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Brake Servo, Check
Note: For vehicles
with diesel engine, if the brake is activated for a long period,
the vacuum pressure will be exhausted. The pedal travel is shorter
as there is no brake force amplification from the brake servo, but
within a very short time after building up the vacuum the pedal
travel returns to normal. This behaviour is often described by
drivers as "On lengthy braking, the brake pedal goes right down to
the floor" and/or as a "spongy pedal". This is not a cause for
complaint in vehicles with diesel engines.
| 1. |
Reduce negative air pressure in brake servo
Note: With the engine
off, by depressing the brake pedal several times
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| 2. |
press down brake pedal and maintain pressure
| • |
Start engine
Note: The brake system
is operating correctly if the brake pedal drops further. If the
brake pedal does not drop, the vacuum system (vacuum line,
non-return valve) must be checked. If no fault can be found there,
the problem rests with the brake servo itself.
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