 | Home > Maintenance & Modifications > Polished Brake Discs |
 
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329   
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So in the process of buying new rear calipers but should I be getting new discs?
with the depth of wear of normally wouldn't give it a moments thoughs as the discs appear to be fine in terms of little wear depth wise and no grooves. my concern is hope mirror like they are / smooth like glass and therefore I presume little friction? can / should I just go round them with some wet n dry?  Click image to enlarge |
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18th Apr 2016 9:41am |
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| Mo Murphy Member Since: 01 Jun 2008 Location: Letchworth Garden City, Herts Posts: 2326  
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Mirror finish is a good sign.
Mo The Land Rover 90 - Many are called, few are chosen. 50 Shades of Pennine Grey |
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18th Apr 2016 10:48am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329
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not sure if we're talking about the same thing here. I've yet to own a car that has discs with a mirror finish. they've all had what appears to be a very slightly grooved / brushed finish.
I'm not looking to improve the braking over and above standard but I've thinking (and I'm not sure) that with this polished finish (other 3 are what I'd class as normal) is breaking less effectively and occasionally giving a strange noise when slowly down? |
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18th Apr 2016 11:27am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329
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Its amazing how easily some are 100% satisfied......
http://www.ebay.com/itm/like/131777791920?...rmvSB=true at that price for them I wouldn't be very pleased !  |
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18th Apr 2016 11:55am |
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| RED-DOT Member Since: 29 Jun 2009 Location: stirling Posts: 2363 
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Shiny discs dont hold dirt which can impregnate the pad surface so i would say you have good discs. 2008 RS4 gone, 123d M Sport, and a Puma 90 XS..
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18th Apr 2016 12:08pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329
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thanks Red-dot. I certainly can't argue with your logic but do have to wonder why they are so shiny. never had it before and having been out and about lunch time walking and checking out everyone's dics.....none appea to be like mine? They all seem to have the matt finish.
anyway I'll not worry too much as I need to sort the calipers first but was thinking if the discs need to go then clearly it would be best to do so while changing the calipers rather than at a late date.  |
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18th Apr 2016 2:19pm |
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| jimbob7 Member Since: 06 Jul 2013 Location: uk Posts: 2055 |
The cheapest but by far best brake material discs are made from CAST IRON.NOBODY makes brake disc from stainless steel,EVER.I you got a mirror finish then you have been ripped off good style,by radiated cheap crap steel.
Cast iron rusts,period.If you don't want discs to rust then buy ceramic or carbon fibre discs for THOUSANDS AND THOUSANDS of pounds,it's that simple. Cast iron discs rust,period!! Pov.spec,ftw. 2006, 110,TD5. |
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18th Apr 2016 3:13pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329
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they're the originals. I don't doubt what you've said but they're the original discs yet as per the photo this one has a 'wonderful mirror' finish to it? I know not why? |
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18th Apr 2016 3:16pm |
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| RustyM Member Since: 28 Oct 2013 Location: Africa/The Med Posts: 222 
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I have seen this when a brake caliper has stuck on and heated up the disc, it can cause the disc to warp and then vibrate under braking. If it was me I would change the discs at the same time as the caliper’s. You would then be happy you did
Good luck and I have my finger X'd it keeps going well for you  90 & Wolf
110 XS Previously owned SI SII SIIa SIII & Light weight (air portable) |
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18th Apr 2016 3:22pm |
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| K9F Member Since: 12 Nov 2009 Location: Bournemouth Posts: 9610 
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I seriously doubt it!  
Pee on your disks and leave them overnight they'll look as scabby as everyone else's in the morning and we can then move on, but after we have please don't re-inspect your discs or just don't use the brakes. If you go through life with your head in the sand....all people will see is an ar5e!! Treat every day as if it is your last....one day you will be right!! |
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18th Apr 2016 4:12pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329
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I don't think the disc(s) are warped. I have on occasion sensed what I could have mistaken for a warped disc when braking but this hasn't been regular it's clearly not warped. Mal - it's only taken 5+ years but tis driving well and at present there's nothing I have concerns over (bar the rear calipers)
The only thing after that I can think of is corrosion and up grades.
Ps. Don't do it..... Keep the 90. |
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18th Apr 2016 8:10pm |
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| mick Member Since: 08 Feb 2010 Location: Yorkshire Posts: 2109 
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Take em off and send em to me mine have 100 K + on the originals discs bout ready for some more
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18th Apr 2016 8:58pm |
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| tuesdayfox Member Since: 23 Jun 2013 Location: Sydney,OZ Posts: 129 
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I recently changed the rear brake pads and rotors.
I was told both the brake pads and disc should be changed at the same time because there may be uneven warp/groove on rotors that prevent proper bedding of brake pads. also, brake pads cost just almost as much as brake rotors... so it wouldn't be cost effective to just replace brake pads if you just want to save a few bucks on rotos and keep ruining new brake pads. my 2cents. cheers Martin |
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19th Apr 2016 7:43am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6329
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I'd fully agree on changing the rotors if they were in poor shape i.e loads of grooves etc.
I've replaced just pads on numerous occasions and haven't had an issue. I would always replace an axle at a time and not just one corner of course but I see no reason to replace the rotors un-necessarily and from what I've seen the rotors are about 5 - 6 times the cost of the pads? thanks all the same. back to the original question - should I just attack the rotors with some wet n dry. I put new pads in the weekend so I'll have a look to see if the polished finish is subsiding and then take a view on it. |
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19th Apr 2016 7:49am |
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