Power Brake Assist: Description and Operation

Power Brake Actuation

Component Description

Brake Vacuum Pump

Vehicles equipped with 2.0L GTDI engines utilize an engine mounted/cam driven vacuum pump to supply vacuum to the brake booster.

Brake Booster Vacuum Sensor

The brake booster vacuum sensor is a piezoelectric device used by the ABS (Anti-Lock Brake System) module to monitor the vacuum in the brake booster. The sensor is hardwired to the ABS (Anti-Lock Brake System) module by 3 circuits. One circuit is for the 5 volt sensor supply, one circuit is for sensor ground and one circuit is for sensor output. The sensor output ranges from 0.7 volt to 4.9 volts, depending on the amount of vacuum in the booster. The sensor is located on the front of the brake booster at the 6 o'clock position and can be serviced separately from the brake booster.