Snarling & angry disc brakes!

[Gippo]

Anyone have a cure for disc brakes that vibrates and growl just before coming to a stop?

Mine does it for about 2 metres and its thats loud that I almost don't want to use it altogether!

Has brand new pads that have been correctly bedded in......I confess its a Hyo but before you flame the poor bike, it didn't do it before the pad change and it was done by a qualified mechanic.

Before I take the bike back in, I was thinking of putting high temp lithium grease on the back of the pads.....seen this work in cars but it does concern me that I'll be putting grease near my braking surface.

Anyone have any better ideas before I ring the mechanic?

[Desmo]

Use copper grease on the back of the pads and chamfer the leading edge of the pads too.

[Para045]

The pads were put in straight? I know with the BB that if the pads are not put in correctly against the spring clip it can cause pad misalignment and vibrations

Also were the pistons cleaned? They could be jamming in the bores causing it

[agrid]

As Desmo points out, the hideous noise comes from vibraton between the pad and the piston, no tthe pad and the disk. I had a rear disk on a KTM that I couldn't stop from howling, grease and anti-squeel didn't help but sintered pads did to some extent.

[Gippo]

The pads were put in straight? I know with the BB that if the pads are not put in correctly against the spring clip it can cause pad misalignment and vibrations

Also were the pistons cleaned? They could be jamming in the bores causing it

Heya,

Yer pistons were cleaned. Watched the mechanic do it, but not sure if he put copper grease on the back of the pads - oh and I like the chamfer idea.

I gotta say its the most annoying noise ever, occasionally it makes me jump outta my skin when lane splitting! It happens at about 10% pressure on the rear brake kinda like its just rubbing on the disc. Does it the whole time the bike manages to keep moving but shuts up if you apply more braking pressure. Definitely vibrations from the pad contacting the piston.

Never heard it so bad before in any vehicle - so somethings gotta be wrong... is it reasonable to expect the mechanic to "make good" without additional cost?

[agrid]

There are shims that can be slipped in between the piston at the pad. I've never tried them on a motorcycle though.

[Paraletic]

are they oem pads? lots of aftermarket pads are more race orientated than the standard ones. but these usually produce a 'whine' under hard braking.

have a look at your rotor surface for any different patterns on it. sometimes a shiny surface, or blueish sections can give issues. you should still see slight crosshatch marks as well, if not they may need to be cleaned up. also run your fingernail accross the surface (not around) if your nail catches it is not flat, this will make it very difficult to bed in properly, and reduce effectivness.