Rear disc corrosion

Wheels, Tyres, Suspension, Chassis, Faults and Fixes
Jeff123
Posts: 261
Joined: Tue Dec 24, 2019 9:13 pm
Location: UK

Re: Rear disc corrosion

Post by Jeff123 » Thu Jun 24, 2021 5:51 pm

As mentioned, my current Jaguar ones see to be lasting better than OEM BMW ones. On the BMW, I changed the lot, discs/pads, front/back at 3 years and 48k miles. By this time they looked (cosmetically) shot and they were vibrating when braking. After maybe a year or so, the new ones went very much the same way as the previous set and this was one of the reasons why I changed the car.
XE R-Dynamic 180d Eiger Grey MY20

Hillmangt
Posts: 226
Joined: Thu Oct 10, 2019 2:58 pm
Location: Purley, Surrey, UK

Re: Rear disc corrosion

Post by Hillmangt » Thu Jun 24, 2021 6:21 pm

My 20 year old merc is still on its original rear discs at 88000 miles. I have just serviced them and discs were hardly worn only showing some minor pitting. The new pads (Mintex) have cleaned them up to a pristine surface.
I think the Jaguar discs are just not suitable for this country with the rain and salt etc. My rears changed at 17000 miles and one front one showing some edge corrosion. I think the lack of use during lockdown has made it worse.
I will fit non OEM discs when change is required but keep the Jaguar pads to minimise the brake dust.
Andy
XE 2.0t 200PS Auto Prestige, Italian Racing Red, 2015. Every extra available except sunroof I believe.
Mercedes C320 Elegance Auto. Petrol. Eibach springs. Twin K & N Filters. Staggered 18 in replica AMG wheels. 2001.

RoJo
Posts: 1141
Joined: Tue Nov 06, 2018 9:26 pm
Location: West coast of Scotland

Re: Rear disc corrosion

Post by RoJo » Thu Jun 24, 2021 7:56 pm

I'm leaning towards the hypothesis that the issue lies with the makeup of the pads. If the pad material is more brittle than normal pads, then a normal wear issue such as a ridge at the edge of a disc, might remove more pad material than "necessary" and so propagate the sort of edge in corrosion we typically see.
Currently a Caesium Blue 30T Portfolio
Previously a Corris grey 25D R-sport

Phil
Posts: 451
Joined: Tue Feb 02, 2016 11:19 pm
Location: Monmouthshire

Re: Rear disc corrosion

Post by Phil » Thu Jun 24, 2021 11:56 pm

I believe the problem is with the distribution of clamping force by the caliper - on light application they seem to pinch from one edge and don't start aggressively cleaning the disc over the full width until they are leant on with gusto.

The brake size is pretty well specified for the mass of the car and during comfortable Jaguar driving I just don't think they are seeing hard enough use - worse on the rears where less braking force is required and therefore applied. You might be surprised how effective the occasional "Italian Tune-up" can be at keeping them in shape :)

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Fighterpilot
Posts: 601
Joined: Sun Aug 16, 2020 10:48 am
Location: NW

Re: Rear disc corrosion

Post by Fighterpilot » Fri Jun 25, 2021 8:06 am

Part of the car's working is for the rears to apply slightly with the way the car is driven. The brakes on the XE are excellent and the discs are sourced from BREMBO. The pads are hard but suitable for general use and do not need heating up to get top performance. You will notice the lack of dust compared with other cars as the braking material is different.
R Sport 180D 2015

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bik3rz
Posts: 22
Joined: Sat Jun 19, 2021 9:24 pm
Location: Northants

Re: Rear disc corrosion

Post by bik3rz » Fri Jun 25, 2021 11:27 am

On my prev jag, xf, i was on ebc discs and ebc red stuff pads. No rust issues, ever.

Will see how xe current ones hold, plenty of life in them, so will see...
current -> 2017 XE R-Sport, 2.0d/180 in caesium blue with black pack over black interior, black 19" 5031's
---
sadly gone -> 2012 XF Premium Luxury, 3.0 ds/275 in ultimate black over barley interior, dark grey 20" dracos

Hillmangt
Posts: 226
Joined: Thu Oct 10, 2019 2:58 pm
Location: Purley, Surrey, UK

Re: Rear disc corrosion

Post by Hillmangt » Fri Jun 25, 2021 5:53 pm

I tend to agree with Rojo with Reference to the pads and if his experiment proves conclusive maybe we just need to change pads and live with the increased amount of brake dust. I did clean the rust from the front disc with a flap wheel quite easily but i has returned indicating that the pad edge has been worn down by the rust and is not flush with the disc. I am using my car more often at the moment so will monitor the edge.
Andy
XE 2.0t 200PS Auto Prestige, Italian Racing Red, 2015. Every extra available except sunroof I believe.
Mercedes C320 Elegance Auto. Petrol. Eibach springs. Twin K & N Filters. Staggered 18 in replica AMG wheels. 2001.

RoJo
Posts: 1141
Joined: Tue Nov 06, 2018 9:26 pm
Location: West coast of Scotland

Re: Rear disc corrosion

Post by RoJo » Fri Jun 25, 2021 6:43 pm

All I can say is I'm very pleased with the visible improvement so far. Maybe I'd have got the same improvement with OEM pads but at around 1/3 the cost these Apec pads are certainly resurfacing the discs.

Front disc before;

IMG_20210515_095036.jpg

And now;

IMG_20210624_200009.jpg

I'll post up the rears after some more miles.
Currently a Caesium Blue 30T Portfolio
Previously a Corris grey 25D R-sport

Hillmangt
Posts: 226
Joined: Thu Oct 10, 2019 2:58 pm
Location: Purley, Surrey, UK

Re: Rear disc corrosion

Post by Hillmangt » Fri Jun 25, 2021 11:30 pm

That is a marked improvement. The Jag discs don’t seem as bright as others. All my other cars have had very bright surfaces on them. Thats the reason I questioned the steel used.
Andy
XE 2.0t 200PS Auto Prestige, Italian Racing Red, 2015. Every extra available except sunroof I believe.
Mercedes C320 Elegance Auto. Petrol. Eibach springs. Twin K & N Filters. Staggered 18 in replica AMG wheels. 2001.

RoJo
Posts: 1141
Joined: Tue Nov 06, 2018 9:26 pm
Location: West coast of Scotland

Re: Rear disc corrosion

Post by RoJo » Sat Jun 26, 2021 2:56 pm

Took it for a spin earlier and did some high speed braking (where safe to do so, in a NSL area) so new pics after that;

Front

IMG_20210626_144609.jpg

Rear

IMG_20210626_144619.jpg

Rear before new pads

IMG_20210612_163758.jpg

Currently a Caesium Blue 30T Portfolio
Previously a Corris grey 25D R-sport

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