Discovery 5 Brakes

[OJAY]

I’m interested in opinion here. One of our cars is a Discovery 5. It’s 2 years old, has done 10,000 miles and we love it - it’s the latest in a long line of Land Rover cars that we have owned, mostly with no problems at all. So, the miles are low, but not that low, we have other cars to potter around in as well. The brakes recently started to judder awfully and so the car went in to the Land Rover dealer yesterday. I was less than impressed to be told that the brakes are warped owing to heavy corrosion and need to be replaced all round at a cost of GBP1300. When challenged that this is ridiculous for a two year old car, we were told directly that it was our fault for not having accumulated a higher mileage. I smell a vague waft of BS and have read elsewhere that the brakes used by LR are of very poor quality metal and so prone to corrosion warping - that strikes me as something not being fit for purpose and so should be covered by warranty. I have a number of other fun cars - including an AM and a Ferrari - which do maybe 5,000 miles a year each and never throw up an issue like this. Thoughts?

[MetalMatters]

Virtually no such thing as warped discs, it’ll most likely be soft brake pad deposits on the discs.

https://alconkits.com/support/brake-pad-info/110-t...

[lexusboy]

How long did you drive with the judder?

As above it’s most likely pad deposit on the disc. Being stood for a while in rain etc isn’t great for brakes.

Might be worth just driving it for a bit with some heavy hard braking to try and clean them up otherwise you’ll be paying for new pads and discs unless you get the discs lathed

[Throttle Body]

I can't really see how corrosion causes discs to warp. They are two separate things, surely?

You might want to get a trusted independent L-R garage to take a look. The trouble is that many L-R dealers are untrustworthy.

[stevemcs]

For some reason jlr cars seem to suffer really badly with rear brake corrosion, the discovery sport and xe being bad. The lowest mileage we have seen is 7000 on a disco sport. Sometimes the dealer will replace them under warranty.

If you mix and match you should be able to get the discs from the main dealer and then the pads from ecp, fit genuine or Brembo or ate

You should be able to do it for around £500 or less for the front.

[The Wookie]

MetalMatters said:

Virtually no such thing as warped discs, it’ll most likely be soft brake pad deposits on the discs.

https://alconkits.com/support/brake-pad-info/110-t...

I’ll be looking into whoever has posted that with our brand name attached to it as it’s paraphrasing a (wrong, and old) stoptech article that has ironically created one of the biggest and most pervasive myths about judder.

Rotors can and do distort In a fashion that would reasonably called warping and, although it’s not often the cause of judder by itself, can lead to disc thickness variation which subsequently causes torque variation which IS the main cause of brake judder. Uneven pad deposition also causes torque variation.

OP if the parts aren’t fixed by a good bedding cycle (which would clear off any corrosion) then there is something wrong with the brakes on your car, don’t be fobbed off just because the dealer doesn’t understand it.

There are a number of potential root causes, likely nothing to do with disc material quality but more likely out of tolerance components whether it be disc inner diameter clearance to the hub, caliper seal groove shape or simply discs with too much runout from the factory. It could also be faulty batch of pads.

If the judder occurred after you took the car for a longer motorway run then that would pretty much confirm it’s a tolerancing or caliper issue.

It is the sort of thing JLR should be pushing the brake manufacturer to investigate and fix, otherwise you could risk ending up throwing parts at it until it stops.

Edited by The Wookie on Wednesday 19th August 00:28

[OJAY]

Thanks everyone. The dealer isn't moving and we're going ahead with the work - but the reaction when we asked for the removed brakes to be returned to us was not friendly. We'll get someone to take a look at the removed brakes once replaced.

[TarquinMX5]

OJAY said:

Thanks everyone. The dealer isn't moving and we're going ahead with the work - but the reaction when we asked for the removed brakes to be returned to us was not friendly. We'll get someone to take a look at the removed brakes once replaced.

I wonder why, maybe because they will definitely have to remove them