Brake Booster - Vacuum

WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.

A vacuum brake booster is available for both gasoline and diesel engine vehicles. The vacuum power brake actuation system consists of the following components:

Brake booster assembly
Brake booster check valve
Vacuum hoses
Brake vacuum pump (diesel engine only)

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.

On diesel engine vehicles equipped with a vacuum brake booster, the brake vacuum pump provides the vacuum necessary for power brake assist operation. The brake vacuum pump is a gear-driven pump that is mounted to the front of the engine behind the accessory drive cooling fan driver and is serviced as an assembly.