Glanza_Mike Posted May 25, 2015 Share Posted May 25, 2015 Hi guys, i've recently installed brembo 4 pot rear and 6 pot fronts on my 98' tiptronic supra, i used to have the 2 pot rear and 4 pot front setup. I also have braided lines all round, running ate super blue fluid and a brake master cylinder stopper. So my question is: i presumed doing this upgrade would make a huge difference to pedal feel and braking power, and while it has made a difference its no where near as much as i thought it would be. The pedal still feels a bit meh, a little spongey, ive bled the brakes twice. My dad has APs on his Skyline, same sizes all round and that stops waaayyyyy better and has instant bite on the pedal. Could this be a master cylinder problem? Are there master cylinder upgrades for our cars? Or is it more than likely something else? Quote Link to comment Share on other sites More sharing options...
themodifiedkid Posted May 25, 2015 Share Posted May 25, 2015 I only upgraded to uk spec brakes and at first was disappointed with how they performed. In the end I must have bled them 5 or 6 times which made a massive difference. So could be something as simple as needing another bleed?! Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted May 26, 2015 Share Posted May 26, 2015 Do you know if the setup has better braking torque and similar brake bias to stock? DanDan did a brilliant thread on various brake upgrades, which showed that some of the aftermarket caliper setups were inferior to stock UK brakes. Quote Link to comment Share on other sites More sharing options...
Glanza_Mike Posted May 26, 2015 Author Share Posted May 26, 2015 Yeah ill try another bleed mate this weekend to see if it coukd be that thanks. Yeah Nason i read dandans thread but to be honest it doesnt really make sense to me how these brakes couldnt be considerably better than the Uk spec setup i had, i was on stock discs and stock pads with like 320mm discs and 4 pistons and now im using brand new caliprs with 6 pistons, brand new fast road poads and 360mm discs. These brakes wont be in dandans thread also so j cant check that mate. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted May 26, 2015 Share Posted May 26, 2015 But just because they are 6 piston doesn't mean that the overall surface area of the pistons is more than that of the UK brakes. Front to rear brake bias can have a huge effect on braking and stopping distances too. But as per your original question, I've seen plenty of Supras using the massive Brembo and Alcon racing spec brake kits in Japan, with the massive monobloc calipers they use and they're still using the stock master cylinder. Quote Link to comment Share on other sites More sharing options...
Scooter Posted May 26, 2015 Share Posted May 26, 2015 Those master cylinder braces are meant to firm things up are they not? Quote Link to comment Share on other sites More sharing options...
TuneR Posted May 26, 2015 Share Posted May 26, 2015 Before you bleed them again, activate the ABS a few times (i.e. lock up in a safe area/manner) and then bleed. I've had issues before with changing calipers and holding air in the ABS system, the activation should move the air into the lines and you should be able to bleed it out after. Quote Link to comment Share on other sites More sharing options...
Glanza_Mike Posted May 26, 2015 Author Share Posted May 26, 2015 But just because they are 6 piston doesn't mean that the overall surface area of the pistons is more than that of the UK brakes. Front to rear brake bias can have a huge effect on braking and stopping distances too. But as per your original question, I've seen plenty of Supras using the massive Brembo and Alcon racing spec brake kits in Japan, with the massive monobloc calipers they use and they're still using the stock master cylinder. Right okay, well the pistons on the front are 40mm each and obviously there are 6 of them at the rear they are 32 & 28mm. I'm not sure what the standard UK spec ones are but the pad size in the these on both front and rear is considerably larger. And thanks for the comment about the master cylinder, i presume it isn't that then. Those master cylinder braces are meant to firm things up are they not? That is correct Sir. Before you bleed them again, activate the ABS a few times (i.e. lock up in a safe area/manner) and then bleed. I've had issues before with changing calipers and holding air in the ABS system, the activation should move the air into the lines and you should be able to bleed it out after. Okay cool thank you mate, i'll give that a go then before i bleed the whole system again on Saturday morning. Quote Link to comment Share on other sites More sharing options...
Al Massey Posted May 26, 2015 Share Posted May 26, 2015 Just a quick one to consider. Which is something I'm doing later. The vacuum pipe for the brake servo that goes from the inlet manifold. What condition is that in? As mine is cracked and old and I'm pretty sure I'm leaking air from there as there is a difference in pedal feel if the revs are slightly higher. Quote Link to comment Share on other sites More sharing options...
inazone Posted May 27, 2015 Share Posted May 27, 2015 Make sure that brake stopper is screwed tight up to the master cylinder. Also make sure you are running decent pads as my 8 Pot D2 kit had crap pads. Now running Pagid SR19 competition pads, awesome braking! Quote Link to comment Share on other sites More sharing options...
