Thread: new discs and pads.. now super noisy

If you can isolate which side is the noisy side, then try a new set of caliper pistons and seals. I have had a very noisy LHR caliper on my RR and new pistons and seals fixed it as it was horrific. I would say that in my case the fault was 1 sticking piston that would apply force to 1 side of the brake pad when applied. anyway, I had tried pads, discs, antisqueal shims bla bla and this was THE fix.

JC

Digging a bit deeper.

The cups in the wheel bearing may have some very faint chatter marks around them and they can only be seen when the bearings are washed spotless, then the light needs to be at the right angle to see those marks.

If there is noise from there, it gets transported to the discs and so on it goes.
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My experience with squealing brakes is that the rears always squealed after driving for a while on dusty roads.

If I used the brakes a few times, the squeal would gradually disappear and would only return if I drove for a km or two on a dusty road without using the brakes.

When I bought some new front pads recently, I asked about anti squeal shims or adhesive. I was told that the only thing needed was the film of rubber on the back of the pads they supplied. I think they were Bendix. He claimed that anything else was likely to create problems rather than solve them.

Recently the rear brakes started squealing much worse than they had ever done before and no amount of braking reduced the noise.

When I dismantled the brakes, I found that one of the shims had been dislodged a bit and appeared to have been making contact with the pistons in a couple of slightly different places and the coating on the shim was chewed up a bit. The shim would not have been making contact across the full surface of the piston.

I glued the shims to the pads so that they couldn't move at all and refitted them and the brakes haven't squealed since, except briefly when I drive on dusty roads.

The only explanation I can think of is that the chewed up shim was allowing the pad to vibrate and that the movement of the shim was preventing good, firm contact with the piston.

Anyway, the quite alarming squeal that had appeared quite suddenly disappeared, so I'm happy. I'm not sure if any of that helps you though.

Originally Posted by BST4X4XFA

Hi there Chris,

Changed the pads on my TD5 as they were getting to the end of their life. The elcheapo's squealed like crazy, replaced with Bendix 4x4 pads and it still squealed. I had to get my rotors machined to get rid of the glazing.

I know you mentioned that you fitted new rotors and pads. If the first set of pads glazed the rotor then it will keep on squealing even with proper pads. Have a look at the braking surface of your rotors.

Hope you can silence it soon.

Cheers, Jurgens.

I purchased some rear Bendix pads for my Disco months ago but haven't fitted them yet. Can't be long before I will need to fit them.... Hopefully this doesn't happen to me! I'll try remember to post back here with results anyway.

Originally Posted by justinc

If you can isolate which side is the noisy side, then try a new set of caliper pistons and seals. I have had a very noisy LHR caliper on my RR and new pistons and seals fixed it as it was horrific. I would say that in my case the fault was 1 sticking piston that would apply force to 1 side of the brake pad when applied. anyway, I had tried pads, discs, antisqueal shims bla bla and this was THE fix.

JC

Im pretty sure its both sides at the rear.. il check today though.

Sounds pretty plausible that this could be the issue, only thing is On my Defer there is only one piston per pad at the back... so two per caliper. So Im thinkin that even if its sticking slightly it is still going to push square?

Originally Posted by wrinklearthur

Digging a bit deeper.

The cups in the wheel bearing may have some very faint chatter marks around them and they can only be seen when the bearings are washed spotless, then the light needs to be at the right angle to see those marks.

If there is noise from there, it gets transported to the discs and so on it goes.
.

Im pretty sure it is a brake squeal noise.. its a pretty recogniseable noise!

Originally Posted by chris_mack

Im pretty sure its both sides at the rear.. il check today though.

Sounds pretty plausible that this could be the issue, only thing is On my Defer there is only one piston per pad at the back... so two per caliper. So Im thinkin that even if its sticking slightly it is still going to push square?

Same system as the RRC, 2 pot rear calipers. It doesn't have to be much of an uneven amount, either. When I overhauled the caliper the pistons came out easily and weren't leaking but were definately pitted and near the outer edge the chrome face was flaking off.

New pistons and seals and silence

JC

Excellent... il look into that monday then. Iv never changed pistons before, anything i need to know or is it all pretty straightforward ?