Master Cylinder Question R32/33

[Mack_1982]

My brake master cylinder had gone in my 93 s1 gtst, I've read that you can replace your r33 cylinder with the r32 brake master cylinder, is this true ? And has anyone else done it ? Cheers

[GTRgeoff]

If the mounting holes line up it would be fine, but the 32 GTSt master is a larger diameter so would also give a firmer brake pedal/less travel for same braking force.

[nuffsaid]

Dayam aye, why is the R33 one smaller? You'd think less travel, more force would be better (except when you lock them up too easily)

[discopotato03]

I'm interested in this topic as well , my R33 is a little spongey and I'd like to know if the larger R33 GTR master goes on a non ABS R33 GTS25T . I'm not sure what bore master R33GTST's get but I reckon I could live with a sixteenth larger and new as well . Are the lines different ABS and non ABS ?

Cheers A .

[GTRgeoff]

R32 GTST

Master Cylinder diam (mm) - 25.4

R33 GTST

Master Cylinder diam (mm) - 23.8

R32 GTR (Non V-Spec,)

Master Cylinder diam (mm) - 25.4

R32 GTR V-Spec / R33 / 34 GTR with Brembos

Master Cylinder diam (mm) - 26.9

[Cubes]

Interesting Info Geoff.

Regarding a new master cylinder. Any good brake place will be able to recondition them. The local clutch and brake place here does reco brake masters for $120.

New clutch masters are $75 and slaves $30-$40

It would be nice to drop in the GTR's power assisted clutch master cyl. I fear it would foul the inlet manifold though.

[discopotato03]

I think I'll go new but are any of the 1" or 25.4mm bore masters a direct fit on a non ABS R33 GTST ?

Cheers A .

[discopotato03]

Silence , surprised people have not done to much in this area of an R33GTST .

How about some pics of the master cylinders on R32 and R33 GTR's , maybe even a Z32 .

Cheers A .

[Cubes]

Disco.

All clutch and brake supply parts to some of the import workshops.

The owner owns an R33 GTST and has done so for close to 6years so he's in to these cars and has done a lot of looking around for the aftermarket parts that are interchangable. He did mention one of the models has an aftermarket mastercyls from what I remember, however none for the R32's gtsts, the only option is new nissan or recondition.

They also know what aftermarket master/slave cylinders to use for the clutch etc..

So if they can't find something in the aussy aftermarket there simply isn't one.

You may find the r32 gtst master bolts up without issues.

Got pics? I'll grab some of mine if you wish?

[GTRgeoff]

Not done much??

My GTS25t has better brake pedal than the GTR. Certainly more feel and so I can brake right to lockup and control it with excellent feedback so I actually know which tyre is overbraked. I've posted plenty on it.

[discopotato03]

Ok no offense . From limited searches (not here-yet) it seems the difference between ABS and non ABS brake master cylinders is the number of hydraulic lines going out . The masters all seem to have three outlets , one rear and two front though the ABS ones have one front outlet plugged and no inverted flare under the plug . The Z32 may have different locations on the cylinder body to the Skylines - trying to sort out which suits what . If the R32 GTST is 25.4mm (1") and non ABS it may be a bolt on mod .

In the US they say some of their 240SX's (not sure if S13 or S14) used different assist level boosters (more for Auto) so need to find out what R32/3/4's have across the range .

Yes Cubes pics welcome . I would always buy Nabco or Tokiko masters new because my previous experience is that they are good things and fresh ones last for ages .

Cheers A .

[GTRgeoff]

As requested on the pics. GTR has only 2 outlets for the BMC and the offset bias chamber.

GTS25t

[discopotato03]

Thanks Geoff .

From globe trotting I found an interesting post at one of the I think S13/Silvia sites . They claim BMC's on later Nissans have a BM number that tells the bore size , mine has BM44 cast into it on the tower side .

BM33/38/44/50/57 equates to 13/16 , 7/8 , 15/16 , 1" and 1 1/16 - some have 17/16 meaning same thing .

