Car (South Africa) - - TECH -

The brake booster’s main func­tion is to as­sist the driver by de­creas­ing the brak­ing ef­fort. The hy­draulic brake-fluid pres­sure in the brak­ing sys­tem needs to be at an ad­e­quate level to achieve the re­quired ac­tu­at­ing forces be­tween the fric­tion sur­faces of the brake pads and discs (or shoes and the drums in the case of drum brakes). The most com­mon sys­tem is the vac­uum servo (pic­tured) that uses vac­uum (air pres­sure) to add to the force ap­plied by the driver on the brake pedal.

In a mod­ern ABS sys­tem, the ABS pump can take over the pres­suris­ing task dur­ing emer­gency brak­ing (brake as­sist) to ac­ti­vate ABS, or to pre­vent a collision when the driver fails to re­act (collision-avoidance sys­tem). Some new sys­tems em­ploy an elec­tric ac­tu­a­tor that re­places the vac­uum booster. It’s a more com­pact sys­tem and al­lows for bet­ter con­trol of the hy­draulic-fluid pres­sure.

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