Specifications

19
The regulated vacuum pump system
(only for vehicles with automatic gearboxes)
Input signals
● Signal from pressure sensor for brake servo
Vehicles with an automatic gearbox are equip-
ped with an electric vacuum pump.
This pump supports the brake servo by ensuring
that there is sufficient vacuum at the connection
point for the brake servo.
For further information, please refer to SSP 257 „Electronic Vacuum Pump for Brake Servo
Unit“.
The pressure sensor measures the current pres-
sure and sends this value to the engine control
unit. The engine control unit compares the actual
value with the stored specification and actuates
vacuum pump for brakes V192 via brake servo
relay J569.
1Relay
2 Electric vacuum pump
3 Engine control unit
4 Pressure sensor for brake servo
5 Anti-return valve
6 To intake valve
7Brake servo
1
2
3
4
5
5
6
7
S249_017