504 rear callipers...can't turn piston
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  1. #1
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    Default 504 rear callipers...can't turn piston

    Has anyone got any hints or tips for pushing in the rear calliper piston on a peugeot 504? I understand you need to turn it 45 degree before trying to push the piston in, when fitting new disc pads, but I can't turn it at all.

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    Suggestions, anyone?

  2. #2
    1000+ Posts Peter C's Avatar
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    I've never had that problem. They can be fairly hard to rotate, though. I usually use a large suitably sized screwdriver placed in one side of the slot which gives enough leverage.
    Last edited by Peter C; 14th January 2020 at 09:37 AM.

  3. #3
    Fellow Frogger!
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    When I did mine I had a piece of steel that fitted into the slot (8mm from memory)that I could attach a spanner to . Never had a problem in rotating the piston this way . Once the piston is back don't forget to return the slot to the original position

  4. #4
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    Thanks. Will have another crack at it...

  5. #5
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    https://www.ebay.com.au/itm/Brake-Pa....c100677.m4598

    There are cheaper ones too and you can use them on many cars.

  6. #6
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    I have always used a screwdriver on its side to rotate it .Also it is a good idea to attach a tube to the bleed screw and open it when pushing the pisten in to avoid the reservoir at the front from overflowing.

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