With regenerative braking, I suspect the rear brakes are hardly used. I would find a quiet road where you can drive at a decent speed and brake violently a few times, enough to warm the discs up and clean off the surface corrosion.

I must say, although it might a trick from the big gaps in the alloys, that I have never seen discs go so rusty, so fast as on mine.

Just proves that they don't come into action very often ?

Hence my suggestion to go out and perform some heavy braking. In normal use the regen braking will not be using the rear brakes.

You can't post photos, but you could post a link.

I don't disagree with what the finance company have said, but would suggest to Vauxhall UK that they're knowingly selling something that isn't of merchantable quality

Has the warranty changed now?, as I was under the assumption pads and discs were wear and tear and not warranted, callipers probably but not pads-discs. also scored could mean anything and if the brakes are MOT passable I can`t see the problem?

No, the warranty hasn't changed and the discs would definitely be considered wear and tear. However, the product being sold still has to be of satisfactory quality, including a reasonable level of durability. It is reasonable for a brake disc to last at least 20,000 miles and probably more like 50,000 on any car. On a car that costs £30,000 the higher end of the range would be more reasonable, and 7,000 is definitely not.

Either the dealer is lying about this 'dangerous' scoring to try to make easy money or they're selling a sub-standard product.

Depends on use as you know, with some heavy braking you may not get 10k out of discs or pads so to assume its reasonable to expect a certain mileage I would disagree, but then we haven`t seen the scoring yet so may not be as bad as made out. But I certainly wouldn`t expect 20k from discs, If I got that I would be pleased, but never got that from any car.

About 30 years ago I was given a pool car (a Peugeot 309) and immediately noticed that the brakes sounded like metal-to-metal contact. The car had about 16K on the clock IIRC. None of my own cars have ever worn pads (pads went first back then) at that rate, but it shows what can happen to cars driven by non-owners.

I drove about 100 miles each way using engine braking as much as possible :-)

It is reasonable for a brake disc to last at least 20,000 miles and probably more like 50,000 on any car.

Depends on use as you know, with some heavy braking you may not get 10k out of discs or pads so to assume its reasonable to expect a certain mileage I would disagree, but then we haven`t seen the scoring yet so may not be as bad as made out

But I certainly wouldn`t expect 20k from discs, If I got that I would be pleased, but never got that from any car.

I think Hyundai (and Kia) say this about wear and tear items.

www.hyundai.co.uk › owning › 5_year_warranty

Exceptions to the Hyundai 5 year unlimited mileage warranty. ... Clutch disc, 24 Months, 60,000 Miles. Brake Friction Linings, 24 Months, 20,000 Miles.

It is reasonable for a brake disc to last at least 20,000 miles and probably more like 50,000 on any car.

Depends on use as you know, with some heavy braking you may not get 10k out of discs or pads so to assume its reasonable to expect a certain mileage I would disagree, but then we haven`t seen the scoring yet so may not be as bad as made out

But I certainly wouldn`t expect 20k from discs, If I got that I would be pleased, but never got that from any car.

I used to drive 20k miles to work per annum plus trips to go caving and walking. My brake discs and pads usually lasted 2 or 3 years. May be even more for the discs. I had new discs fitted to the front of my 2006 Sorento 2 years ago and they're possibly starting to warp a bit now after 20k miles of relatively short trips in a vehicle weighing 2 tons.

Well I'm replying about your comment that you wouldn't expect brake discs to last more than 20k miles. I've had a variety of cars and never had brake discs last less than 30k miles. Whether or not it's a Corsa is irrelevant.

In fact I'd expect the rear discs on a light car like the Corsa to last considerably longer than the front discs on a heavy car like the Sorento.

Edited by Crickleymal on 12/08/2022 at 01:03

It is reasonable for a brake disc to last at least 20,000 miles and probably more like 50,000 on any car.

Quite so.

Depends on use as you know, with some heavy braking you may not get 10k out of discs or pads .........

All that 10k presmably being on a race track.

But I certainly wouldn`t expect 20k from discs, If I got that I would be pleased, but never got that from any car.

You must be a very, ahem, unusual driver. On all our family cars (Passats, Focus) we got around 50k from the pads and around 100k from the front discs. Never had to replace rear. Current cars; Triumph TR7, has 72,000 miles and original front discs. Big heavy Audi A8 on 73,000 miles - replaced original front pads a couple of thousand miles ago - still has original discs. Rear discs and pads - original.

Small ridges can appear very soon on discs - they are of no consequence, but unscrupulous garages can draw attention to them and persuade unnecessary renewal. After around 50k I used to remove them, hammer off the rust (ram an old screwdriver into the vents) and run a carborundum wheel over them to clean them up and smooth off any ridging. I found this carborundum honing also works if they develop juddering, owing to areas of the disc developing different coefficients of friction (some mechanics call it 'warping' - but as any fule kno discs don't warp).

If you come to a stop and leave your foot on the brakes, this can lead to transfer of pad material onto the hot disc. Next time you brake, this spot has lower friction and a result is higher disc wear on the rest of the disc. The uneven surface then causes the "warped" feeling.