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Brake Servo, Check
With the engine switched off, release vacuum in brake servo by
actuating brake pedal several times.
Depress brake pedal, keep under pressure and start engine
Note: The brake
system is operating correctly if the brake pedal drops further. If
the brake pedal does not drop further, 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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Note: If the brakes
are operated for a long period of time on a vehicle with diesel
engine (e.g. at a traffic light or in a traffic queue), negative
pressure is used. Pedal travel is reduced, but normal pedal travel
is resumed once negative pressure has built back up. The driver
often describes this condition as follows: "If the brake is
operated for a long period of time, the brake pedal sinks to the
floor" and or as "spongy brake pedal". This is not to be registered
as a complaint for vehicles with diesel engine as the pressure in
the brake system will increase. This can be demonstrated by
connecting pressure gauge MKM-558-A to
the brake calliper.
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