Warped Discs - Anyone else having same problem?

The Captain

Active Member
Jul 23, 2016
18
0
VAG tend to fit Ate (Part of the Continental Tyres group) I can also recommend Juratek, Mintex, Pagid and Brembo, I've used them all.

Juratek brakes are made in England to very high standard. Properly fitted and maintained brakes should not warp. Brakes generate high temperatures so running through water cools the disc too quickly and can lead to warping.

Last set I bought were Juratek front discs and pads (VW Polo 6R). Ran them for 2 years and when I sold the car there was still plenty of life left.

Another reason for not sitting stopped with the brakes on is you may cause dazzle to the driver behind, especially in rain or at night. It could also make your indicator difficult to see. Do not sit with the foot brake on, use the hand brake when stationary, or for very short periods, hold it on the clutch.
 

dm222

Active Member
Dec 7, 2013
1,488
49
this problem just got worse... is it worth replacing the discs again, or is it certain that I have another problem? wich brand do you recomend?
 
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The Captain

Active Member
Jul 23, 2016
18
0
Use any of the premium brands. You will get a good deal from many of the online parts suppliers or auction sites.

Make sure that you thoroughly clean the hub face with a wire brush so that the new discs sit flush with no 'run out'. Always fit new pads with new discs.

Use ceratec or similar on the sides and rear of the pads and clean up the caliper guide pins and slide. If the guide pins are badly corroded can get caliper repair kit to replace the guides and the rubber bushes. About £10 for a set which does both sides.

There are good fitting videos available on youtube for other VAG cars which should be identical to your Seat.
 

VeeFource

Active Member
Dec 5, 2014
126
4
It’s not actually that hard to warp discs and this most often happens for 3 reasons:

1. Sticking calliper – This will cause the disk to overheat and replacing the disc and pads can often make it worse as the calliper pistons will be pushed further in due to the increased thickness of the pads and discs. This means the piston seals are more likely to be working on a corroded/dirty part of the piston with increased resistance. Always inspect and clean the piston before fitting new pads and discs. It’s also worth jacking the wheels up after driving for a short while to make sure they’re spinning freely (or at the very least, carefully check the discs aren’t getting too hot after driving sedately).

2. Stopping with hot discs – If you stop on hot brakes, the portion of disc under the pads is insulated from the cool surrounding air which causes the rest of the disc to cool faster and this temperature difference stresses and warps the disc. There’s nothing wrong with stopping on the brakes as long as the discs have had chance to cool uniformly before you do so, so try to allow >5 seconds of coasting before stopping completely after braking from high speed and longer if heavy braking from high speed. Slowing to sub 15mph a short distance before stopping at the lights at the end of a slip road for example is generally a good idea as you can then coast off the brakes for the last bit which allows the discs to cool uniformly because they’re still rotating.

3. Not bedding in properly – New discs and/or pads need to be gradually bedded in over the first 500 miles, again to ensure everything heats up and cools down uniformly. Not stopping on hot discs is even more important when bedding in so you’ll need to allow up 10 seconds of coasting after braking from a high speed.

Unfortunately once discs are warped they'll never fully recover because the thicker portions of the disc see more braking force than the rest and get hotter as a result ending up in a vicious circle. New discs are the only option I'm afraid.
 
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dm222

Active Member
Dec 7, 2013
1,488
49
thank you all for yours answers, seems I need new discs I will try to keep them as long as I can because I know probably it will happen again.

What would be the symptoms of a Sticking calliper, stiffer brake pedal applies?
 
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