Brake Booster - Vacuum

WARNING: This page is about a different car, the 2009 Ford Pickup, 2009 Ford F550 Super Duty, 2009 Ford F450 Super Duty, and 2009 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

The vacuum power brake actuation system consists of the following components:

Brake booster assembly
Brake booster vacuum fitting with check valve

Pedal pressure is amplified by the brake booster. The brake booster uses engine vacuum from the intake manifold. The low pressure in the intake manifold is applied to a rubber diaphragm on the vacuum side of the brake booster chamber which then pulls the piston rod in when the brakes are applied to supply a power assist.