Mk7 Golf GTI - severe scoring of rear discs

[Maxym]

Welshbeef said:

OP what is the disc thickness? Close to limit?

Don't think so; they're not significantly lipped

[nickfrog]

thebraketester said:

Honestly its not worth fking about with trying to sort out the parts you have on. Get some new discs and pads on it, they are cheap... especially if you buy them from SERE and fit them yourself.

I reckon deglazing them might involve far less fking about than changing them. Cheaper too.

[JakeT]

Sheepshanks said:

If you can do 80K miles without needed pads then you're not using the brakes much.

Edited by Sheepshanks on Wednesday 1st March 18:26

I've never changed a set of pads because I wore them out, a caliper usually seizes or the inner face of the disc gets too corroded before hand. I live in the middle of nowhere though.

[5harp3y]

I've had the same problem with my volvo but not scoring just mega rear wear.

Apparently the cruise control uses the rear brakes to control the speed on descents etc so is constantly nibbing the rears.

in 90,000 miles ive been through 4 sets of rear discs and pads! (and one set of fronts)

[Y Y Z]

I also had this problem with a previous car, pretty sure all these issues started when they stopped using asbestos in pads, I've had several cars where the pads outlive the discs which just isn't right, I don't know what they make them out of now.. iron filings and glass? but they don't wear like the old ones used to, anyway I solved my problem by finding a quiet lane and reversing at speed and braking hard quite a few times throwing all the weight on to the rear, it's a bit of a pain but it worked.

[thebraketester]

nickfrog said:

thebraketester said:

Honestly its not worth fking about with trying to sort out the parts you have on. Get some new discs and pads on it, they are cheap... especially if you buy them from SERE and fit them yourself.

I reckon deglazing them might involve far less fking about than changing them. Cheaper too.

Nope... doubt it. If the discs are like that, the chances are the pads are fked too.

Up to the OP.... my car, I would just change them.

[nickfrog]

thebraketester said:

Nope... doubt it. If the discs are like that.

We don't know what they're like - ie glazed or scored.

[thebraketester]

The problem is (from what I can see) that the pad is not cleaning/contacting the full surface of the disc. The OP could try just fitting new pads, but.... *see my previous post.

[liner33]

My Octavia VRS (Same discs) look much like that after frequent slow'ish trips or motorway journeys , once I drive it a little harder and get more heat into the brakes they quickly clean up

[nickfrog]

thebraketester said:

The problem is (from what I can see) that the pad is not cleaning/contacting the full surface of the disc.

Which tells me they aren't used hard enough and/or don't get hot enough and that they simply need a good workout, as per the previous posters feedback.

[Car_Nut]

Y Y Z said:

I also had this problem with a previous car, pretty sure all these issues started when they stopped using asbestos in pads, I've had several cars where the pads outlive the discs which just isn't right, I don't know what they make them out of now.. iron filings and glass? but they don't wear like the old ones used to, anyway I solved my problem by finding a quiet lane and reversing at speed and braking hard quite a few times throwing all the weight on to the rear, it's a bit of a pain but it worked.

I agree - my Mk 2 Golf GTI, which I bought new in 1984 was one of the first cars with asbestos free pads, and while it ran VW spec disks and pads, the rears always had a very wavy wear profile across them, very much like what is shown, but without the bands of corrosion (it was regularly driven hard on cross-country runs, with relatively few motorway miles, so no chance for corrosion to build up), and I regularly used to go through front disks every 18k to 20k miles, throwing away pads that were half worn, to the extent that I can now do a front disk change on a Mk 2 Golf in 20 mins a side. It now runs Black Diamond disks and Mintex pads all round and the wavy rear disk wear issue has gone away (plus it now only does a few hundred miles a year). I have always felt that asbestos free pads need a special technique - they need to be applied with a stamp to give maximum retardation - gently feeding them in seems to glaze the disks. Of course this is much less easy in these days of stupidly over-servoed brakes.

As others have said, drive the car with lots of hard braking from speed and the rust should go away, and then there is nothing to worry about.

[mikegti77]

I have almost exactly the same on my 63 plate GTI, both rear discs, though not quite as bad, 27k miles on car. It is weird, and appears no reason for it, but it does seem to affect GTI's in particular - non PP and PP. Never in 20 plus years of driving have I had this.

I have actually been sad enough to sit and look at autotrader advert photos for mk7 GTI's (those with close up's of rear wheels), roughly half of them show rust ring marks on the disc surface. It seems hit and miss, some are ok some are not.

I have purchased an odbeleven device to allow me to dis-engage the EHB so I can replace the rear brake pads to see if this improves matters. I can see on my car the inside of the disc and the pads are making full contact - no rust marks or scoring, just the outside of the disc.

As someone mentioned, Skoda Yeti's have a similar issue, maybe a VAG thing, who knows.

[VGTICE]

thebraketester said:

Nope... doubt it. If the discs are like that, the chances are the pads are fked too.

Yep, if the scoring/rust build up is how it is in the picture 99.9% pads will be fked too, especially if OP tried to clean the rust of the discs by hard braking.

[davamer23]

I have it on my 6300mile 15month old leased 208gti. I know what type of braking needs to be done with rear disc fitted cars and I didn't order a 208bhp hot hatch to drive it like Miss Daisy. Factor in that I live in Wales and therefore it's difficult to drive any distance without encountering a fairly steep downhill,plus despite the low miles I do use the car daily and is rarely sat for longer than overnight I'm perplexed as to why this issue has arisen on this vehicle and not on any of the other 6 cars I've previously owned that had rear disc brakes.
Peugeot don't want to know but would've considered changing them FOC had the car been sub 6000 miles. Convenient.
Car goes back to Peugeot in May as the lease ends so they can have it and it's rusty brakes.

[JakeT]

Occasionally a good stand on the brakes is needed to make sure that the pads give the disc a squeeze and clear everything off. reversing and braking hard can also clear off rear discs.

[Morningside]

Oddly my partners 2014 53k rear brakes are the same (TDI, DSG) but it has automatic brake and auto hold as well. Mine is a 2013 manual and the discs are smooth.

Also strangely it's only like that on the rear offside disc.

[RBH58]

5harp3y said:

I've had the same problem with my volvo but not scoring just mega rear wear.

Apparently the cruise control uses the rear brakes to control the speed on descents etc so is constantly nibbing the rears.

in 90,000 miles ive been through 4 sets of rear discs and pads! (and one set of fronts)

ESP too. Constantly. Rear brakes get used to aid turn-in and minimise understeer.

[Morningside]

RBH58 said:

5harp3y said:

I've had the same problem with my volvo but not scoring just mega rear wear.

Apparently the cruise control uses the rear brakes to control the speed on descents etc so is constantly nibbing the rears.

in 90,000 miles ive been through 4 sets of rear discs and pads! (and one set of fronts)

ESP too. Constantly. Rear brakes get used to aid turn-in and minimise understeer.

Cruise control Interesting...

[va1o]

Mine looked like this after 37,000 miles in 18 months



EDIT: This was on a 15-plate GTD DSG with adaptive cruise used extensively on the motorways.

Edited by va1o on Thursday 2nd March 18:26

[sidgolf]

va1o said:

Mine looked like this after 37,000 miles in 18 months



EDIT: This was on a 15-plate GTD DSG with adaptive cruise used extensively on the motorways.

Edited by va1o on Thursday 2nd March 18:26

this pic. shows the brakes are working ok.,just not being used quite enough to keep the discs free of rust.

as long as the corrosion is still just surface-rust,a few hard stops from time-to-time will eradicate it at no cost