| Leak test performed by operating brake |
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| Actuate brake pedal until the brake booster support is no longer present; can be recognised when the brake pedal is hard to move. |
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| Press the brake pedal down approx. 20 mm out of the rest position. |
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| Keep the force on the pedal constant for about 20 seconds. |
| The brake pedal travel should not become longer. |
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| Press pedal with substantial foot pressure. |
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| Keep the force on the pedal constant for about 20 seconds. |
| The brake pedal travel should not become longer. |
| If the brake pedal sags during checking, the visual check of the brake system must be repeated. |
| If no leaks are then found during the test, the brake master cylinder probably has a leak and must be renewed. |
Caution | Ensure that no brake fluid enters the brake servo when renewing the brake master cylinder. |
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