beaver34
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| posted on 26/8/13 at 08:42 PM |
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Brake vibration
Hi,
I have a vibration under braking through the wheel, it's done it since I put it back on the road this year after a couple in bits.
What are the normal reasons behind this? Checked for play in everthing and it seems fine
Any one had this before?
Thanks
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Wheels244
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| posted on 26/8/13 at 08:51 PM |
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Warped discs ?
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Bare
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| posted on 26/8/13 at 08:52 PM |
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Typically caused by a brake rotor bouncing against the pads.... due to a warped rotor OR an ineptly mounted one.
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YQUSTA
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| posted on 26/8/13 at 09:21 PM |
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I had this on my Clio and from all the reading I did warped discs is almost a myth, normally it is the surface that the disc is mounted to that has an
uneven surface which gives the impression that the disc is warped, I would start by taking them back off and cleaning the surfaces.
"If in doubt flat out"
Colin McRae
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Wheels244
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| posted on 26/8/13 at 09:38 PM |
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Probably less common on modern vented discs, but I've definitely had warped solid discs before, used to put them in the lathe and skim them flat
again if there was enough meat left on them.
Also my GPZ1000RX used to eat them - most definitely warped when I put them on the surface plate to check - not surprising really hauling 165mph bike
to a halt with single piston calipers..
OP - check the run out with a dti if you've got access to one.
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adithorp
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| posted on 26/8/13 at 09:52 PM |
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quote:
Originally posted by YQUSTA
I had this on my Clio and from all the reading I did warped discs is almost a myth, normally it is the surface that the disc is mounted to that has an
uneven surface which gives the impression that the disc is warped, I would start by taking them back off and cleaning the surfaces.
This ^^^
We get cars in all the time with this and although I have seem actual warped discs it's rare. Of course changing discs cures it but it
wasn't the discs, just that the a faces were cleaned in doing it. The slightest rust or grit between the disc/hub can cause it.
Take the discs off and clean the hub faces and refit. Don't grease or copper-slip the faces (jsut a smear will be OK though not recommended) and
re-build.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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Smoking Frog
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| posted on 26/8/13 at 10:16 PM |
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If the disc is not running true you can often feel the brake pedal pulsing as the disc forces the caliper piston back.
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britishtrident
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| posted on 27/8/13 at 06:10 AM |
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It could be a warped disc but more likely a deposit on the disc surface start by cleaning the discs with 80 grade production paper or one of those
paint stripper pads that fit power drills. Don't be scared to scratch up the disc the aim is to get any deposits off the surface of the
discs.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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mcerd1
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| posted on 27/8/13 at 09:03 AM |
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quote:
Originally posted by adithorp
quote:
Originally posted by YQUSTA
I had this on my Clio and from all the reading I did warped discs is almost a myth, normally it is the surface that the disc is mounted to that has an
uneven surface which gives the impression that the disc is warped, I would start by taking them back off and cleaning the surfaces.
This ^^^
We get cars in all the time with this and although I have seem actual warped discs it's rare. Of course changing discs cures it but it
wasn't the discs, just that the a faces were cleaned in doing it. The slightest rust or grit between the disc/hub can cause it.
Take the discs off and clean the hub faces and refit. Don't grease or copper-slip the faces (jsut a smear will be OK though not recommended) and
re-build.
^^ what they said, if the discs clean up well enough its most likely a bit of crud/rust stuck between the disc and the hub
personally I do use a little copper grease on the face of the hub (and on the face of the disc for the alloy to bolt to) but I just paint a thin smear
with a paint brush - just enough to stop them all seizing solid for the next time you want them apart
if you are using some copper grease make sure you keep everything clean - its also good at collecting all the little rust flakes etc. (still worth it
if your careful IMHO)
-
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