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MG MGF Technical - Worn rear brake disc

MY Fhas failed the mot due to excessive corrosion on the inside of the n/s/r brake disc.
On inspection I have found that only half the brake pad is in contact from the middle of the disc braking surface to the inside of the disc. The other half has the corrosion. Has anybody had this problem.
K Baird

Have you recently changed the pads?

Mick
M F Anderson

Haven't had chance to go under yet but my MOT last week 'advised' that inside edges of front disks were beginning to corrode and that front pads were getting low. "No MOT problem yet but beware". Obviously the pads are not (or perhaps never do) touching the full surface.

Will fit new disks and pads in next couple of weeks as soon as time allows.
JohnP

John,

What is the inside edge?
Is this the inside disc face (pad rubbing area), or is it further in where the disc is mounted (inside edge as opposed to the outside egde or rim)?

Mick
M F Anderson

Mick
Taking the disk as having 2 surfaces then it is the surface rubbed by the inboard pad - or so the mechanic said at the time (as you see I've not been under yet).
JohnP

The inside pad is always going to wear sightly more than the outboard due to the piston being located behind it.
I had a similar problem a few months back, but it became apparent by a loud screeching noise where the edge of the pad material had worn away and the backplate was touching the disc.
You may also be suffering from a stuck caliper where all the wear will be on the inboard pad as you have, and corrosion will be on the outboard surface as the pad is not rubbing against it.
New set of pads isn't too expensive and can easily be done yourself, you should also be able to check if the caliper has siezed. If your worried about disc thickness see if you can get hold of a micrometer and measure the thickness. I am not sure what the minimum is but I am sure some of the more learned people on here can let you know!
R Baker

This thread was discussed between 29/03/2003 and 31/03/2003

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