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Thread: New GM discs and pads are grabbing....

  1. #1
    Regular Member chickenwing's Avatar
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    Default New GM discs and pads are grabbing....

    I have a '03 GSI and I have fitted new GM discs and pads all round.

    I now have an issue where my front to wheels feel like the brakes are on constantly. I jacked the car up and tried to spin the front wheels, but the are very stiff. I can turn them but I have to put a bit of effort in to it and they don't spin freely.

    The rear ones seem ok and will spin freely, but still not as free as I think they were before.

    I know pads will make a bit of contact with discs, but this is like the pedal is being pressed a bit constantly.

    I then took the pads back out, copper greased the the sliders, cleaned them up again and put them back, but still the same.

    I don't really want to have to strip the calipers and bleed the system, but not sure what to do next.

    It sounds like a pressure thing or all four calipers are sticking hmmmm.

    Apart from taking the cap off the brake fluid reservoir, I haven't messed with the brake fluid.

    Any suggestions?

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    Regular Member benny's Avatar
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    Who fitted them ..? Fully trained mechanic ? ... If they wernt like it before and they are now it is either the wrong parts or the fitting is wrong or something had been damaged / broken during the fitting ....you need to take it back to who ever fitted them or find some one who knows what there doing .. Brakes are important

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    VIP-Member Das's Avatar
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    Do the slides move freely in the followers? Corrosion can build up under the rubber followers preventing the slides from moving freely, especially on the rear.

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    Regular Member stevie16v's Avatar
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    Vehicle : Vectra

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    Have you made sure the pistons are pushed back enough? Sometimes they just need a final wee push. If they aren't right back then that'd explain why the pads and discs are rubbing. They also take a couple of hundred miles to bed in properly after that

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    Regular Member byebyeitsagsi's Avatar
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    Are both front wheels doing this or just one???

    My bet is its time for some new calipers going by the age of the car and my previous experience with my old 53 reg GSi.

  6. #6
    Regular Member chickenwing's Avatar
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    Quote Originally Posted by benny View Post
    Who fitted them ..? Fully trained mechanic ? ... If they wernt like it before and they are now it is either the wrong parts or the fitting is wrong or something had been damaged / broken during the fitting ....you need to take it back to who ever fitted them or find some one who knows what there doing .. Brakes are important
    I fitted them. I have fitted pads and discs before, never with any issues. Pads and discs are the correct ones. cheers

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    Regular Member chickenwing's Avatar
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    Quote Originally Posted by stevie16v View Post
    Have you made sure the pistons are pushed back enough? Sometimes they just need a final wee push. If they aren't right back then that'd explain why the pads and discs are rubbing. They also take a couple of hundred miles to bed in properly after that
    I pushed them back completely, so there was more than enough room to fit the new pads and discs.

  8. #8
    Regular Member chickenwing's Avatar
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    Quote Originally Posted by byebyeitsagsi View Post
    Are both front wheels doing this or just one???

    My bet is its time for some new calipers going by the age of the car and my previous experience with my old 53 reg GSi.
    Both front wheels are doing it and to a lesser degree, the back ones. I'm starting to think it's something to do with the brake fluid. As I get in the car from cold, they seem ok. As soon as the car warms up a bit, the brakes feel like they are gripping a bit. I wonder if there is a bit too much fluid in there......hmmm

  9. #9
    Regular Member chickenwing's Avatar
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    [QUOTE=benny;1811336]Who fitted them ..? Fully trained mechanic ? ... If they wernt like it before and they are now it is either the wrong parts or the fitting is wrong or something had been damaged / broken during the fitting ....you need to take it back to who ever fitted them or find some one who knows what there doing .. Brakes are important[/QUOTE ]
    Yes, all the sliders move freely. I have taken them all out and re-greased them.
    Last edited by chickenwing; 14th May 2012 at 12:34.

  10. #10
    Regular Member Neve'o's Avatar
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    You need to get someone to press the brake pedal while you watch the pad, you should see them move slightly to grip the pad and then when the pedal is let up the pads should move away from the disc, these movements will be very small so look closely! Other than that it sounds like either the pistons or sliders are sticking...

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