Rear brake squeak

[davelittlewood]

Hello,

Got a 1/rev squeak on the right rear disc. Pulling on the hand brake stops it.

Discs are not very worn so I don't want to have to replace both discs.

I'll measure and clock the disc tonight.

I thought that discs would only be prone to warp when they had significant wear??

If it is warped is it OK to get them skimmed to true it up (would I have to do both sides?)

I'd be surprised if it is warped as I haven't taken it on the track so I can't have put much heat into the discs??
Flaw in the disc casting??

Any advice,

Cheers,
Dave

[QBee]

small stone stuck to the pad?
The spring or wear indicator just touching the disk, and the disk very slightly out of shape?

[Aussie John]

Had a scraping noise on mine, it turned out to be the hub that the wheel bolted to was running out, a slight skim and all is well.

[ChimpOnGas]

I've got a rotational squeak coming from my rear near side hub area, it's like a cricket sat chirping away on the rear upright. I diagnosed my noise as a worn CV joint, maybe its the same for you and nothing to do with the brake?

Gently accelerate and decelerate to monetarily load up the CV joint, if you can lose the squeak it's likely to be CV joint related, pulling on the handbrake on the move will likely have a similar effect.

I'm not suggesting your noise is definitely CV joint related, all I'm saying is don't rule out the CV joint by convincing yourself it absolutely must be down to the brake.

Worth checking

[QBee]

ChimpOnGas said:

I've got a rotational squeak coming from my rear near side hub area, it's like a cricket sat chirping away on the rear upright. I diagnosed my noise as a worn CV joint, maybe its the same for you and nothing to do with the brake?

Gently accelerate and decelerate to monetarily load up the CV joint, if you can lose the squeak it's likely to be CV joint related, pulling on the handbrake on the move will likely have a similar effect.

I'm not suggesting your noise is definitely CV joint related, all I'm saying is don't rule out the CV joint by convincing yourself it absolutely must be down to the brake.

Worth checking

Good call Dave. CV joints do wear out on these cars, I guess because they were designed for a 150-200 bhp Ford, not a more powerful TVR

Can I just add that I had that "chirpy cricket" noise for weeks after my rear brakes were hastily reassembled. In my case it was the end of the tensioning spring just catching on the disk. You could identify it by driving with your foot gently on the brakes, which eliminated it.

[davelittlewood]

Clocked up both rear discs.

Left rear is 19.2 mm thick with 0.04mm run out.

Right rear is 19.2 mm thick with 0.45mm run out!!

Clocked up the inner face (the face that the wheel sits against), same run out.

There is also a small patch where the pad bound to the disc but the problem is the run out.
The discs have almost no wear so either there's a bit of muck under the disc, the hub face is on the piss, or the stub axle is bent

I'll take the disc off and clock up the face of the hub and measure the thickness of the inner part of the disc.

[davelittlewood]

0.35mm run out on the outer edge of the hub flange.

0.2mm run out on the very end of the shaft (in phase with the run out of the hub flange).

Bent drive shaft

Arse

[davelittlewood]

Hang on lads,

Am I being daft here?

The bearing seats on the outer diameter of the drive flange (the part with the splines that mates with the drive shaft)??

So it's a bent drive flange??? Not a drive shaft??

[ChimpOnGas]

davelittlewood said:

Hang on lads,

Am I being daft here?

The bearing seats on the outer diameter of the drive flange (the part with the splines that mates with the drive shaft)??

So it's a bent drive flange??? Not a drive shaft??

That would make more sense, have you clipped a curb?

[QBee]

Could it even be that the hub/bearing assembly is not properly tight, ie a loose nut?