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Thread: Problem when new brake pads fitted

  1. #1
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    Default Problem when new brake pads fitted

    hi guys

    fitted new brake pads today. no problem. fitted in half an hour.
    when engine is running the brake pedal is creeping to the floor.checked for
    the obvious leaks and air locks. bleed them from the master cylinder with no
    joy and bleed from the 2 calipers and the brake pedal is still creeping to the floor.
    when the engine is'nt on the the pedal is rock solid but as soon as i turn the engine on the pedal starts to creep again.

    Am i correct in assuming that the master cylinder seals have been inverted.

    My car is a vectra 2.0 Dti Sxi on a 03 plate.

    any advise would be very much appreciated.
    Last edited by maniac8569; 6th November 2006 at 22:01. Reason: bad spelling

  2. #2
    Regular Member Gsi3.2's Avatar
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    Default

    try reposting mate..nothing showing yet, just 2 words...

    have another crack at it..

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    Admin plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

    Default

    I had this problem before when i did mine. I thought i ******ed it up royaly. After a bit of time about a week the pedal started to come back up on its on. Maybe it was because I wound the rear pistons back too fast?? Mechanic did point out that i refitted the spring clips on the front around the wrong way. inside the edge instead of over the edge and the pads werent being held flat....

    2nd time i did them after fitting red stuff same thing again. pedal to the floor. much bleeding was done in case of air in the system. Made it a little better but again after a week the pedal came back up..

    3rd time someone else did them and they were rock solid from the get-go. Go figure.. Maybe because the pistons were wound in slower??? Who knows????

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    Default

    i only did the front ones. they had a slight lip on the discs like but not sufficiant for new discs.
    also some body told me that i could of inverted the seal's in the master cylinder, because i never released any fluid through bleed niple, before pushing the caliper piston back so i could get the pads in.
    well i hope ya right mate cus my bum hole is really starting to twitch at the thought of a new master cylinder

    and its out of warrenty.

  5. #5
    Admin plasma's Avatar
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    Vehicle : Vectra

    Trim : SRi

    Engine : 150

    Year : 05

    Mileage : 74000

    Default

    The master cylinder on our vectras are double sealed, which was done due to partly to stop this sort of thing happening.. I say partly because i got no clue if there are other reasons lol.

    Happened to me twice and my wallet was twitching a whole lot too.

  6. #6
    Regular Member Gsi3.2's Avatar
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    see if it improves with a few days...the pedal shouldn't feel like that, and it sounds like it may even be servo related..

    if the pedal is firm when the engine isn't running there is no vacumn to the servo, no pedal assistance, and it's all fine in the master cylinder.. if it still sank when the engine was off, then i'd say it was the master cylinder..

    so as it only does this when the engine is running it points to a servo fault..

    Did you slowly compress the piston back??

    the master cylinders are now double rubbered to help resist turning, but it does still happen..

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    Default

    nice one mate
    i really apreciate your advice and i am deffo gonna act on it. gonna give a week to 10 days to see how it goes and then i'm gonna kick 7 bells out of it.
    only joking i ****** love it. By my own modest opinion it the dogs do dah's.

    cheers again mucker, very much appreciated

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    well i did'nt really give it much whelly. pushed a flat head screwdriver between the pad and the piston and let the leverage do the work.
    done this job a hundred time and i never encounterd anything like this before.

  9. #9
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    You can't really do that anymore, you run the risk of putting too much reverse pressure on the seals of both the ABS unit and the master cylinder..

    you need to excert a steady constant force on the piston square on..not a prying force..while releiving the fluid pressure on the line by opening the bleed nipple..

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    oh ****

    so its a big ABS prob the now my bumhole is twitchiing

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