Brake grinding noise

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TB2
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Brake grinding noise

Post by TB2 »

Hello everyone.

Everything going well at the moment, generally speaking, after my BX hat a major leak a few weeks ago which was promptly fixed by my stealer because I was quite busy at the time (just a blown off pipe at the front height corrector). Spring is coming up (finally...) and I'd like to put on my shiny refurbished Swift2 rims which I've spent so much work on. The problem remains that the rim offset is different to the regular (GTI) rims for some unspeakable reason. I'll either need to get distance plates (which are illegal) or sell the current 195/65 tyres, which is pretty stupid as they're new, and get smaller ones.

In any case, I still have the problem that the rear right brake makes a grinding noise each revolution. (As in, if I drive faster, it's there more often), and I've taken the wheel off today and found the following. On this picture you can see a dark spot on the brake disc. That's the part that makes the grinding noise every time it passes through the brake pads.

Image

Has anyone seen something like this before, could I fix it myself (by just grinding it off or something), or should I be replacing the brake disk?

Thanks!
Carl

1989 TRD "Entreprise" Turbo Diesel
1989 16 Valve
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Tim Leech
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Post by Tim Leech »

I would just clean it up, use some emery cloth and brake cleaner and that should cure it.
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ken newbold
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Post by ken newbold »

Yes you could clean it up as a bodge, but if you're keeping the car I want to replace those rear discs, assuming the other side is in the same condition as this one.

Have you checked the inward face of the disc, they're usually worse than the outward face.

You are loosing a third of your braking surface on this side alone, if the other side is the same and the inward sides are the same, your braking efficiency is well down. :(
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MULLEY
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Post by MULLEY »

Could there possibly be some air in the rear brakes, hence why the discs look well shot & don't appear to have much of the brake contact patch touching the disc?
2002 C5 2.0 HDI Estate - Jasmine - Now SORN
2011 Mini Cooper D Clubman - SOLD
2016 Mercedes A180D Sport - Auto refinement
1992 TZD Turbo - Bluebell - My daily
1991 Gti 16V - Blaze - crash damaged, will get repaired.
1990 Gti 8Valve SOLD - looks like it's been scrapped
2002 Mini Cooper S - SOLD - i miss this car
1992 TXD - Scrapped in March 2014
1988 CX 25 GTI Turbo2 - SORN
1996 - AX Memphis 1.5D - Dream - SORN

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TB2
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Post by TB2 »

Mhh, I see. After reading some stuff about break discs and how they look like after different types of damage, mistreatment or similar, I'm guessing that mine might look like this because the car stood for a very long time (possibly as long as 10 years) in which time the discs caught rust and upon reusing the car, the rust particles have grinded these groves into them. In any case, it seems like I should replace them. I'll look into how to do that. Hope I find the time. Is it very difficult? :|
Carl

1989 TRD "Entreprise" Turbo Diesel
1989 16 Valve
---
Parts needed:
- One black leather headrest.
- FDV overhaul kit (95.669.034)
Please contact me through PN if you have any of this.
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My Cars: 1999 Xsara LX 2.0HDI (90) Hatch - Fern
2002 C5 2.0 HDI (110) Estate - Jasmine - SORN
2011 Mini Cooper D Clubman - SOLD
2016 Mercedes A180D Sport - Auto refinement
1992 TZD Turbo - Bluebell - SORN
1992 TZD Turbo Estate - SORN
1991 Gti 16V - Blaze - crash damaged, will get repaired - SORN
1990 Gti 8Valve SOLD - looks like it's been scrapped
2002 Mini Cooper S - SOLD - i miss this car
1992 TXD - Scrapped in March 2014
1988 CX 25 GTI Turbo2 - SORN
1996 - AX Memphis 1.5D - Dream - SORN
x 8

Post by MULLEY »

I've managed it, so i'd say no :D The biggest problem is probably having to replace the rear pads (getting them out is a problem as everything is probably seized up), if they have gotten uneven wear on them because of the rusty discs, then you'd probably be best replacing them as well. An alternative would be if there is plenty of meat on the pads, you could always sand them down flat & re-use them with your new discs.

I also had really rusty rear discs, i chose to take them off, take a hammer to them to get all the rust off, bit of sanding & then i popped them back on. I'll replace them for the next mot, or if they pass i'll do them in the summer when conditions are nicer for outdoor work.
2002 C5 2.0 HDI Estate - Jasmine - Now SORN
2011 Mini Cooper D Clubman - SOLD
2016 Mercedes A180D Sport - Auto refinement
1992 TZD Turbo - Bluebell - My daily
1991 Gti 16V - Blaze - crash damaged, will get repaired.
1990 Gti 8Valve SOLD - looks like it's been scrapped
2002 Mini Cooper S - SOLD - i miss this car
1992 TXD - Scrapped in March 2014
1988 CX 25 GTI Turbo2 - SORN
1996 - AX Memphis 1.5D - Dream - SORN

I'm not just a username, i'm also called Matthew.
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Post by Defender110 »

Looking at that I would check your rear caliper isn't siezed, a brake that is working properly would soon clean the disc up.
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