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Thread: Vacuum Pump Problem

  1. 16th August 2009, 07:10 PM #1
    Jock The Rock
    Jock The Rock is offline ChatterBox
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    Vacuum Pump Problem

    Gday

    Been working on the old mans Defender today.

    For a while it's had crap brakes, I thought maybe just bleed them and they'll come right. So bled them up. No difference. While doing that we noticed the rear calipers were weaping a fair amount of brake fluid, so I ordered 2 rebuild kits. They went in today.

    Still no difference

    But then I noticed they didn't feel right. I had a thought and took it for a spin down the drive. Drive along, brakes are bad, switch engine off, brakes the same Breakthrough

    Then when sitting with the engine running, I pumped the brake pedal and I could feel them getting harder and harder then if you hold it on you can feel the pedal going down.

    Now it was dark by then so I didn't have much of a look, but whats wrong?

    Is the pump itself buggered? Is an airline leaking?

    Is this a common problem?

    Thanks
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  2. 16th August 2009, 07:54 PM #2
    procrastination inc
    procrastination inc is offline Master
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    "Then when sitting with the engine running, I pumped the brake pedal and I could feel them getting harder and harder then if you hold it on you can feel the pedal going down."

    That doesn't sound like a vacuum prob to me. More like brake fluid leakage. If you aren't loosing any, then it is probably internat leakage in the master cylinder
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  3. 16th August 2009, 07:56 PM #3
    Jock The Rock
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    Should have thought of that

    I'll check it out

    Thanks mate
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  4. 16th August 2009, 07:58 PM #4
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    justinc
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    These Tdi Defenders also develop splits at the booster where the Mcyl bolts on, causing a vac leak. The sinking pedal as mentioned could be a fluid leak or bypass inside the Mcyl. Needs further investigation

    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  5. 23rd August 2009, 04:05 PM #5
    Jock The Rock
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    Had a look today and theres a split in the metal where the master cylinder bolts on, gave it a bit of a press and I could hear air getting sucked in

    So I'll be on the lookout for one of them

    You don't have a spare one knocking about anywhere down there do you JC?
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