Glanza_Mike Posted May 27, 2015 Author Share Posted May 27, 2015 Just a quick one to consider. Which is something I'm doing later. The vacuum pipe for the brake servo that goes from the inlet manifold. What condition is that in? As mine is cracked and old and I'm pretty sure I'm leaking air from there as there is a difference in pedal feel if the revs are slightly higher. Cheers Al, ill have a check of that mate, although the pedal feel seems to be consistent throughout the rev range. Make sure that brake stopper is screwed tight up to the master cylinder. Also make sure you are running decent pads as my 8 Pot D2 kit had crap pads. Now running Pagid SR19 competition pads, awesome braking! Yeah i've got decent pads so cant be that, brembo at the back and Hawk HPS at the front. Thanks for the suggestions. Quote Link to comment Share on other sites More sharing options...
supra_ufo Posted May 27, 2015 Share Posted May 27, 2015 I think big num has brembos on his car, maybe worth dropping him a PM Quote Link to comment Share on other sites More sharing options...
Big Mark Posted September 22, 2016 Share Posted September 22, 2016 Did you ever resolve this Mike? Quote Link to comment Share on other sites More sharing options...
Glanza_Mike Posted September 22, 2016 Author Share Posted September 22, 2016 Hey Mark, I'm not actually sure there was ever a problem to be honest. Or if there was its gone now, I drove a friend's car recently with fully refurbished UK specs and my brakes felt quite a bit better in terms of stopping power. We went on a quite a long drive and I had no fade what so ever either. Quote Link to comment Share on other sites More sharing options...
Big Mark Posted September 22, 2016 Share Posted September 22, 2016 That's good to know! Mine still aren't fitted. Needed to get 19s" in the end, which arrived this week, but am about to have engine rebuilt and am going single so still 2-3 months off. Give's me time to sort out the paint on them from the chips and grinding a couple of mm off in an attempt to get my 18s" over them. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 22, 2016 Share Posted September 22, 2016 A lot of kits come with junk pads, as decent pads cost a LOT of money in those sorts of sizes. Quote Link to comment Share on other sites More sharing options...
Big Mark Posted September 22, 2016 Share Posted September 22, 2016 (edited) Front pads for these brakes are exactly the same size as R35 GTR pads, that's why I ordered a set of you R35 front pads a while ago Chris. Edited September 22, 2016 by Big Mark (see edit history) Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 22, 2016 Share Posted September 22, 2016 That's useful to know, thanks, and I have some more on the shelf if anyone needs fast road pads for Greddy 6 pot fronts! (Or for an R35 GTR front or rear) Any idea what the rear Greddy 4 pot pads are also fitted to Mark? Quote Link to comment Share on other sites More sharing options...
Big Mark Posted September 22, 2016 Share Posted September 22, 2016 That's useful to know, thanks, and I have some more on the shelf if anyone needs fast road pads for Greddy 6 pot fronts! (Or for an R35 GTR front or rear) Any idea what the rear Greddy 4 pot pads are also fitted to Mark? Mine and Mike' aren't Greddy's. We have the Brembo 6 & 4 pot Calipers from the Jeep SRT-8. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 22, 2016 Share Posted September 22, 2016 Ahh, got you, I thought it odd some Greddy calipers took such huge pads. Those calipers are similar to the Cadillac ones I think. Quote Link to comment Share on other sites More sharing options...
Nic Posted September 22, 2016 Share Posted September 22, 2016 Ahh, got you, I thought it odd some Greddy calipers took such huge pads. Those calipers are similar to the Cadillac ones I think. The GReddy calipers are made by Alcon I believe. I don't know if this will be of use but there are tech drawings of aftermarket brake kit pads here http://endless-sport.co.jp/products/brake_pad/RacingCaliperPad.html It may be possible to cross reference the part numbers with the car manufacturer lists here http://endless-sport.co.jp/products/brake_pad/car_list.html Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted September 24, 2016 Share Posted September 24, 2016 Hey, that's great, thanks Nic, appreciated. Quote Link to comment Share on other sites More sharing options...
Angarak Posted September 24, 2016 Share Posted September 24, 2016 ...please ignore this post, made in error... Quote Link to comment Share on other sites More sharing options...
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