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Thread: Broken Rear Brake Piston - Please help

  1. #1
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    Default Broken Rear Brake Piston - Please help

    Hi

    Vauxhall Vectra 2.2 Auto - 06 plate

    Thought I would change the rear brake pads on my car. Didn't read the "How 2" section first and I think I have broken one of the rear calipers.

    I tried to force the piston back and didn't realise it is supposed to be screwed back in. The piston won't screw back in now. I only just managed to put the old pads back in and just about put the caliper back on. The piston wont go back enough to put the new pads in.

    Is the piston now broke and will never screw back in. If this is the case will I need to buy a new caliper?

    Thanks in advance.

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    Vehicle : Vectra C

    Trim : LS

    Engine : 2.0 DTi

    Year : 52

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    I had trouble on the wifes Alhambra screwing the piston in. I put as much force on it as I could while turning but it would not screw in. I ended up using an old g-clamp which happened to turn the piston in while tightening and job done. I would say that a lot of force would be needed to break the screw part of it. I have also done them on another car (can't remember what) and seemed to be ages turning and pushing before the piston started to go in, then it went all the way in all of a sudden. . I would say try again with lots of turning (haynes says clockwise) and pressure

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    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

    Mileage : 000

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    The one side of mine was so tight to turn It was unbelivable. Then suddenly "pop" it scrwed in ok. Why it was like that I don,t know the other side went in with no problem. I take it you are turning the piston the correct way. But if you are using a rewind tool you must be.

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    I'm using small pliers. I was turning it clockwise and putting pressure on it at the same time but it hasn't budged. It is turning clockwise fairly easy so I think I might have damaged it when I clamped it.

  5. #5
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

    Mileage : 000

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    If it is turning one way easy. I doubt that you have damaged it. Have you unscrewed the fluid resvoir top as it may let some pressure off the piston.

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    Regular Member stevoxsi's Avatar
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    Vehicle : Insignia

    Trim : Sri Vx-line

    Engine : 2.0 Cdti 160

    Year : 2011

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    I've seen me screwing the piston out a bit to get it to free up. Problem is, that usually means bleeding everything and the seals are easy to nip.

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    Where do you live rocket999? I'm in Chelmsford, you nearby?

    Did you release the bleed nipple when you were pushing the piston back? I always do to avoid pushing potentially dirty fluid back into the pipes and ABS pump.

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    Vehicle : Vectra

    Trim : Exclusive

    Engine : 1.8vvt (Z18XER)

    Year : 2007

    Mileage : 58000

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    The screw motion is used by the handbrake mechanism on rear calipers - is the handbrake ok ? I which case try a proper re-wind tool which winds as it pushes as it winds ....

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    Quote Originally Posted by DNS View Post
    Where do you live rocket999? I'm in Chelmsford, you nearby?

    Did you release the bleed nipple when you were pushing the piston back? I always do to avoid pushing potentially dirty fluid back into the pipes and ABS pump.
    Im Southend way.

    I used a lot of pressure on it using the g clamp :-(

    I spent quite a while turning it and pushing it but it didn't retract. I didn't open the bleed valve as I don't want to re-bleed the system.

    If I had damaged the piston would the handbrake still work?

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    I did open the fluid reservoir and also tried doing it with the handbrake on and off but still no joy.

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