Master Cylinder For R33 Brakes

[daisu]

Hey people,

I'm about to purchase myself a set of front and rear R33 calipers/discs, and from what I understand the R33 uses a BM50 as opposed to the R32 (current calipers and master cylinder) being a BM44.

So my question is, does the BM50 fit the same as S13/A31/R32 master cylinders, if not is it as simple as borrowing a pair of tube benders? Or would it require custom brakes lines? Or is there an alternative (Z32 brake master?) that will fit with no modification?

Or are people just using the R32 BM44 with their R33 brakes?

thanks.

[Hella Flush]

running stock booster/master cyl combo atm... its a wee bit soft...

really need to get an upgrade

im probably going to go with 32 gtr/r33 gtst

[daisu]

From what I understand R33GTST requires bending of the brake lines to fit, I don't know how much bending (I can use a pair tube benders if I need to, but I don't want to have to get new custom lines made up)

And I was thinking R32 GTR, but weren't they all equipped with ABS? (Master cylinders only have 2 outlets for ABS)

If 32GTR came out without ABS then I think that would be the brake master to get.

[Resin]

- i used a r32 gtst master cylinder bm44 ...it is exactly the same 3 outlet design all in the same position and is a straight bolt on ...hard to find though all wreckers didnt have one except for pick and payless and it was on a r30 but it was the only r30 that had one. The rest like the r31's use a pbr brand master.

- The r33's use a 2 outlet one (abs) still a bm44 though from memory. Same with s14's (did they all come standard with abs?)

- I think the gtr uses bm 50(r32gtr) or 57(r33gtr) which i think is 2 outlet.

- Nissan pintara FWD U12 uses a bm44, 4 outlet design. It has similar sized brakes to a stock turbo cefiro.

[daisu]

At the moment I'm using a BM44 with the R32 calipers, I guess I'll just have to wait until I have the R33 calipers on then make a decision about whether I need to upgrade.

[Resin]

At the moment I'm using a BM44 with the R32 calipers, I guess I'll just have to wait until I have the R33 calipers on then make a decision about whether I need to upgrade.

its should be fine thats what im using for my r33 calipers front and rear.

[robots]

How is the pedal feel with bm44 ?

[Resin]

fairly similar but yea a little softer but no way near the floor.

[Cash31]

The BMC in my A31 is a BM50, but it is the 2 port version as it has ABS.

The biggest 3 port BMC in Nissan Australia's database is the BM50 (1"), as found on R32 GT-R N1's.

These are the part numbers:

(5) #46010-05U01 | *RB26DETT.GT-R.17 | Tokico 1" N1 Specification

(6) #46010-05U21 | *RB26DETT.GT-R.17 | Nabco 1" N1 Specification

They retail for around $530 brand new, and you'd be lucky to find a second hand one.

Cash

[daisu]

Ah yes, I found this info the other day but I couldn't remember where. Do you have a link to the page (was something like a writeup about some guy doing the 33GTR brembo caliper conversion on his S13.

As for the $530 brake master, I think it would be cheaper to just fit the corresponding brake master (in this case, the R33 GTST) and then have the brake lines modified to fit. Hell, for the savings made on the BMC, you could probably have completely brand new lines made to fit.

Edited September 13, 2007 by daisu

[Cash31]

Ah yes, I found this info the other day but I couldn't remember where. Do you have a link to the page (was something like a writeup about some guy doing the 33GTR brembo caliper conversion on his S13.

Yes it was. A friend was/is doing a ground up S13 build and has done all research on master cylinders.

Link to the the blog:

Sillbeer

Cash

[Resin]

the reason i went with the bm44 with the 3ports was because r33's use a 2 port BM 44 not bm50 ......so i felt it was fine. I know this cos the car i took the r33 brakes off had the bm44 on it but it was abs and 2 port so i didnt take that and when and found a non abs one instead ...which too awhile to find.

[daisu]

I also read somewhere else that even though the R33 is still called BM44 that the piston diameter was smaller than the R32 BM44?

[Green_s13]

i'm running the r33 brakes on my skyline with no drama's the pedel is a touch softer but not much, and i have had no issues at the track, i dont think you will need to change yours

[daisu]

Aight, well I sold my R32 brakes last night, and I have my R33 brakes here, just waiting for a mate to get the discs redrilled, then I'll be seeing for myself how it is

[Cubes]

The pedal shouldn't feel softer when going from the R32 GTST to R33 GTST brakes.

It should feel better.

The R32 GTST and R33 GTST callipers are identical in piston dia; so the same amount of fluid is displaced.

The difference is in their mounting position. The R33's are spaced away from the hub more so to allow the use of a larger dia rotor.

The larger dia rotor with the same calliper offers increased leverage when stopping the car; so less brake pedal effort/travel is required to slow the car.

If the pedal feels softer its possible the callipers require an overhaul or you disturbed the master cylinder during bleeding.