Warping discs

1. user_37892 Frequent Poster Joined: Oct 2009 Sheffield Posts: 865 On the lookout

   #1 23rd September 2011, 11:23

   Having problems with the brakes on the sax,
   When I first got the car it had slightly warped discs. I changed them straight away for a set of APEC ones.
   Few months later and the brakes warped again
   Fitted some pagid discs and again after a few months.... Warped
   Same story again, got some premium discs and in a few months... You gussed it warped again
   
   My initial thought was heavy braking but my last set I took really steady with but still came to the same problem.
   I've inspected calipers and they look fine just a little stumped on this now
   
   Symptoms are juddering under braking at high speeds
   Rumbling noise under braking at high speeds
   And at slow speeds you can feel the car stopping and going slowly under braking
   
   Russ
2. Tontsy Saxperience Addict Joined: Oct 2008 Plymouth, Fiddling - under a two poster ramp Posts: 14064 Audi

   #2 23rd September 2011, 11:27

   you are putting new pads with the new discs right ? . . .not just keeping the same pads?
3. user_37892 Frequent Poster Joined: Oct 2009 Sheffield Posts: 865 On the lookout

   #3 23rd September 2011, 11:31

   Yeah haha.
   Forgot to mention that I'm in the trade so have a decent idea what im doing
4. ads85 Frequent Poster Joined: May 2011 Bradford on Avon,Nr Bath Posts: 866 '01 astra coupe

   #4 23rd September 2011, 11:43

   Have you tried adjusting the brake pedal, try this http://www.saxperience.com/forum/sho...d.php?t=194460
5. user_37892 Frequent Poster Joined: Oct 2009 Sheffield Posts: 865 On the lookout

   #5 23rd September 2011, 11:54

   I did adjust that a few months ago but didnt do it enough to keep the brakes on, will double check later though
6. ads85 Frequent Poster Joined: May 2011 Bradford on Avon,Nr Bath Posts: 866 '01 astra coupe

   #6 23rd September 2011, 11:56

   Worth a check, i presume calipers are working as they should and aren't binding/sticking at all
7. Tontsy Saxperience Addict Joined: Oct 2008 Plymouth, Fiddling - under a two poster ramp Posts: 14064 Audi

   #7 23rd September 2011, 11:58

   Quote:

   Originally Posted by ads85 Worth a check, i presume calipers are working as they should and aren't binding/sticking at all

   id be tempted to say the pistons are sticking . . .
   
   take them out, service them ?
8. Gandi699 Saxperience Post Whore Joined: Apr 2011 Posts: 9100 Amazon green VTR 16v, Inferno RS clio 182

   #8 23rd September 2011, 12:05

   Quick q - are the disks running true when fitted to the hubs? Have you checked the disks with a dial indicator. Very odd to be warping all these disks but how hard are you on the brakes?
9. user_37892 Frequent Poster Joined: Oct 2009 Sheffield Posts: 865 On the lookout

   #9 23rd September 2011, 12:52

   Double checked the adjuster, perfectly fine
   Next step I guess is the calipers
   
   Yeah they fit perfect on the hubs
   Not checked with a gauge though as I havnt got one and neither has my work.
   
   I'm definetly not braking too hard as the last set I took extremely carefully, going down gears and braking in plenty of time
10. ryanmt Established Member Joined: Oct 2004 Warrington Posts: 1987 AX VTS 57 3.0 TDI A5

    #10 23rd September 2011, 13:32

    Do you always sit at traffic lights with your foot on the brake rather than using the handbrake? If so that doesnt help!
11. user_37892 Frequent Poster Joined: Oct 2009 Sheffield Posts: 865 On the lookout

    #11 23rd September 2011, 13:53

    Nope handbrake all the time, my ankle has problems if I stit with foot on brake too long
12. ads85 Frequent Poster Joined: May 2011 Bradford on Avon,Nr Bath Posts: 866 '01 astra coupe

    #12 23rd September 2011, 17:15

    Going away from brakes slightly what are wheel bearings like? any play in them
13. DreamEater Established Member Joined: Jun 2011 Hertfordshire Posts: 1574 '07 Saab 93 Vector Sport - '79 Citroën Dyane

    #13 23rd September 2011, 20:04

    I'm currently having the same problem, I've replaced the wheel bearing as that was knackered and now I'm going to replace the hub ~£40 as I've put new pads/discs on and with the car raised, engine on in gear the disc won't spin even at full throttle, but when it does move a little bit, you can see the calliper move from side to side, yet these are brand new true discs.
14. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #14 24th September 2011, 02:21

    simple one... how are you tightening the wheels?
    
    and are the hubs warped?, as these will warp the discs after a couple of months of them being hot under braking..
15. user_37892 Frequent Poster Joined: Oct 2009 Sheffield Posts: 865 On the lookout

    #15 24th September 2011, 19:54

    Quote:

    Originally Posted by blackie_2k5 simple one... how are you tightening the wheels? and are the hubs warped?, as these will warp the discs after a couple of months of them being hot under braking..

    Using the "opposites" method pal.
    
    From an inspection the hubs look sound. No visible signs of warping
16. blackie_2k5 Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B

    #16 24th September 2011, 21:15

    are you torquing them in or just tightnening them tight? as your supposed to torque alloys to about 100mn...wheel braces are just for winding them in, over tightening generally warps the discs
    
    although very few inc myself if im honest do..