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300 Brake servo


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No it's not. Open the bonnet and get someone to press the pedal while you try to locate the hissing. It could be the servo unit itself, the connecting pipe between it and the pump, or the pump itself. When you press the pedal there is quite often a 'squishing' noise, which is just the result of the pedal being used.


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  • 1 month later...


We have exactly the same problem with our 300tdi, a loud hissing noise when you apply the brake. Has anyone got the answer to whether it's the servo,pipe or pump please? Or does anyone know the best way to find out which ones faulty? Aprreciate any help!

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