grinding lipped brake discs

john east wrote:

new discs are very cheap and should have been fitted at the time that the
new pads were.  Buy a matched disc and pad kit and fit the whole lot
together.

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Thanks but the pads have already been fitted. Went to the online 'express
car parts' and total cost of four discs comes to £150 or so. Surely someone
grinding off the discs has to be a more cost effective option please?

john east wrote:

if the disc is lipped enough to cause a problem then it needs to be
replaced.  It will not be cost effective to have your discs reground (which
they could be if they are still thick enough, have you checked?) and the
results are unlikely to be as good as a new set, brakes are an essential
part of a car and scrimping on them is very unwise.

On Wed, 09 Nov 2011 10:00:47 +0000, john east wrote:

[...]


It's more likely that only the front discs are making the noise. You
should be able to find a pair locally for around 50UKP.

Hopefully the discs are not so worn as to be dangerous. If you really
can't afford to spend out on safety-related items for your car, the best
bet would be to put up with the noise; brake squeal in itself is not
always an indication of a fault.

Chris

--
Remove prejudice to reply.

On 09/11/2011 08:13, john east wrote:

The lip has nothing to do with a squeal. Try copper grease

john east laid this down on his screen :

I don't think the lip or lack of would make any difference to the
squeal. Usually the lip can simply be chipped away gently with a small
hammer, but I doubt it is causing any issues.

--
Regards,
        Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

Don't think so either. Otherwise every new set of pads on old discs would
squeal. Assuming any anti-squeal shims or springs are in place and good,
I'd try a smear of copper grease on the pad backing.  


If it is simply rust if might be - but I'd try doing this to steel.

--
*Everyone has a photographic memory. Some just don't have film*

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.

By definition the pads don't touch the lip, or at least new ones will only
just brush it because it's the pads that formed the lip in the first place.
It'll all bed in soon anyway but at 75k it must be well overdue for new
disks if those are original ones. The wear limit is usually about 2mm off
the thickness so if the lip is 1mm on each side they're finished. New pads
on worn disks are not a sensible idea because disks don't wear evenly so the
new pads won't contact them properly and the cost of skimming or a mechanics
time will far outweigh the cost of new disks.

If a disk is worn enough to need skimming it's worn enough to need replacing
basically. Having said that if you have your own lathe like me and your
time's your own then I always lightly skim a part worn disk when I change
pads just to get a perfect contact surface. It wouldn't be cost effective to
do it for anyone else though.
--
Dave Baker

Dave Baker wrote:

You have your own workshop and build engines IIRC? I don't think that many
of us are in the same league.



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