colsoop Posted April 14, 2008 Share Posted April 14, 2008 After the fun of Marham i now have blue heatspots in a fairly uniform pattern around the rear disks, I assume this is down to heat, the fronts are fine. I was thinking of making up some ducting to cool the brakes, if i sealed the rear pods off and utilised some ducting would i actually get any cooling to the rear brakes or would i have to make something up to cover the rear face of the disk? Somebody posted up a link to some quite well made carbon ducts that looked like they would work well. Any thoughts or ideas appreciated Link to comment Share on other sites More sharing options...
colsoop Posted April 15, 2008 Author Share Posted April 15, 2008 I found the ducts although they are for a BMW: http://www.turnermotorsport.com/image/brakes/brakes_e36m3_carbon_backingplates_lg.jpg I thought if i got some dust shields i could make a mold of them and create something similar ? Link to comment Share on other sites More sharing options...
Wez Posted April 15, 2008 Share Posted April 15, 2008 Arent you using race pads which leave a blue colour on the disk? Link to comment Share on other sites More sharing options...
colsoop Posted April 15, 2008 Author Share Posted April 15, 2008 I have blue spots on the rear disks. They were not very happy with the heavy braking and although they did stop me they didn't inspire confidence. Im just spitballing ideas for extra cooling . Link to comment Share on other sites More sharing options...
Wez Posted April 15, 2008 Share Posted April 15, 2008 I was having the same issue on the main straight, the judder from the brakes was not good. I think the issue might be the stock disks. Link to comment Share on other sites More sharing options...
colsoop Posted April 15, 2008 Author Share Posted April 15, 2008 I was having the same issue on the main straight, the judder from the brakes was not good. I think the issue might be the stock disks. I think you are right Wes, but i can't justify the cost at the moment of bigger or better designed brakes so was trying to reduce the heat build up if possible. Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 15, 2008 Share Posted April 15, 2008 The back brakes don't do a huge amount of work on front engined cars, the spotting may just be nothing to worry about. What pads? What discs? Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 15, 2008 Share Posted April 15, 2008 I was having the same issue on the main straight, the judder from the brakes was not good. I think the issue might be the stock disks. Could well be, expecting news end of this week Link to comment Share on other sites More sharing options...
Sharpie Posted April 15, 2008 Share Posted April 15, 2008 Link to comment Share on other sites More sharing options...
Wez Posted April 16, 2008 Share Posted April 16, 2008 Could well be, expecting news end of this week Link to comment Share on other sites More sharing options...
colsoop Posted April 16, 2008 Author Share Posted April 16, 2008 The back brakes don't do a huge amount of work on front engined cars, the spotting may just be nothing to worry about. What pads? What discs? Stock uk spec discs and porterfield pads. Link to comment Share on other sites More sharing options...
colsoop Posted April 16, 2008 Author Share Posted April 16, 2008 Added a couple of pics: (large size) http://img258.imageshack.us/img258/2112/brakescy9.th.jpg http://img440.imageshack.us/img440/9976/brakes2vj8.th.jpg Link to comment Share on other sites More sharing options...
Chris Wilson Posted April 16, 2008 Share Posted April 16, 2008 It's the discs. Also, Porterfield pads have a large sintered iron content and put a lot of heat into any locally raised spots on the disc, they don't "squash" at all. So if the discs deform the raised areas suffer huge heat inputs, which is what you are seeing. Once you take a big heavy brute like the supra onto tracks where there is a sudden stop from very high to very low speeds consider the discs like petrol. here today, gone tomorrow. Proper race discs will last better, but are still considered consumables. I think my R33 GTR got through 8 sets of AP racing 333 mm front discs in the 18 months I had it. Bizarre as it may sound, if you took it to say Donington the discs would last longer, as the thermal shocks would be less as the discs don't have such sudden temp changes. Link to comment Share on other sites More sharing options...
Robbie Posted April 16, 2008 Share Posted April 16, 2008 For what it's worth, I had the blue spots all over my TDI front grooved disks after 1 trackday. I replaced them with dba disks and road race pads. At the same time I had all the brakes overhauled with the service kits. Since then no problems at all. I'm now sure that the first setup had a very small amount of rubbing from the pads to the disks generating a lot of friction heat. By servicing the calipers there would be better movement on the pads when releasing brake pressure meaning no disk/pad contact. Link to comment Share on other sites More sharing options...
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