Service Manual: Brake Booster - Description and Operation

Ford Focus Service Manual / Chassis / Brakes / Hydraulic Brakes / Brake Booster - Description and Operation

The brake booster consists of:

The brake booster is a single-diaphragm type which utilizes engine vacuum to reduce brake pedal effort and travel. The brake booster is divided into separate vacuum and atmospheric chambers by the diaphragms. Engine vacuum is supplied to the brake booster through the brake booster hose and a one-way check valve. The check valve retains the engine vacuum in the brake booster and allows for several power-assisted brake applications with the engine off.

When the brake pedal is applied, vacuum replaces the atmospheric pressure in the brake booster, reducing the effort required at the brake pedal to slow the vehicle. When the brake pedal is released, vacuum returns to the brake booster through the brake booster vacuum hose and check valve.

Hydraulic Brake Actuation
The hydraulic brake actuation system consists of the following components: Brake master cylinder and fluid reservoir Brake pedal and bracket Brake tubes and hoses The brake pedal is co ...

Brake Booster - Removal and Installation
  Item Part Number Description 1 2L523 Booster rod-to-pedal pin 2 W520212 Brake booster nut (4 required) 3 2005 Brake booster ...

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