Mk7 Golf GTI - severe scoring of rear discs
Discussion
thats surface rust without a doubt. chances are the reverse face is in a worse state.
i had the same on my mk2 golf,simply by not using the brakes enough.
it is still in the early stages and can be got rid of in short order by using brakes more,or what i did was apply handbrake lightly,for a short distance,at high speed,say when leaving the motorway- obvs. when no-one else is around.
i had the same on my mk2 golf,simply by not using the brakes enough.
it is still in the early stages and can be got rid of in short order by using brakes more,or what i did was apply handbrake lightly,for a short distance,at high speed,say when leaving the motorway- obvs. when no-one else is around.
OP same thing happened to me, it was a BMW. A friend of mine had the same happen to his BMW. Both of us had M brakes. BMW's default response was new pads and discs, neither covered by warranty (a joke one a 1 year old car). I had them redone but they weren't 100% afterwards. Mate went for a new set on 4 corners, it'd cost him over 1000 quid in total.
After a bit of research it looks like this is due to discs now being more ecologically friendly (same as paint being based on water mixed with s
t and panels being paper thin). I'd say this is a cover up for manufacturer's greed.
After a bit of research it looks like this is due to discs now being more ecologically friendly (same as paint being based on water mixed with s
t and panels being paper thin). I'd say this is a cover up for manufacturer's greed.Top pup said:
That isn't scoring, that's a layer of surface rust on the discs, the scores are where the rust is just starting to clear up. They would skim up a treat.
I think once the rust sets in it rubs the corresponding part of the pad away so the pad is only contacting shiny parts of the disc. The rust bands gradually get wider, as has happened on the edge of the disc shown.OPs car isn't very old but I wonder whether lack of servicing of brakes these days is responsible - I asked both a dealer and an indie about stripping and cleaning brakes on my Merc and neither would do it. I wished I'd tried getting them skimmed as the pads were reported as only 10% worn, although presumably you're supposed to fit new pads after skimming anyway.
CrutyRammers said:
If you really think that, then you shouldn't be driving on them.
But they're not. The discs look virtually untouched, wear-wise, and that scoring is a fraction of a mm deep. The brakes won't even notice. I'd do some hard stops and if it's fine, not worry about it, personally.
I meant, to polish them up. Braking performance is just great.But they're not. The discs look virtually untouched, wear-wise, and that scoring is a fraction of a mm deep. The brakes won't even notice. I'd do some hard stops and if it's fine, not worry about it, personally.
Sheepshanks said:
Top pup said:
That isn't scoring, that's a layer of surface rust on the discs, the scores are where the rust is just starting to clear up. They would skim up a treat.
I think once the rust sets in it rubs the corresponding part of the pad away so the pad is only contacting shiny parts of the disc. The rust bands gradually get wider, as has happened on the edge of the disc shown.OPs car isn't very old but I wonder whether lack of servicing of brakes these days is responsible - I asked both a dealer and an indie about stripping and cleaning brakes on my Merc and neither would do it. I wished I'd tried getting them skimmed as the pads were reported as only 10% worn, although presumably you're supposed to fit new pads after skimming anyway.
The problem seems to be the larger brakes fitted to modern cars, higher iron content in the discs, and a lack of heavy braking.
I don't know about the scoring, but it's not unusual for high performance FWDs to go through rear brakes first. The ESP uses them (individually) much more than you think to aid turn in and minimise understeer. My Megane RS250 Cup needed rear pads 10,000kms before fronts. It has nothing to do with Brake bias
Maxym said:
I meant, to polish them up. Braking performance is just great.
Do you regularly use the quick roadside car washes ?A works van was washed and then put away for a few weeks and the plastic wheel cap started to turn white and the brake pad edges all started crumbling.
The damage to the plastic was shaped like liquid runs, if your rear brakes don't get ,ugh use, which sounds right then this may be part of it ?
The floors of the ones near me in Peterborough are ruined, at Homebase the concrete is all dissolved and only the pebbles remain.
Dave!
Welshbeef said:
If they are scored a hard workout will do nothing they will remain scored.
I don't believe they are scored but heavily glazed, hence the recommendation - feel free to read this very thread in between glasses of red. ;-)OP, just try a bit of emery cloth and see what happens.
Maxym said:
CrutyRammers said:
If you really think that, then you shouldn't be driving on them.
But they're not. The discs look virtually untouched, wear-wise, and that scoring is a fraction of a mm deep. The brakes won't even notice. I'd do some hard stops and if it's fine, not worry about it, personally.
I meant, to polish them up. Braking performance is just great.But they're not. The discs look virtually untouched, wear-wise, and that scoring is a fraction of a mm deep. The brakes won't even notice. I'd do some hard stops and if it's fine, not worry about it, personally.
Urrr, don't worry about it then?
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