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R32 Vs S13

joh21m
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joh21m Collaborator

joh21m

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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 by joh21m
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MerlinTheHapyPig Mentor

MerlinTheHapyPig

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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 by MerlinTheHapyPig
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BHDave Grand Master

BHDave

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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.

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joh21m Collaborator

joh21m

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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

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MerlinTheHapyPig Mentor

MerlinTheHapyPig

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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...

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cefiro Experienced

cefiro

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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

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joh21m Collaborator

joh21m

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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???

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MerlinTheHapyPig Mentor

MerlinTheHapyPig

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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.

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cefiro Experienced

cefiro

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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.

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NateR31 Grand Master

NateR31

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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.

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joh21m Collaborator

joh21m

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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???

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