12 replies to this topic

[Knuckles]

I recently replacing front discs and pads on my mini cooper spi. then replaced front calipers as well because they were sticking slightly. But now after all this i get brake squealing when coming to a stop. ive tried taking pads out and copper slipping the edges and backs of them. But no joy.

Any ideas or thoughts ?
Discs and pads came from mini spares
calipers were remanufactured units from delco remy
thanks
clark

Edited by Knuckles, 20 November 2011 - 10:01 PM.

[bmcecosse]

Try a light chamfer of the pad edges - or maybe they just need a good 'running in' ! Try a few hard stops in a row until they start to fade - that should sort it!

[Knuckles]

Try a light chamfer of the pad edges - or maybe they just need a good 'running in' ! Try a few hard stops in a row until they start to fade - that should sort it!

Cheers i will try that - i have already tried lots of emergency stops but no joy.

if i get no luck i may try some other pads as the ones i got from mini spares were the cheapest set they do

[Spitz]

I'll be watching this one.
My brakes squeel terribly....worst at extremely low speed rolling near to a stop. Very loud.
I've tried the goopy you can get to spray on the back side of the pads....no change.
I believe mine are "mintec".
Didn't used to squeel when I first fitted them a couple of years ago ( maybe 4000km on them )

[LukeMoss]

Mine squeeled until I change the pads yesterday just standard one with some copper grease on the back, seem to be going fine now

[Beej123]

As above, chamfer the front edges, worked with mine and they were very cheap haha

[Giant Mini]

I know from replacing bike pads that if there is any oil on the pads or discs when they are first installed then the pads suck that stuff in and that causes them to squeal. I've tried to stop it when it happened to me by sanding and using brake cleaner but no joy until i cleaned it all up and replaced the pads

[RossKnight]

I asked cooperman basically the same question, this was his reply 'Maybe you should try to get them nice and hot, by driving along at 40 mph in 3rd and at full throttle whilst braking lightly with the left foot until they are hot. '

I did this and mine haven't squealed since

[jakejakejake1]

I had a similar problem with my mountain bike before (Hydraulic disk breaks, got fluid on the pads) and the way I fixed them was to do as Ross said, get them nice and hot, it burns off whatever gunk is on them.
Admittedly around my way there wasn't a big enough hill so we just heated the disk with a gas torch while applying the breaks and rotating the wheel.
But obviously you could just drive with the breaks on slightly, or find a nice long hill, put it in 4th and use the breaks the whole way down, should make them nice and hot.

But beware, the break fade will be terrible so take this into account and leave plenty of space between you and other cars!

Jake

[orac69]

I had this too many times - its actually nothing to do with the discs or pads in most cases - its the calipers sticking / not releasing.  So either take them to bits, reseal, re-piston the calipers, or better still just replace them - not hugely expensive.

[68+86auto]

One thing to watch out for is the new pad retainers are the wrong size so will hit the disc intermittently. They need to be modified to be usable.

[Spider]

I've had both of these over the years.

 

I had this too many times - its actually nothing to do with the discs or pads in most cases - its the calipers sticking / not releasing.  So either take them to bits, reseal, re-piston the calipers, or better still just replace them - not hugely expensive.

 

I have found with some new calipers the seals are dry and yes, the pistons stick. They will self lubricate though from brake fluid. Remove one pad at a time, extend the Piston out about 5 mm by pumping the pedal a few times, press it back, fit the pad and work through each of them in turn in this manner. That puts enough fluid on the seals for lubrication.

 

 

One thing to watch out for is the new pad retainers are the wrong size so will hit the disc intermittently. They need to be modified to be usable.

 

Yes, this one drove a mate mad, trying all manner of things, but just a quick touch on the bench grinder with the spring clip - months of squealing gone !

 

[StefanMini]

I fitted these shims, after that no squeeling anymore!

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