pitted and corroded brake discs

Wheels, Tyres, Suspension, Chassis, Faults and Fixes
MartinM
Posts: 16
Joined: Tue Jan 12, 2016 1:56 pm
Location: Hampshire

Re: pitted and corroded brake discs

Post by MartinM » Thu Apr 19, 2018 6:07 pm

I have just had my 2.0i Sport disc and pads replaced under warranty.
2 and half years old and just over 35,000 on the clock.

It was starting to suffer from lumpy brakes when cold and judder when thoroughly warmed up.
The outside of the discs were fine but the inside they were all badly corroded. The video sent to me from Harwoods whilst the car was on the ramp showed just how bad they were.
Never seen anything like this before on any of my many cars I have owned.

Cost of parts came to £322.24 - but nothing to pay as it was treated as a warranty issue.
200PS R-Sport in Ultimate Black with Jet Light Oyster interior. Added options = Sunroof, Split folding rear seats, lighting, parking & cold climate packs, Power fold mirrors and a spare wheel


Indianajons
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Location: Peak District, UK

Re: pitted and corroded brake discs

Post by Indianajons » Thu Apr 19, 2018 6:14 pm

Sounds like the inside pads had stopped making contact with the discs, otherwise the rust would have been polished off
2017 MY tempest grey Portfolio 180D, folding mirrors, 14 way seats, memory pack, cold weather pack, 360 parking, wi-fi hotspot


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Nevyn
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Location: Northamptonshire

Re: pitted and corroded brake discs

Post by Nevyn » Thu Apr 19, 2018 6:19 pm

Mine's going in tomorrow to have the discs and pads replaced under warranty. For the second time...

Picked up at the first service a week back. It's done 18.5k...
XE 180d Portfolio Auto. Ammonite Grey/Light Oyster. 19" Star 5 Twin-Spoke + lots of toys...
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Vespa
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Location: North West UK

Re: pitted and corroded brake discs

Post by Vespa » Fri Apr 20, 2018 8:14 am

A typical fault of non greased slide pin, and often missed in serivcing and renewal of pads.
180 diesel XE R Sport, with many extras :D


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BRC
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Joined: Mon Jun 25, 2018 8:01 pm
Location: Surrey

Re: pitted and corroded brake discs

Post by BRC » Thu Jul 05, 2018 9:02 am

Apologies for resurrecting a somewhat dated thread but years ago brake discs could and were "faced" i.e. machined back to flat. Obviously this had to be within the limits of the brake disc. Is this still practised by garages or are they always replaced as a matter of course?
Have to say there is a wonderful automotive machine shop my son has used in times past and I'd be amazed if they don't offer such a service.


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Madatter
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Location: Mansfield

Re: pitted and corroded brake discs

Post by Madatter » Thu Jul 05, 2018 10:04 am

I had to change the discs on my Mondeo at 7000 I got rid of it last week with 120000 with the same discs on I fitted 10 years ago, I don't know what they're made out off now days but I'm sure it's not metal😁
XE 2.0TD MY16 ULTIMATE BLACK Prestige, Cold Climate Pack, Parking Pack, Pan Roof, Waste of Time WiFi. Extra Wheel in the boot. (And a towbar)


BOBCDP
Posts: 318
Joined: Wed Jun 22, 2016 8:51 pm
Location: Vale of Glamorgan

Re: pitted and corroded brake discs

Post by BOBCDP » Thu Jul 05, 2018 4:07 pm

BRC wrote:
Thu Jul 05, 2018 9:02 am
Apologies for resurrecting a somewhat dated thread but years ago brake discs could and were "faced" i.e. machined back to flat. Obviously this had to be within the limits of the brake disc. Is this still practised by garages or are they always replaced as a matter of course?
Have to say there is a wonderful automotive machine shop my son has used in times past and I'd be amazed if they don't offer such a service.
I had a Porsche Boxster about 3 years ago and that failed the MOT on uneven braking. The outsides of all 4 discs were perfect but the inner sides were very badly corroded. The Porsche specialist offered to skim them but it worked out almost the same price as having new discs so in the end I replaced pads and discs all round. Only £1100.00 :o :o :o

So the answer is yes they can do it but it's probably not worth it.
MY16 2015 R-Sport 180d, Auto, Yulong White,


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Vespa
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Location: North West UK

Re: pitted and corroded brake discs

Post by Vespa » Thu Jul 05, 2018 4:18 pm

This is most likely due to poor servicing and the slide pins seizing causing the caliper to malfunction. Typical slapdash work.
180 diesel XE R Sport, with many extras :D


BOBCDP
Posts: 318
Joined: Wed Jun 22, 2016 8:51 pm
Location: Vale of Glamorgan

Re: pitted and corroded brake discs

Post by BOBCDP » Thu Jul 05, 2018 4:30 pm

Vespa wrote:
Thu Jul 05, 2018 4:18 pm
This is most likely due to poor servicing and the slide pins seizing causing the caliper to malfunction. Typical slapdash work.
I found out later that it was a very common problem due to a backplate allowing crap and moisture to ferment behind the discs so causing the corrosion.
MY16 2015 R-Sport 180d, Auto, Yulong White,


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BRC
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Joined: Mon Jun 25, 2018 8:01 pm
Location: Surrey

Re: pitted and corroded brake discs

Post by BRC » Thu Jul 05, 2018 6:35 pm

BOBCDP wrote:
Thu Jul 05, 2018 4:07 pm

I had a Porsche Boxster about 3 years ago and that failed the MOT on uneven braking. The outsides of all 4 discs were perfect but the inner sides were very badly corroded. The Porsche specialist offered to skim them but it worked out almost the same price as having new discs so in the end I replaced pads and discs all round. Only £1100.00 :o :o :o

So the answer is yes they can do it but it's probably not worth it.
£1100, that's about 5 times what I would have expected! Way more years ago than I care to remember part of my "training" was to learn and effectively use machine tools. In those days I think me or any of my 5 other co-conspirators would have popped them on a lathe and had them flat/perfect in say 20 minutes each disc. Times they have changed but I still know one lad who applies himself to physically machining (where possible) whatever he can make himself. As for me I prefer to buy what I need but it doesn’t stop we waxing lyrically about time past. :)


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