Mike B Posted March 12, 2007 Share Posted March 12, 2007 I'm experiencing a fairly squishy pedal feel, brakes are good, always work to a good extent, b ut the pedal feel is a lot squishier than the last 2 sups I have had. Pedal hardens and comperesses much further up the stroke one the brakes have been pumped and when hot (trackday) the pedal engages a lot further down the stroke than normal. this is very different to my last sup which had very positive feel, and never altered with use. I also feel that the brakes are slightly out of balance, car pulls right, ever so slightly under hard braking... I have completely changed the fluid today, bled all 4 corners right through, system is exactly the same. Would a new master cylinder help? how does the abs system interface with the brakes - could it be a fault in here? any wisdom welcomed. Quote Link to comment Share on other sites More sharing options...
Sheefa Posted March 12, 2007 Share Posted March 12, 2007 Mike, I'm certainly not experienced, but Chris Wilson and Ian or someone were discussing braking instances the other day prior to Donington. A squishy feeling and a greater force required to get the braking up to scratch apparently indicates boiling brake fluid. I'll try and find it. FOUND IT: half way down matey: http://www.mkivsupra.net/vbb/showthread.php?t=93122&highlight=brake+fluid Perhaps change the type of fluid you're using mate? Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted March 13, 2007 Share Posted March 13, 2007 Hi Mike, Get a Cusco Brake Master Cylinder Stopper fitted to the car, flush the fluid with Motul 5.1 Think Terry had braided lines fitted already, if not get them done too. Gaz. Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted March 13, 2007 Share Posted March 13, 2007 Gaz, can you explain what that does/benefits etc please. I've heard it mentioned before but what does it actually do. Quote Link to comment Share on other sites More sharing options...
Stevie Boy Posted March 13, 2007 Share Posted March 13, 2007 Think the stoppers are meant to help reduce/eliminate the movement of the brake servo+master cylinder experienced from the flexing if the bulkhead to which it is all mounted to. So rather than as you press brake pedal a certain degree of additional travel happens cos your flexing the bulkhead the stopper prevents the master cylinder moving so effort is all transferred to braking and not moving the servo+master cylinder assembly............. sorry if that makes no sense what so ever! Quote Link to comment Share on other sites More sharing options...
Nic Posted March 13, 2007 Share Posted March 13, 2007 Get a Cusco Brake Master Cylinder Stopper fitted to the car, flush the fluid with Motul 5.1 I have one of these fitted, they give a noticeable improvement in pedal firmness. Another alternative is the Carbing tower bar, which has a buit in brace for the brake master cylinder. http://f10.putfile.com/7/18616374710.jpg Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted March 13, 2007 Share Posted March 13, 2007 Hi Mike, Get a Cusco Brake Master Cylinder Stopper fitted to the car, flush the fluid with Motul 5.1 Think Terry had braided lines fitted already, if not get them done too. Gaz. Gaz the car has a Carbing brace with built in Stopper. Mike that is all a bit weird, It has Project Mu teflon hoses on it, check those, if not, a master cylinder my help. Did you put 4.1 in the car? Quote Link to comment Share on other sites More sharing options...
Nic Posted March 13, 2007 Share Posted March 13, 2007 Gaz the car has a Carbing brace with built in Stopper. I'd forgotten it was your old motor Terry Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted March 13, 2007 Share Posted March 13, 2007 I'd forgotten it was your old motor Terry And a lovely brace it was too thanks Nic:d Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 13, 2007 Share Posted March 13, 2007 Get someone to press the brakes on and off HARD with engine idling, with car on a ramp. Look to see if the calipers are moving AT ALL on their mounts, or the discs are flexing, if so it could very well be a partly seized caliper. If it had stock rubber lines I'd suggest you squeeze each caliper line off, in turn, with hose clamps, and see if the pedal suddenly gets a lot better. if it did that would ID the offending caliper(s). Braided hose CAN be squashed, but it's not good for it, nor recommended. Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted March 13, 2007 Share Posted March 13, 2007 sorry if that makes no sense what so ever! No it did, and Nics picture just backed it up Sounded a bit fancy to start but then when I saw what it was.. Quote Link to comment Share on other sites More sharing options...
Ark Posted March 13, 2007 Share Posted March 13, 2007 Get a Cusco Brake Master Cylinder Stopper fitted to the car, flush the fluid with Motul 5.1 Are they compatible with the TRD strut brace? Quote Link to comment Share on other sites More sharing options...
Nic Posted March 13, 2007 Share Posted March 13, 2007 Are they compatible with the TRD strut brace? Not sure, but here's a pic of mine fitted with an ARC tower bar. It was quite easy to get it to fit. http://img145.imageshack.us/img145/1140/p1020539cn0.jpg http://img247.imageshack.us/img247/9925/p1020540bk2.jpg Quote Link to comment Share on other sites More sharing options...
Chiefgroover Posted March 13, 2007 Share Posted March 13, 2007 I had this problem with silicone fliud. I then took the time to look up the owners manual and realised that toyota states "do not use silicone fluid in toyota abs systems" Changed to 5.1, pedal was brill after that. Quote Link to comment Share on other sites More sharing options...
Gaz Walker Posted March 13, 2007 Share Posted March 13, 2007 Gaz the car has a Carbing brace with built in Stopper I see - I had a look on your old site and it had the TRD one there so I didn't think it had been done, otherwise I would have recommended the Carbing Great pics though Nic. Gaz. Quote Link to comment Share on other sites More sharing options...
Mike B Posted March 13, 2007 Author Share Posted March 13, 2007 Hi Terry, yes matey - complete fluid change to 4.1, no difference - there is definately something awry somewhere... maybe she is missing your firm hand! All disks are clean and getting pressure... I guess I may follow chris's disgnostics and then may try a new master, as I don't think that they are that expensive. Front brakes are new and came off my last car where they were really good, on here they feel totally different! The reason I asked about the ABS system is that maybe something is wrong in there and this is soaking up the pressure/feel...? stuck caliper would explain the slight yaw under hard braking, but not the pedal feel... right? Quote Link to comment Share on other sites More sharing options...
Chiefgroover Posted March 13, 2007 Share Posted March 13, 2007 Isnt there a section in the workshop manual on bleeding the ABS system? rather than just at the calipers? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 13, 2007 Share Posted March 13, 2007 Yes. Quote Link to comment Share on other sites More sharing options...
Mike B Posted March 13, 2007 Author Share Posted March 13, 2007 right - gonna try that next! Quote Link to comment Share on other sites More sharing options...
Ryan.G Posted March 13, 2007 Share Posted March 13, 2007 I have just looked into this but cant find anything on bleeding abs If anyone finds it please post how Quote Link to comment Share on other sites More sharing options...
Chiefgroover Posted March 13, 2007 Share Posted March 13, 2007 Go look for a nipple lol, not pink ! Quote Link to comment Share on other sites More sharing options...
Kranz Posted March 13, 2007 Share Posted March 13, 2007 Are they compatible with the TRD strut brace? Yep, Cusco stopper & TRD brace go together nicely. I have them both. Quote Link to comment Share on other sites More sharing options...
Ryan.G Posted March 14, 2007 Share Posted March 14, 2007 Ok looked round the whole car last night and only bleed nipple i found apart from on uk brakes was one of clutch cylinder How do you bleed the abs unit and master cylinder??? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 14, 2007 Share Posted March 14, 2007 Bleed it with engine idling. Quote Link to comment Share on other sites More sharing options...
Ryan.G Posted March 14, 2007 Share Posted March 14, 2007 Arhh Hail Chris Quote Link to comment Share on other sites More sharing options...
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