I had all of the disks and pads changed on my '10 XKR a couple of months ago and wondered if this is normal or my mechanic has used cheap disks as I don't remember my old ones getting rusty like this.




I don't think I have driven it in the rain since they were changed so this is just from washing it a couple of times.

 

It's normal for cast iron rotors to develop surface rust from humidity in the air if the car isn't driven every few days. Surface rust isn't a problem because it will be removed as soon as you start driving and use the brakes. But if your car sits for a month or longer without being driven, that rust can get deeper and damage the rotors to the point where they'll need to be resurfaced or replaced.

Actually, your rotors don't look too bad. It's your rotor hats that are covered in surface rust. That won't affect brake performance. You can paint those hats with a high quality high temperature spray paint.

 

Yep it's normal for the Jag/OEM rotors to rust in those areas, mine did on my XFS, XFR and F-Type.
Coz Jag or whoever supplies them to Jag does not paint or coat those areas they are left bare metal, unlike most after-market ones.
I have coated or painted all of mine and zero problems since.

 

Thanks. Yes it was the hats I was talking about. I did a walk up and down the line at the car and coffee club this morning and didn't see one single car with rusty hats but they were all non-Jags.

I don't remember it happening on my old rotors, just the disk surface after washing if I didn't go for a drive afterwards but I expected that.

It is strange I didn't notice it on the old ones as it is very obvious on these but maybe they were different rotors or had aged more uniformly after being on the car for many years.

 

Thanks. I very much doubt they are OEM but I will wait and see how they age before going to the hassle of taking each wheel off and painting them. The rust will probably darken over time and look OK once it more uniformly covered the whole hat.

 

Don't leave it too long. On the rears on the F-Type (after-market not OEM) I tried to polish out the rust (to then clear coat to match the fronts) but it just would not budge no matter what type of polish I used or what tools I used, so I ended up just painting them black with gloss caliper paint. The rears rusted much more/worse than the fronts because I left them off the car and sitting out in the shed for a couple of years before eventually fitting them while the fronts were on the car and cleaned regularly.
If I were you I would clean off as much of the rust as you can then paint them black with caliper paint, it will last forever with zero fade or degradation.

 

You could also use grey or silver paint. I reckon you’re right and they’re aftermarket. Every OEM and factory fitted ones I’ve had were coated entirely, hats, rotor surface, vanes, etc with a grey coating, Zinc, I think.

 

Light SURFACE rust is common especially after washing if the vehicle is not then driven and, as stated by several members above, not an issue other than being unsightly. However, if there is PITTING it's is an indication of a poor casting and needs checking.

There's some good aftermarket brake discs available but there's also a lot of poor quality rubbish.

Graham

 

POR15 makes a great spray paint....just saying.

 

The jaguar-boxed discs I've bought (two sets) for my XKR both came with the central "hats" painted a light grey (typical ATE colour). I believe that the discs that were on my car when I bought it 3 years old and 16000 mile in were factory originals and looked like the had the same paint but had started to discolour a little. I would therefore expect that factory originals were painted. Most aftermarket disc are painted these days For example if you look at TMD, they have the Textar, Pagid and Mintex brands (plus some others) The Textar and Pagid discs are usually painted. The Mintex ones so far usually aren't but are cheaper. If I have discs that aren't painted, I just put a couple of coats of Hammerite. It seems to hold up for a few years quite well. However, to save on the extra work, I usually buy painted ones.

 

Deleted repeat post.

 

I think you are right and the OEM discs have painted centres/hats, I was wrong a few posts ago when I said they are not painted, I got mixed up with the after-market discs I bought (Hart brand) for the XFR then transferred to the F-Type. That said the Hart discs have been fantastic and still look and perform like new after 1.5 years on the XFR and five plus (fronts) and three (rears) years on the F-Type.

 

The paint is no guarantee of good quality. They just look newish longer.

My experience is that disc lose their friction with increasing numbers of corrosion cycles. Well used cars that never have more than very shallow surface rust extend the life of their discs. Mine get left standing too often and the discs deteriorate. But if you change yourself, it isn't a big deal to replace when they feel bad (weak or rough) even if there is still meat on them.

 

YES - here's the OEM replacement on my X150 showing the light gray painted centre and outer edge with the quality control OK stamped on the surface:





A Jaguar Dealer in Scotland was clearing excess stock at 99 UKP a pair including P&P or I'd probably have gone aftermarket.

Graham

 

The guy who service my car now has a dedicated parts person so I suspect he sourced the disks locally rather than importing from one of the usual suspects in the UK.

I am going to drop by tomorrow and have a word with him to see where they came from and if they have used those disks before. I didn't pay main dealer prices but they weren't cheap so I am fed up they look so bad already.

 

Mine still look new and shiny 2.5yrs after fitting.

That said they were £3k GBP!

Will be selling when car goes as will fit a set of 'chocolate' rotors for £200 and sell these for around £1000, the Wortec's are after all over 40lbs lighter than OEM so win in the all important unsprung weight stakes and the only X150 in the world with them fitted

 

I like your anti-rattle clip delete mod!