[Arianne]

I agree dealers wording is important, but we did push the dealer on the issue, and they specifically said there was NO grooves on the discs but corrosion on the face of the discs, which to me is defective/sub-standard materials used in the manufacture of the discs, for this to happen within two years of manufacture.
If these are left, and come next year when the MOT is due, it will fail, and for a vehicle fail on corroded discs on its first MOT is wholly unacceptable.
I accept worn discs would not be covered under warranty and if a stone got stuck between disc and pad and damaged the disc, that would be unfortunate and we would have to cover the cost of replacement

I think that's fair enough. But can I ask, how bad is this corrosion? Surface corrosion is not unusual for a brake disc. This alone wouldn't result in an MOT fail, would it?

I don't mean to be frivolous, so be patient here, but my discs appear covered in corrosion and oxidisation if I wash the car and leave it to dry, rather than take it for a quick drive immediately afterward. It's been the same for all of my cars - JLR, Volvo, Ford and Vauxhall.

I assume the corrosion on your discs is something more severe, causing brake performance to suffer? Otherwise it wouldn't be an MoT fail?

Regards, Arianne

 

[Fenton]

That sounds terrible.
Have you had a look (or a second opinion) to check them - just to make sure your garage isn't being, how shall I say it, over-enthusiastic?
We all know discs will rust and if you leave a car parked in the wet for long periods they will start pitting.
If the corrosion is uneven has the dealer checked the callipers? The surface rust should get wiped off by the pads very quickly unless there is uneven pressure. (I have exactly this problem on my 4 year old Evoque, one disc is a bitt iffy, but certainly nowhere near worn out).

 

[Andyvelar]

Yes Corrosion on the disc surface would result in a MOT fail, even the dealer agreed that it would. We haven't personally seen the corrosion yet, but for the dealer to recommend them being replaced, I would assume it must be quite serious, and it will only get worse, knowing how quick JLR work I would rather get it sorted sooner rather than later before the warranty expires

 

[Arianne]

Yes Corrosion on the disc surface would result in a MOT fail, even the dealer agreed that it would. We haven't personally seen the corrosion yet, but for the dealer to recommend them being replaced, I would assume it must be quite serious, and it will only get worse, knowing how quick JLR work I would rather get it sorted sooner rather than later before the warranty expires

Understood. Thanks for the clarification Andyvelar. All the best with you discussion with the dealer and JLR. I hope you get a decent outcome. Let us know if you have the time to pop a post on the thread.

Arianne

 

[Jim55]

I had a VW Beetle many years ago, my first car, and it developed a corroded disc. The corrosion was caused by a faulty caliper, one pad was not being properly pushed on to the disc (fixed not floating calpier). This was because the car had been left standing for some time, a rust ring had formed between the piston and caliper. Due to the rust ring the pad/piston wasn't retracting properly causing the pad to wear away very quickly until it no longer was making contact with the disc. After the pad wore away was when the corrosion on the disc started to build up, i.e. it wasn't being scrubbed off by the friction every time I braked.

So I would expect if I was driving my car regularly and corrosion started to build up on the disc this would indicate the pad is not making contact with the disc, no friction scrubbing, and therefore it would more likely be a caliper fault and require the caliper, disc and pads to be replaced - typically as a pair across the axle to keep the braking effect balanced - as was required with my VW.

 

[Simonh]

Mine always squeal just before stopping after a wet night sat on the drive until they've been used a bit... is this normal ?

 

[Andyvelar]

I had a VW Beetle many years ago, my first car, and it developed a corroded disc. The corrosion was caused by a faulty caliper, one pad was not being properly pushed on to the disc (fixed not floating calpier). This was because the car had been left standing for some time, a rust ring had formed between the piston and caliper. Due to the rust ring the pad/piston wasn't retracting properly causing the pad to wear away very quickly until it no longer was making contact with the disc. After the pad wore away was when the corrosion on the disc started to build up, i.e. it wasn't being scrubbed off by the friction every time I braked.

So I would expect if I was driving my car regularly and corrosion started to build up on the disc this would indicate the pad is not making contact with the disc, no friction scrubbing, and therefore it would more likely be a caliper fault and require the caliper, disc and pads to be replaced - typically as a pair across the axle to keep the braking effect balanced - as was required with my VW.

That's interesting, we use the car regularly, so long standing is not an issue, but as all discs are showing corrosion on the inner faces, maybe there is an issue with the callipers and the whole braking system

 

[Pfalder]

Good luck because I had a similar problem with my last Jaguar and they refused to budge.
I had warped disks causing steering wobble on braking. They refused to acknowledge disks should not warp and claimed it was wear an tear. They are notoriously reluctant to admit fault.

 

[PickyP]

Anyone else had unusually quick brake wear? My October 2017 car just had its first service and I've been advised that it needs new discs and pads all round due to corrosion/pitting.

Pads fine but discs? Already? It's a £60k car...

Just had Discovery rear brake pads and discs replaced on advise from LR garage after a service and it’s 2nd MOT. Told discs were pitted and showing corrosion. The car has done 35,000 miles and is a 2021 vehicle- We bought it from LR dealership at 2 yrs old (during Covid) where it was supposed to have had full checks etc. IT had its first MOT last year.
Had our geared Audi 15yrs and it’s still going strong with no issues on brakes and pads. Find auto driving a bit frustrating as brake used a lot where as on a geared car you can change up and down as speed control mechanism - maybe that’s why replacement seems frequent?
Interestingly - two other guys in the showroom were also having discs and brake pad work and one said his wife’s Discovhad also had to have discs replaced not long after he bought it.
Coincidence or issue? .

 

[Maxfactor]

Plenty of other threads on these forums plus speaking from experience, highlighting that the discs are not fit for purpose under certain unknown circumstances. Cars a year old with 12k miles being presented back to dealerships with discs overly worn, corroded or warped. JLR’s response “does not affect performance and not covered by warranty as due to normal wear and tear”!
The dealerships are well trained now to not bother JLR on your behalf.
But also I now get my car MOT at Halfords as less chance they’ll make up advisories.