joh21m Posted March 11, 2006 Share Posted March 11, 2006 (edited) Hi all, I put on some r32 discs and calipers onto my s13. I currently have the ca18det brake master cylinder and its crap. The pedal is wayyyy to spongy. My question is, which is a better upgrade, the r32 rb20det or s13 sr20det master cylinder??? Do i need to change the brake booster as well??? Thanks, Joh Edited March 11, 2006 by joh21m Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/ Share on other sites More sharing options...
KAWAII_hachi_roku Posted March 11, 2006 Share Posted March 11, 2006 so the conversion of five stud? Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2011634 Share on other sites More sharing options...
joh21m Posted March 12, 2006 Author Share Posted March 12, 2006 so the conversion of five stud? no i kept the 4 stud... anyone know the answer to my question??? Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2012297 Share on other sites More sharing options...
Baz Posted March 12, 2006 Share Posted March 12, 2006 R32's run larger brakes calipers so I imagine the R32 one would be better.. but who knows they could be exactly the same. Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2013386 Share on other sites More sharing options...
MerlinTheHapyPig Posted March 12, 2006 Share Posted March 12, 2006 (edited) have you bleed the brakes correctly? i have plenty of friends who have used stock s13/sr20det master cylinder w/ r32 and r33 brakes with no problems, but sr20det master cyl is better than ca18det. Re-bleed the brakes and see if you still have trouble... I'd suggest using an sr20det master or rb20det (if it bolts up easily). Your problem is most likely due to bleeding brakes, but i'd play it safe and use the sr master Edited March 12, 2006 by MerlinTheHapyPig Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2013502 Share on other sites More sharing options...
BHDave Posted March 13, 2006 Share Posted March 13, 2006 Due to the increased volume of fluid being moved and the altered bias as a result of the caliper change i'd be swapping the master. If you have swapped on r33 brakes all round then a 32/33 gtst master is the go. If you have maintained the s13 rear brakes then look at an s14 master as it has the 4 pot front, single pot rear combo from factory. That way you have a master that can cope with the changed brakes for both volume of fluid moved and bias. Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2014560 Share on other sites More sharing options...
joh21m Posted March 13, 2006 Author Share Posted March 13, 2006 have you bleed the brakes correctly?i have plenty of friends who have used stock s13/sr20det master cylinder w/ r32 and r33 brakes with no problems, but sr20det master cyl is better than ca18det. Re-bleed the brakes and see if you still have trouble... I'd suggest using an sr20det master or rb20det (if it bolts up easily). Your problem is most likely due to bleeding brakes, but i'd play it safe and use the sr master yeh i've got the ca18det master cylinder and it sucks... i've bled the brakes and it didnt help... thanks for the info! Joh Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2015418 Share on other sites More sharing options...
joh21m Posted March 13, 2006 Author Share Posted March 13, 2006 do you think changing the brake booster will help also??? i have the ca18det booster... Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2015502 Share on other sites More sharing options...
R34GTT-R Posted March 13, 2006 Share Posted March 13, 2006 Get a Z32 master and ANY double diaphram booster. Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2015637 Share on other sites More sharing options...
MerlinTheHapyPig Posted March 13, 2006 Share Posted March 13, 2006 i don't think brake booster is as important as master cylinder, however i suggest you consult an expert because i don't know for sure. All the brake booster does is use vacuum from the car's engine to multiply the force on the master cylinder, it's just a diaphragm and a valve, so i don't think it really matters, but someone might want to confirm this... Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2015723 Share on other sites More sharing options...
cefiro Posted March 13, 2006 Share Posted March 13, 2006 Just from when I pick my master up, they said that the late model S13 was the same as the R32 gtst. Here is some info for you. on the side it will say BM then a 2 didgit no 33, 44, 50, 57 indicating bore size. Bigger no. is bigger bore. I got one from a S13 late model Its BM 44. Supposidly the same as a R32 gtst. Mine should be in by the weekend and I will let you know the outcome. I have a 300zx ABS model in mine at the moment but its only a two port (one port for the front and one for the rear) the new one is smaller bore size but has 3 ports. If you dont have ABS then you will need a 3 port non ABS master. hope that makes sence Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2016589 Share on other sites More sharing options...
