Brake Booster/Suction-Jet Pump

Suction-Jet Pump / Brake Booster S54

Suction-jet pump / brake booster S54
The suction-jet pump creates the necessary partial vacuum for the brake booster and also for the "Heat catalytic converter" function. When no power is applied, the suction jet pump valve is open and has a brake pressure boosting effect.

Depending on the engine temperature and selector-lever setting, the suction-jet-pump valve is supplied with current if the partial vacuum is also sufficient without suction-jet pump.