Dave Carroll Posted September 13, 2015 Share Posted September 13, 2015 As the title says really.... Decided to flush out the brake fluid and replace with some new stuff today (my all out comp spec brakes are waiting for next year) to get rid of what seemed like fluid boil at the last track day. Afterall, the j specs with the pads and discs im using were fine and the front tyres were the limiting factor for now... Well the fluid change wouldnt bleed properly... I found the front left caliper had a huge fracture around the bleed nipple! And i mean it is hanging on by around a quarter of its circumference. Good job i brought those uk specs back from Japan! Link to comment Share on other sites More sharing options...
Dr_Doom Posted September 13, 2015 Share Posted September 13, 2015 It's very common on the j-spec brakes. You only need to over-tighten the bleed nipple a tiny amount and they crack. Link to comment Share on other sites More sharing options...
Dave Carroll Posted September 13, 2015 Author Share Posted September 13, 2015 That is a major design flaw on a safety critical part if you ask me. If there is one thing toyota got wrong in the 90s its these j spec calipers. They seize so easily, ive seen them fracture around the pads on the rears and now this.... Any common failures i should watch out for on the uk specs? Link to comment Share on other sites More sharing options...
Havard Posted September 13, 2015 Share Posted September 13, 2015 Not uncommon at all. Too many over tighten them. Link to comment Share on other sites More sharing options...
j_jza80 Posted September 13, 2015 Share Posted September 13, 2015 Any common failures i should watch out for on the uk specs? When they get old, the pad sliding pins in the calipers often become stuck. If they flare or bend, it means drilling the caliper out. Next time you change your pads, fir some Chris Wilson stainless caliper pins Link to comment Share on other sites More sharing options...
bignum Posted September 13, 2015 Share Posted September 13, 2015 If you overtighten the banjo bolt they can crack. Link to comment Share on other sites More sharing options...
evinX Posted September 13, 2015 Share Posted September 13, 2015 Cast aluminium, Heard of it for years until one day it happened to mine. Luckily I had another scrapper parked on the drive which I just salvaged off. Link to comment Share on other sites More sharing options...
Dave Carroll Posted September 17, 2015 Author Share Posted September 17, 2015 When they get old, the pad sliding pins in the calipers often become stuck. If they flare or bend, it means drilling the caliper out. Next time you change your pads, fir some Chris Wilson stainless caliper pins Luckily my UK specs are in very good condition for now... came off a low mileage car in japan, but admittedly supposed to have been used fairly hard. Chris has told me about his stainless steel rebuild kits for the UK specs so will be ordering them when the time comes Link to comment Share on other sites More sharing options...
Paul372 Posted September 17, 2015 Share Posted September 17, 2015 Yes, when I first brought my supra, every new car I buy I always do a service and change the brakes, so when I brought the supra I got on to change the front discs and pads and found both front calipers had cracked and leaking fluid near the bleed nipples where they have been over tighten, I'm lucky that I always do that on every new car I buy other wise I could of had a nasty accident Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 17, 2015 Share Posted September 17, 2015 Cast aluminium, Heard of it for years until one day it happened to mine. Luckily I had another scrapper parked on the drive which I just salvaged off. They are grey cast iron actually. And there's no design flaw, just flaws in home mechanics Link to comment Share on other sites More sharing options...
j_jza80 Posted September 17, 2015 Share Posted September 17, 2015 Luckily my UK specs are in very good condition for now... came off a low mileage car in japan, but admittedly supposed to have been used fairly hard. Chris has told me about his stainless steel rebuild kits for the UK specs so will be ordering them when the time comes Just make sure you keep any eye on those pins, as by the time you realise it's a problem it will be too late. Better to replace them sooner than later Link to comment Share on other sites More sharing options...
Jellybean Posted September 17, 2015 Share Posted September 17, 2015 they are grey cast iron actually. And there's no design flaw, just flaws in home mechanics Link to comment Share on other sites More sharing options...
a98pmalcolm Posted September 17, 2015 Share Posted September 17, 2015 yep.. the bleed niple has been over tightened Ive done it before lol Link to comment Share on other sites More sharing options...
SupraP-Z Posted September 18, 2015 Share Posted September 18, 2015 Happened to mine too, luckily it wasnt me who did it haha. Eeded up replacing with UK specs all round myself...much better Link to comment Share on other sites More sharing options...
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