Guest Jamesgregory Posted June 25, 2013 Share Posted June 25, 2013 (edited) Hello Fellow Supra Stars! Another query to test your Supra brain powers please. I am having a problem with my front right caliper Jamming the brake on very very hard. I thought the caliper had seized and after an oily couple of hours got the new one fitted only to find I am having the same problem. so this has pointed me towards the Master cylinder now. Does anyone know if this is a common fault? Should I replace the whole master cylinder or try a repair kit? Any thoughts would be much appreciated Thanks guys Fingers crossed one of the craziest looking aerotops will be finished in the next few weeks. Edited June 25, 2013 by James Advertising removed. (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Bailey Posted June 25, 2013 Share Posted June 25, 2013 Dont cut corners with brakes because they save your life. If you think the master cylinder is at fault just replace the whole unit Dont bother repairing it because it may be at fault again sometime down the line. Quote Link to comment Share on other sites More sharing options...
Coleboy Posted June 25, 2013 Share Posted June 25, 2013 Make sure the hose to the caliper has not collapsed inside, its a common fault on older cars, holds a small amount of pressure on the caliper and runs the pads on slighty........ Quote Link to comment Share on other sites More sharing options...
safcdixon Posted June 25, 2013 Share Posted June 25, 2013 Mmmm Jam!! Quote Link to comment Share on other sites More sharing options...
clay Posted June 25, 2013 Share Posted June 25, 2013 Id try the brake pipe first mate. And make shore the sliders are all ok. How clean is the brake fluid.? When the pipe starts to age it can go very dark or black. The rubber pipe can look fine outside but be perished inside. Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted June 25, 2013 Share Posted June 25, 2013 It's usually a sticky piston in the caliper - did you fit a 2nd hand replacement? If so it's possible that you've been unlucky and got another sticky one - worth refurbing all the calipers and fitting steel braided lines imo. If it's a new caliper the try the master cylinder Quote Link to comment Share on other sites More sharing options...
Guigsy Posted June 25, 2013 Share Posted June 25, 2013 [video=youtube;-MnELifX3sQ] never realised fatboy slim played bass on that. Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 25, 2013 Share Posted June 25, 2013 The master cylinder wont cause 1 caliper to sieze on, it has to be the caliper Quote Link to comment Share on other sites More sharing options...
Abz Posted June 25, 2013 Share Posted June 25, 2013 The master cylinder wont cause 1 caliper to sieze on, it has to be the caliper This I would have thought!! Quote Link to comment Share on other sites More sharing options...
thetrashcanman Posted June 25, 2013 Share Posted June 25, 2013 It's usually a sticky piston in the caliper - did you fit a 2nd hand replacement? If so it's possible that you've been unlucky and got another sticky one - worth refurbing all the calipers and fitting steel braided lines imo. If it's a new caliper the try the master cylinder hmmm jamm and a sticky piston? Does this make this a sticky situation Quote Link to comment Share on other sites More sharing options...
stevie_b Posted June 26, 2013 Share Posted June 26, 2013 As said, either the replacement has sticky pistons as well as your original, and/or the slider pins are not sliding well. Quote Link to comment Share on other sites More sharing options...
Digsy Posted June 26, 2013 Share Posted June 26, 2013 Interesting that it jammed again after fitting a new caliper. As above, it doesn't sound like the master cylinder to me. Was the caliper new or second hand? Sticky calipers are incredibly common on these cars. I've probably replaced all four corners on mine at least twice. Have you checked to see if the disc is badly warped and catching in a certain spot, or is it dragging all the way around? Quote Link to comment Share on other sites More sharing options...
Guest Budz86 Posted June 26, 2013 Share Posted June 26, 2013 The master cylinder wont cause 1 caliper to sieze on, it has to be the caliper Yeah, good point. Just thinking if all the brakes are/get refurbed it doesn't leave many options. Unless the pressure is too much as it's the shortest brake line but thats unlikely, never heard of it happening before but thinking out loud. Forgot about the slider pins though - had this on my car a while back too! Quote Link to comment Share on other sites More sharing options...
Guest Jamesgregory Posted June 27, 2013 Share Posted June 27, 2013 Thanks for all the input guys, It was a second hand caliper but was good on the car it came offand we checked that the pistons were moving freely and pushed them totally back before fitting it. on further inspection the caliper that came off was fine afterall and had not seized. Ive seen a seized caliper before and you cant push the pistons back even with a hammer and rod. I am now thinking perhaps a perished brake line, presumably the part inside the wheel arch as the rest of it is metal and only a short run inside the car. and I don't think it's the sliders as this "new" caliper was all working fine when I had it off the car. Thanks again for the advices! Quote Link to comment Share on other sites More sharing options...
Guest Jamesgregory Posted June 27, 2013 Share Posted June 27, 2013 Hey Digsy, all new discs and pads so pretty sure it's not that. Ive ordered some new braided lines so will see if that cures it. and will bleed all the old fluid out and try some new stuff I think. New caliper is definitly fine, so it has to be the line or the master cylinder. Quote Link to comment Share on other sites More sharing options...
Guest Jamesgregory Posted July 8, 2013 Share Posted July 8, 2013 Just fitted the new hose and seems to certainly have improved the problem, but when the car is jacked up the disc is still being trapped by the pads slightly stopping it from moving freely. It's not seizing on tight like it was before but could still be better. Does this mean it must be the master cylinder now? As we have a new caliper, pads, discs and braided line? Quote Link to comment Share on other sites More sharing options...
markylee Posted January 31, 2014 Share Posted January 31, 2014 Can someone please answer the previous question, as I am having the same problem, is it possibly the master cylinder?, my calipers and sliders seem free, but a mechanic told me it could be my master cylinder, the problem only occurs on the near side front, one person on this thread has already saidsaid its not possible for the problem to be the MS , but would like to know why, Thanks. Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 31, 2014 Share Posted January 31, 2014 Because the master cylinder has one output that goes to all four brake calipers. If it somehow retained brake pressure, all four would lock on, not just one. (actually it has two but you know what I mean) Have you checked/replaced the guide pins the caliper slides on? Can you manually slide it forwards and backwards with relatively little resistance? It's probably not going to be the piston, but these bits instead. Also, if you've still got the old brake pads, check the wear on them - I'd wager the inner pad is a lot lower than the outer one. Quote Link to comment Share on other sites More sharing options...
markylee Posted February 1, 2014 Share Posted February 1, 2014 Thanks for that Ian, good news that its not the MC , I have a set of lexus 400 caliipers which I think I will put on, the only reason I I have not done this before is because I will have to put my 17" oem wheels back on which I am not a fan of , but might look ok if painted black,,,,,,, thanks again for the reply,,,,,,,,,,,,,,Mark Quote Link to comment Share on other sites More sharing options...
2soops Posted February 1, 2014 Share Posted February 1, 2014 Have you made sure the whole caliper moves easy on the sliders when fitted to the car. These are totally separate to the pistons inside the caliper. I can't tell from your post if this is what you meant, but if you have checked them properly please ignore me Quote Link to comment Share on other sites More sharing options...
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