cast iron 130 Posted June 15, 2019 Share Posted June 15, 2019 Properly boiling my front brakes this weekend at Knockhill Are vented discs on the front a standard disc form a road car? If so which model please? Quote Link to post Share on other sites
CraigHew 1,896 Posted June 15, 2019 Share Posted June 15, 2019 My S2000 uses ventend and groved discs from an Escort Mk 2 Vented Disc (Std Grooved) 283mm. HiSpec produce them but as a company they're b*stards to deal with... You'd need to check which discs will fit your calipers too, unless you're going to uprate them at the same time. Quote Link to post Share on other sites
the stoat 316 Posted June 16, 2019 Share Posted June 16, 2019 I would place a significant bet that this can be solved without changing the discs. First thing would be fluid, when did you last change it? I like Gulf RF1000 and have never been able to boil it. If you then still have issues look at the pads. What pads are you currently running and what calipers? 3 Quote Link to post Share on other sites
cast iron 130 Posted June 17, 2019 Author Share Posted June 17, 2019 yes fluid is changed every 6 months. Knockhill is a short circuit with at least one massive step on the pedal every minute from 120 down to a second gear hairpin. Carbotech pads Castrol react dot4 fluid Im not getting brake fade, the pedal pressure drops right off. 30 mins after the race back to normal Quote Link to post Share on other sites
AdamR 2,423 Posted June 17, 2019 Share Posted June 17, 2019 Even with bog standard Dot4 it shouldn't be boiling the fluid. Definitely not air in the system? Echo comments about not needing vented discs. Quote Link to post Share on other sites
SootySport 1,055 Posted June 18, 2019 Share Posted June 18, 2019 What callipers do you have? Never known a Westfield to overheat brakes as you say. Quote Link to post Share on other sites
Dave Eastwood (Gadgetman) - Club Secretary 7,793 Posted June 18, 2019 Share Posted June 18, 2019 37 minutes ago, SootySport said: What callipers do you have? Never known a Westfield to overheat brakes as you say. From what I remember it wasn’t that uncommon for some back in the days of the Westfield race series. Quote Link to post Share on other sites
cast iron 130 Posted June 19, 2019 Author Share Posted June 19, 2019 It runs Hispec 4 pots M16 replacements on the front Quote Link to post Share on other sites
DE04* 247 Posted June 20, 2019 Share Posted June 20, 2019 Does it happen at other tracks or just Knockhill? Quote Link to post Share on other sites
cast iron 130 Posted June 20, 2019 Author Share Posted June 20, 2019 started this year at Croft , driving a hell of a lot faster! I think ive found the limit, but still need to go faster! Quote Link to post Share on other sites
Chris King 5,033 Posted June 20, 2019 Share Posted June 20, 2019 On 18/06/2019 at 23:22, SootySport said: What callipers do you have? Never known a Westfield to overheat brakes as you say. On road no - but a local S2000 powered car would boil the brakes at Croft Quote Link to post Share on other sites
Chris King 5,033 Posted June 20, 2019 Share Posted June 20, 2019 @cast iron maybe @phil.mercboy can tell you how he solved his boiling brakes issue? Quote Link to post Share on other sites
AdamR 2,423 Posted June 20, 2019 Share Posted June 20, 2019 15 hours ago, cast iron said: It runs Hispec 4 pots There is your problem. The pistons are too high up the caliper, this makes the pads wear at a taper. When hot the pistons bind up and leave you with spongy brakes, when cool everything feels 'normal' again. I use quotation marks because brakes are always horribly spongy with those calipers, get someone else to press your brake pedal and check the flex! Something else that may help improve your braking in general is doing some proper brake bias calculations at www.brakepower.com. Quote Link to post Share on other sites
SootySport 1,055 Posted June 20, 2019 Share Posted June 20, 2019 Exactly as above, hi spec ultralight will flex and wear unevenly, been there and done that. Solution was to return to the trusty Ford M16’s. Quote Link to post Share on other sites
cast iron 130 Posted June 20, 2019 Author Share Posted June 20, 2019 Pads are flat level, no taper Quote Link to post Share on other sites
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