Ford Focus Service Manual: Brake Booster - Description and Operation
The brake booster consists of:
- brake booster assembly
- brake booster vacuum hose
- brake booster vacuum check valve
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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Ford Focus Fuel System Pressure Release
WARNING: Do not
smoke, carry lighted tobacco or have an open flame of any type when working on or
near any fuel-related component. Highly flammable mixtures are always present and
may be ignited. Failure to follow these instructions may result in serious personal
injury.
WARNING: Do not
...
