1.9 Gti Front Brakes - Abnormal Wear

[rutlandguy 0]

Hi,

 

Only had my GTI about a month and I'm new to the site. Done the usual search and waded through the post in this section but no one seems to have posted on the above.

 

My problem is that I have standard 1.9 brakes 247mm in diameter but they may as well be 235mm disc as the pads don't make contact al the way to the outer edge leaving a 5mm rust ring all the way round the out face of the disc front and back on both of the front discs. Does anyone know the cause. I'm guessing the wrong pads have been fitted (or cheap pattern parts) and would appreciate some advice so I don't make the same mistake when I replace the discs and pads.

 

I can post some pics if it would help but I think I have defined the problem clearly enough.

 

Regards

 

 

Phil

[jonah 1]

I've had the same on the rear brakes before - was caused by the design of the pads. The friction material was stepped down in thickness slightly a few mm from the outer edge of the pad. I presume they're designed like that so that if they're fitted to worn discs, the step will clear any lip around the edge of the disc. Once the pads have worn down slightly they make contact over the full surface, although I found that by that time, the rust ring had gone quite deep so it still hasn't fully worn away back to clean metal.

 

In your case it could also be that someone has fitted new discs to unevenly worn pads, or possibly that the pads are old and the outer edge has crumbled away.

[Ahl 4]

As Jonah says.

 

From memory, the pads don't go all the way to the edge of the disc as standard. 5mm unswept sounds about right.

[rutlandguy 0]

The 5mm pad unswept part of the disc round the outside - is this only a 1.9 GTI problem?

 

I ask as the photo in the post below (205 1.6GTI) clearly shows the whole disc being swept by the pad right to the outer edge:

 

http://forum.205gtidrivers.com/index.php?s...ndpost&p=557672

 

Any more thoughts anyone?

 

 

Phil

[Miles 331 1 Cars]

Could just be badly rusted calipers, Had a few like this. Give them a very good clean up and they should be fine with the new Pads etc

[rutlandguy 0]

Thanks for all the responses but the discs and a the pads are fairly new. The front pads are all in good shape (ie not flaking at the edge) and are about 1/2 inch thick.

 

I have enclosed a picture high-lighting the problem:

 

http://i62.photobucket.com/albums/h118/rut...ontdiscfull.jpg

 

You can plainly see the unswept area around the edge of the disc - I'm pretty sure this can't be normal.

 

I'd be grateful if if someone who doesn't have this problem and has standard 1.9 GTI brake could advise on what pads they are using.

 

 

Cheers

 

 

 

Phil

[Ahl 4]

Thats what the discs on my 1.9 are like and they have different calipers/pads again.

 

I think the picture you referenced to before show discs that are new or haven't rusted around the unswept area.

[jonah 1]

That definitely doesn't look right. I've had 3 different sets of pads on mine now since fitting 1.9 brakes (two grades of Mintex pads and some Lucas ones IIRC) and they have all reached to the edge of the disc. Do the edges of your pads line up to the edge of the disc? If not then all I can suggest is that they're the wrong ones!

 

The last set of pads I bought, when I took them out of the box, I thought they had a manufacturing fault because it looked like the block of friction material was misaligned with the backplate. It was actually overhanging the top edge of the plate by a few mm. But when I fitted them to the car, they lined up perfectly with the discs, so it must have been intentional. Maybe there's another car that uses similar pads with the same shaped backing plate but with the friction material positioned further inward (or just narrower) to match smaller discs.

[rutlandguy 0]

Just changed my Front pads for the genuine Peugeot part and just look at the difference in the size of the friction material no wonder the other pads left 5mm unswept on the outer edge of the disc.

 

 

I think the pads were sourced from Just GTI's and so no one else ends up ruining a pair of discs The manufacturer and part number are included below:

 

Manufacturer: ABTEX

Model: ABP270

Part No: 90R-01037/886

 

Don't buy them!