MerlinTheHapyPig Posted March 14, 2006 Share Posted March 14, 2006 r32 gts-t type m is BM 44 Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2017545 Share on other sites More sharing options...
joh21m Posted March 14, 2006 Author Share Posted March 14, 2006 Just from when I pick my master up, they said that the late model S13 was the same as the R32 gtst. Here is some info for you. on the side it will say BM then a 2 didgit no 33, 44, 50, 57 indicating bore size. Bigger no. is bigger bore. I got one from a S13 late model Its BM 44. Supposidly the same as a R32 gtst. Mine should be in by the weekend and I will let you know the outcome. I have a 300zx ABS model in mine at the moment but its only a two port (one port for the front and one for the rear) the new one is smaller bore size but has 3 ports. If you dont have ABS then you will need a 3 port non ABS master. hope that makes sence wow thanks heaps for that info...the guy who is sending me the m. cylinder said the code on the side was BM44... yeh let us know how it goes, do you have a s13 with the r32 brakes up front also??? Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2019464 Share on other sites More sharing options...
cefiro Posted March 14, 2006 Share Posted March 14, 2006 got S14 up front but about to get some GTR calipers and rotors during the week and hope to have the new BMC and brakes in over the weekend providied I can sort out fitting with enzed or pirtec Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2019843 Share on other sites More sharing options...
joh21m Posted March 16, 2006 Author Share Posted March 16, 2006 got S14 up front but about to get some GTR calipers and rotors during the week and hope to have the new BMC and brakes in over the weekend providied I can sort out fitting with enzed or pirtec sounds good, let us know how it all goes... Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2024642 Share on other sites More sharing options...
joh21m Posted March 18, 2006 Author Share Posted March 18, 2006 well i found out my car already has the correct master cylinder (BM44). so i went to bleed my brakes. Put new fluid in (castrol super response dot 4) and the brakes are still shit!!! so frustrating anyone know what it might be??? i need the brakes to be touchy not all mushy! Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2029994 Share on other sites More sharing options...
MerlinTheHapyPig Posted March 18, 2006 Share Posted March 18, 2006 the most likely explanation of your problem, is that the brakes haven't been bleed properly. Make sure you are using the correct procedure to bleed the brakes, sometimes they can be a bitch because air bubbles can get stuck in the lines, just make sure you do it in the correct order and keep pumping pedal until no bubbles come out. Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2030330 Share on other sites More sharing options...
cefiro Posted March 18, 2006 Share Posted March 18, 2006 Try the bleed again, start with the longest line first passenger rear then driver rear, then passenger front then driver front. Are you useing two people to bleed it???? 3-4 pumps then hold foot on the floor then close the nipple. then return the pedal to normal. then Start again. Normally will take a couple of bottles to flush a whole system. Also have a look at your brake booster, is it a double diaphram. just to see, if it has two distinct round cylinders, rather than just the one. if its two then its a double diaphram, I dont know if that will influence anything though. Also if you dont want the master let me know I may have someone willing to buy it from u. Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2030468 Share on other sites More sharing options...
NateR31 Posted March 19, 2006 Share Posted March 19, 2006 i had this problem once, you can damage the the master by incorrecting bleeding, like pumping it too hard. the way i bleed, is from the furthest to the master and work your way, three pumps. and bleed, three pumps and bleed ect.. But not super hard thats how you damage, you can break the seal. Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2030740 Share on other sites More sharing options...
joh21m Posted March 19, 2006 Author Share Posted March 19, 2006 i had this problem once, you can damage the the master by incorrecting bleeding, like pumping it too hard. the way i bleed, is from the furthest to the master and work your way, three pumps. and bleed, three pumps and bleed ect.. But not super hard thats how you damage, you can break the seal. how do i know if the master cylinder is damaged??? Link to comment https://www.sau.com.au/forums/topic/109205-r32-vs-s13/#findComment-2031048 Share on other sites More sharing options...
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