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Thread: Rear brake pads don't fit holes in piston

  1. #1
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    Question Rear brake pads don't fit holes in piston

    Evening all, I've just spent a couple of hours in the rain trying to fit new discs and pads to the rear of my 2006 Signum, and I've had to throw the towel in after fitting only one disc because the studs (or posts) on the piston-side brake pad do not match the holes in the piston.

    I used a brake rewind kit from eBay to successfully wind the piston back. On the adapter disc that fits the brake piston, the studs are 5mm in diameter with 19mm centres.

    After 10 minutes of fruitlessly trying to fit the Pagid brake pads I bought from Euro Car Parts, I decided to measure the studs on the back of the pad, and found they were diameter 5.6mm with their centres spaced at 22.2mm.

    My first thought was that I'd just purchased the wrong pads, but I double-checked the serial number on the box and the website, and found that they are the ones specified for my car. It could still be a mistake on the part of Euro Car Parts, however I checked the studs on the old pads and surprisingly they also seem to be around 5.6mm with 22mm centres.

    2012-07-12-22.11.jpg

    I set out to replace the pads because of a god awful rattle from the rear end every time the car went over a bump. On inspection I found the offside pads were worn very unevenly, and looked like wedges. The two studs on the back of the offside piston pad were well worn - presumably from not fitting in the piston holes correctly.

    I'm really stuck now... has anyone got any advice on what to do? Obviously I don't want to keep buying sets of pads only to find they don't fit. From what I've read on this forum, 5mm holes/19mm spacing seems to be correct for the piston. It's strange that the previous set of pads also has the wrong hole spacing.

    I don't want to fit the new pads without the pad studs fitting the piston, otherwise I'm certain the pads will come loose and wear badly again.

    Cheers for looking.

    Chris

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    Regular Member alcutler's Avatar
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    What do the pegs do - I have never seen them on any other brake pads - I had this on my Vectra estate and ground them off - never had any problems. I had a Saab with very similar screw in pistons and the pads for that never had pegs on them.

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    Earlier I read somewhere (may have been on here) that the studs are there to stop the piston turning as it operates. Not fully understanding the rear brake assembly, I am not sure how important this might be...

    I might give the angle grinder an airing tomorrow...

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    Regular Member rushy's Avatar
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    i think your putting the pads in the wrong way round mate.

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    Regular Member merikiito's Avatar
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    Quote Originally Posted by rushy View Post
    i think your putting the pads in the wrong way round mate.
    WHS they are not meant to match in with the holes on the piston

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    never seen one like that, always been a metal clip that slides over the piston or the ones which have spring clips at the top of the pad edge to push against the metalwork to hold it firm
    Plasma's Tech2 services are now open and able to provide services

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    Regular Member rushy's Avatar
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    LOL, yea just checked my first set of pads that are still in the cellar and your fitting them the wrong way round.

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    Regular Member rushy's Avatar
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    Thats what he's got Dean, you can see the spring clip on the other pad.

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    I don't think the pegs engage the piston. The piston needs to rotate as it is pushed out of the caliper housing. If the pegs engaged in the piston then the piston would not twist and release.

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    So the pad with the metal spring goes against the piston?

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