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Thread: 300 TDI brake problem

  1. #1
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    Default 300 TDI brake problem

    Hi
    I have a '95 (Mreg) 300 TDI Disco.
    The brake performance has deteriorated significantly, and it seemed to go all at once. I found myself heading to a junction with diminished braking performance and the pedal was "dead hard".
    I pulled the vac tube off the servo and the vac pump is sucking, but don't have a vac gauge, so don't know exactly how hard.
    The vac inlet 1 way valve to the servo isn't a 1 way valve any more, I can blow through both ways.
    When doing the "start the engine with the brake pedal pressed" it feels the same with the vac connected or disconnected.
    I think the vac pump is doing something as when I press the brake when everything is connected up, I can hear a noise that sounds like fluid moving.
    If I coast down the road at 30 mph in neutral, left foot brake whilst revving the engine with right foot, its just as bad.

    So, now questions please:
    1) How much of the problem is the knackered 1 way valve likely to be?
    1) How hard should the vac pump suck and it there a particular engine speed to test at? I can probably get a vac gauge, or improvise.
    2) Seems to me like the servo is leaking the vac away based on the sound I can hear. Are the servo's practically rebuildable?
    3) Have I missed anything obvious pls?

    Cheers
    Graham

  2. #2
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    Default Re: 300 TDI brake problem

    All fixed now, it was the vac servo. I only knew for sure when I put a new one on and had brakes again - better than they ever were I think.
    The only red herring in the observations I made was the fact that sucking on the vac inlet gives no resistance on the new one as well. Don't know why and don't care.
    Cheers
    Graham

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