INTRODUCTION - BRAKE VACUUM SYSTEM

CONSTRUCTION SPECIFICATIONS

The vacuum braking system consists of an intake manifold which supplies the necessary vacuum (with the engine running) for the operation of the brake servo to which it is connected by a pipe and the pump also known as the master cylinder fitted on the brake servo.

The pump is connected by two pipes, each of which suppiles a section of the crossover circuit, to the ABS electro-hydraulic control unit.

See

See descriptions 3340 ANTI-LOCK BRAKING SYSTEM (ABS)

On versions equipped with the ESP function, the pump and the control unit supply pipes are larger because this type of system has a greater fluid capacity.

To facilitate servicing fitting operations, the pipes have a flexible section.

OPERATION

The system provides more powerful and smoother braking through the action of the brake servo. The brake servo is a pneumatic device which, using the effect of the vacuum created inside the intake manifold (with the engine running), provides power for the brake pedal action at the pump and allows smoother braking.

If there is a problem with the vacuum system (or with the engine not running), the operation of the braking system is guaranteed because the connection between the pedal and the brake pump remains operational.

In these emergency conditions, the action on the brake pedal becomes very tiresome and the braking system does not maintain the same responsiveness so it is therefore advisable to drive very carefully to the nearest authorized workshop to have the system checked.