ryanfels Posted September 7, 2010 Share Posted September 7, 2010 Ok, so i got a cert but Clint said my brake test only just failed because my back brakes were locking up to easy under hard braking. He said i just need to get an ajustable proportioning valve and ajust the bias. Does this sound right and is there any other way to stop the back brakes locking up without forking out $100 on this valve? Ryan Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 7, 2010 Share Posted September 7, 2010 Not really, what have you done to your brakes conversion wise? I haven't followed. Last thing you want is the rears locking before the fronts, will send you on a spin into something one day when you have to brake hard Quote Link to comment Share on other sites More sharing options...
KKtrips Posted September 7, 2010 Share Posted September 7, 2010 Brake line clamp? Easy answer is no - if you have fitted different brakes from a bevy of different models then it could have a brake imbalance.. The wrong master/piston area ratio. However if you have transferred the complete front and brakes from one model to yours then you could fix it with a master cylinder change - but that would be more than $100... Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 7, 2010 Author Share Posted September 7, 2010 Nah ive only replaced the master and the rubber lines, i havnt done any upgrading. I have got slightly better pads in back then the front though Quote Link to comment Share on other sites More sharing options...
fuel Posted September 7, 2010 Share Posted September 7, 2010 $100 on an adjustable proportioning brake bias valve is probably the cheapest way to fix it. It's probably the heavier 2JZ-GTE up front makes it harder for the front brakes to do their job as effectively as they would have with the 1G-EU before hand, while nothing has changed with the rears therefore they lock up before the fronts even think of locking up. I'm unsure what pads you are running up front but perhaps with some super high quality pads and get them nice and warm before doing the check, the fronts may just lock up the same time as the rears. However that would just be applying a band-aid over the problem, which is that with the change of weight distribution front and rear with the 2JZ, you'll need to change the brake bias. Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 7, 2010 Author Share Posted September 7, 2010 ok, so sounds like the proportioning valve is the way to go Quote Link to comment Share on other sites More sharing options...
fuel Posted September 7, 2010 Share Posted September 7, 2010 haha and yeah having lush pads in the rear and crap pads in the front would do that too, I would have thought that would have been obvious Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 7, 2010 Author Share Posted September 7, 2010 lol theyre not crap in the front, just not as lush as the back Quote Link to comment Share on other sites More sharing options...
KKtrips Posted September 7, 2010 Share Posted September 7, 2010 I have got slightly better pads in back then the front though Yeah this bit of information could have been important to start with. Get new pads for the front, preferably matching brand but at the very least a matching or better compound than the rear.. Why you would have good pads in the rear and less good pads in the front is a WTF moment? Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 7, 2010 Author Share Posted September 7, 2010 I have got slightly better pads in back then the front though Why you would have good pads in the rear and less good pads in the front is a WTF moment? Yea sorry, i did forget to mention that. I replaced the fronts about a year after i got the car with Bendix Race pads and then a few months later when the backs needed doing, there was no stock of the same pads so i had to go custom. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 7, 2010 Share Posted September 7, 2010 Yea man get some better pads in the front, then see if you need the proportioning valve. The extra weight thing is difficult Phill, more weight in the front means more front end grip which should assist the front brakes, but then also less weight in the rear with weight shift means more prone to locking up. More weight on the front doesn't mean its going to be 'harder' for the front brakes Quote Link to comment Share on other sites More sharing options...
KKtrips Posted September 7, 2010 Share Posted September 7, 2010 Do this Keep - Bendix Race Pads - Front Buy - Bendix Metal-King Pads - Rear ^^ Install for Cert ^^ Buy - Custom Pads - Front Keep - Custom Pads - Rear ^^ Install at the track for Race-days ^^ Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 7, 2010 Author Share Posted September 7, 2010 Buy now has already been hit on a proportioning valve so ill just install that to keep Clint happy then look at some better front pads after that Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 8, 2010 Author Share Posted September 8, 2010 So i take it i need to install this valve in the rear brake line? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted September 8, 2010 Share Posted September 8, 2010 yup - you can install it somewhere under the car and out of the way - you will need to just set it once and then forget it.. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 8, 2010 Share Posted September 8, 2010 / in the cab so you can dial down the rear brakes for B-outs Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 8, 2010 Author Share Posted September 8, 2010 / in the cab so you can dial down the rear brakes for B-outs ahhh not a bad idea. Quote Link to comment Share on other sites More sharing options...
Hemi Posted September 8, 2010 Share Posted September 8, 2010 not legal . cant have adjustment in the cabin im pretty sure Quote Link to comment Share on other sites More sharing options...
ryanfels Posted September 8, 2010 Author Share Posted September 8, 2010 lol i thought so. So i just had a look in the engine bay and from the master, the hard line for the back brakes comes out and goes straight into a AISAN thing and straight out again. What is that and can i just replace it with my willwood valve? Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 8, 2010 Share Posted September 8, 2010 Yea its illegal haha, most race cars have them in the cab for obvious reasons There should be a factory rear bias valve sounds like what your describing, can probably replace it. I'd have to eye ball it first haha Quote Link to comment Share on other sites More sharing options...
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