Just been on a 75 mile trip and discovered that the OSF wheel is hot to the touch, while the NSF is quite cool. The OSF also squeaks when under load.
It has only a few days ago had the brake fluid changed and the NSF had a sticky caliper which was rectified but this new problem is new as of yesterday.
Any advice appreciated. Thanks.
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It sounds like you've got the same problem. Jack it up and see if it spins freely. If not crack the bleed nipple open to confirm it's not a hydraulics problem. If it fails to spin freely then this confirms the caliper.
Did they replace the NSF one when they did it or did they just free it off?
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Would the brake fluid change have anything to do with it? The NSF was simply freed up - he said it wasnt seized but it was sticking somewhat which has caused a squeal from it. Sods law that fix one side and the other starts eh.
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Would the brake fluid change have anything to do with it?
No, it's the caliper seal which returns the piston so new/different brake fluid shouldn't have anything to do with it.
The reason I asked you to crack open the bleed nipple was to see whether this was a hydraulic problem with the hoses or master cylinder. As you've had the same problem OSF I'd put my money on the caliper.
Not so much sod's law, I'd half expect it if one side has done it already.
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Many thanks chap, im gonna sit outside my local indy to get it sorted in the morning.
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I had the caliper fixed and it was fine for about half a day, then the symptoms returned and the wheel started getting hot again - could there be an underlying cause making it stick?
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Sounds like a 'slow' piston in the Caliper, did the garage just push the pistons in and out a few times? Or did they just squirt it with WD-40 (eeek! -I've seen this done at one of the tyre depot chains). Only way to truly fix is to pump out the pistons, inspect and clean (& possibly replace pistons if badly corroded) followed & rebuild with fresh seals. Happens all the time on Japanese motorbikes which are rarely fitted with external piston seals at the caliper.
Edited by Chrome on 04/11/2008 at 19:00
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He did clean them throughly but no seals replaced. As of right now, it appears to have freed up again - very annoying! He said it was moving smoothly when he replaced them, but when I jacked the car up earlier, I could spin the NSF wheel 2.5 times round, but the OSF didnt even do one rotation before stopping suggesting that something is amiss.
Im not a brake parts guy - what seals?
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Im not a brake parts guy - what seals?
There are technically two seals per brake caliper piston. The first is really a dust cover and just stops dirt getting between the piston and cylinder.
The second rubber seal sits between the piston and the cylinder (like an engine piston ring, though sits in the cylinder rather than the piston). The obvious role of this is to prevent fluid leaking out from between the piston and cylinder. Its most important purpose, however, is to flex upon brake application and remain deformed until the brake pedal is released; the seal will then pull the piston away from the brake disc and thus help create a small gap between the pads and discs.
Old/damaged seals won't deform enough to pull the piston back when you release the brakes. Also the outer seal is not perfect and water will creep in over time, rusting the seal grove and damaging the piston surface on which it acts.
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I had the caliper fixed and it was fine for about half a day
Next step then is to replace the caliper, if the garage didn't.
Chrome's right they probably just pushed it back a few times, which won't work with a rust-encrusted seal and damaged piston.
With all the hastle, these days (as I found out on the Escort) it's cheap enough just to replace the caliper.
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With all the hastle these days (as I found out on the Escort) it's cheap enough just to replace the caliper.
Nothing's cheap on a Daihatsu, if you have to go to Daihatsu to get the part, which you usually do.
Latest example is front oxygen sensor for our Charade at £150.
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