| Brake servo unit without brake assistance |
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| With the engine off press down brake pedal repeatedly with force (this reduces the pressure already present in the device). |
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| Now hold the brake pedal in brake position using a medium foot pressure and start the engine. |
| If the brake servo unit operates perfectly the brake pedal must yield noticeably under your foot (servo boost takes effect). |
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| If there are any complaints, replace the brake servo unit. |
| Brake servo unit with mechanical brake assistance |
| Check the operation of the brake servo unit |
| Brake servo unit without brake assistance → Chapter. |
| Check the operation of the brake assistance |
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| With the engine running (full vacuum support must be guaranteed) forcefully apply the brake pedal. While doing so, a "click" must be audible (the brake assistance is activated). |
| If no "click" is audible, then the brake assistance is defective and the brake servo unit must be replaced completely. |
| When subsequently releasing the brake pedal, a considerably reduced force is exerted onto the foot from the brake pedal when braking. |
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