scottc
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| posted on 24/12/06 at 02:10 PM |
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uneven pad wear - sliding caliper
Hi.
Just been out to check out the pads on our megane.....and the outer pad is worn to about 3 - 4mm while the inner pad has about 12mm or so left on
it.
Its a sliding caliper and the piston pushes against the inner pad.
surely you'd expect the inner pad to be more worn than the outer? The sliding mechanism doesn't seem to be seized....... any ideas??
Merry Christmas
P.S tried asking on a renault specific forum, but the usual response ranges from......is it still under warranty, to take it to your local
dealer..... How helpful!!
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nitram38
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| posted on 24/12/06 at 02:47 PM |
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Take the pads out and clean the ends, they can stick in the caliper too.
With the pads out, see if the caliper will slide from side to side on the adjusters.
If it is a dual pot caliper (one on each pad) maybe the piston is stuck?
If so, put a good pad on the side where the thinest one was and gently try to eject the sticking piston by putting your foot on the brake pedal. Be
careful doing this as you do not want the piston to come right out!
[Edited on 24/12/2006 by nitram38]
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scottc
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| posted on 24/12/06 at 02:54 PM |
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Thanks Martin,
I've had the pads out. Both came out relatively easy I was able to push the piston back in by pulling the caliper towards me (single Piston).
the caliper comes off leaving the pads in the mount.
It's a 'new' car, and the pedal is really soft - goes to the floor and the car glides to a stop. lol.
The guide pins move freely and it seems the caliper moves ok.
in addition I can't turn the disc. The pads seem to grabbing.
I don't have a dial indicator to measure the disc run out but think they're slightly warped. Could this be causing the pad wear?
Edit: I did manage to turn the disc, by putting two wheel bolts back in and using a 2 foot breaker bar!
[Edited on 24/12/06 by scottc]
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thunderace
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| posted on 24/12/06 at 03:09 PM |
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if its a new car take it back and get it fixed??
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scottc
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| posted on 24/12/06 at 03:11 PM |
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sorry. new was in inverted commas - ie new to me. in reality its 10yrs old and hasn't been serviced in 6 yrs
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thunderace
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| posted on 24/12/06 at 03:13 PM |
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what make and model??and engine size
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scottc
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| posted on 24/12/06 at 03:16 PM |
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Renault Megane, 1.6 8v. vented discs with lucas calipers.
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thunderace
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| posted on 24/12/06 at 03:22 PM |
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Renault check there was not a recall with that car ,i have fount out a number of times i have had a problem and it would have been done for free (ie
corsa gear select fault)i know your will not be free but its worth a call.
someone may have only changed one pad i have seen it
[Edited on 24/12/06 by thunderace]
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britishtrident
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| posted on 24/12/06 at 06:43 PM |
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12 mm on the inner pads enough to signal they are due for a change anyway.
These days on OEM spec pads it is common for a slightly different pad material is used for the inner and outer pads.
Biggest cause of pad wear in normal road cars is water, disc gets wet coats the pad and when the brake is applied instantly turns to steam which
causes ablation of the surface pad material.
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goodall
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| posted on 24/12/06 at 07:18 PM |
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on all the audi front brakes i'v worked on thats 3 car from the 80's the pads also wear at different rates
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