They mention that only ABS cars like Z32 300ZX TT get the largest though I believe Brembo GTR do as well .

Americans like to fiddle with things like BMC's , etc , and they've done all sorts of conversions on Japanese Mechano kits (Nissans) .

You basically get four variations ie ABS/non ABS and Tokico or Nabco supplied BMC's . The ABS cylinders have two outlets (1 front 1 rear) and the non ABS three (2 front 1 rear) . The Americans found that ABS cylinders have a plug where the 2nd front outlet would be on a non ABS car . Its here that variations exist between Nabco and Tokico cylinders as to the type of plug and how it seats in the cylinder body . Nabco they say makes it easy with a hex head plug seating on the normal reverse flare steel fitting pressed into the cylinder body . This would be an easy upgrade to a non ABS car that needed a larger bore BMC .

Tokico make it a bit harder because their blanking plug is five sided (pentagonal socket) and they left out the reverse flare insert . Their answer was to hammer (shudders) a TORX bit into it and remove it that way , they then use a different non std flare to make it seal .

So unless anyone knows otherwise if I want a 1" brake master for an R33 GTST it will preferably be Nabco and from an R32 GTST/non V Spec GTR or R33 GTR non V Spec . I would then have to reform the steel lines because the R33 GTST uses a different style of BMC body and outlet position .

Is it possible for people with access to the above mentioned cars to have a look at the master cylinders and confirm if they are Nabco and have BM50 cast on their off side .

Cheers and thanks Adrian .

[predator]

Here is the piping config photo of r32 gts-t master cylinder if it helps..

http://www.project32.net/img/conv_emptybay03.jpg

I would have to confirm tonight as I could be wrong off memory.. But I believe when I checked this out a little also, mine has BM44 on the side -- sorry to say I don't think the R32 one is actually larger.

You're probably in luck reforming the lines r33 -> r32 as they're longer (if it was worthwhile).. but I was thinking of doing the other way around as its much easier to get R33 cylinder, but unfortunately I'd have to get them redone, as they're too short to fit the r33 positions

[discopotato03]

So possibly R32 or R33 GTR .

Cheers A .

[PHATR32]

my little adventure with the master brake cyliners, dunno if itll help or not.

http://www.skylinesaustralia.com/forums/in...=124212&hl=

[predator]

Yeah, confirmed by having a look .. definitely BM44 15/16 on my 32 .. not sure which brand - just says nissan on it.

Possibility I guess that the series2 R32 have a larger one, not sure.

[discopotato03]

Possibly . I did read somewhere that S15 Silvias may be 1" as well . Does anyone know if all Australian delivered S15's had ABS ? Also one of the Z32 300 ZX's may have a non ABS 1" BMC . US spec Z32's park the BMC and wheel on the wrong side of the car so the hydraulic lines come out of the opposite side of the BMC to RHD cars .

Cheers A .

[discopotato03]

Possibly . I did read somewhere that S15 Silvias may be 1" as well . Does anyone know if all Australian delivered S15's had ABS ? Also one of the Z32 300 ZX's may have a non ABS 1" BMC . US spec Z32's park the BMC and wheel on the wrong side of the car so the hydraulic lines come out of the opposite side of the BMC to RHD cars .

Cheers A .

Some pics of the Nabco Z32 300ZX 1 1/16 BMC . You can tell its Nabco because of the flat phillips head screw in the opposite side to the hydraulic line fittings . This screw is between the two front line outlets on Tokico BMC's . Note the Nabco cylinder on top of the Tokico box and its allen key type socket head plug which is removed on non ABS apps . The Tokico plug is a weird five sided socket . Also note the "BM57" cast into it . These 7 pics are of a US spec LHD Z32 300ZX Nabco BMC so RHD type BMCs have the screw and fittings on the opposite sides to this one .

Can GTR Geoff or anyone with an R33 GTR confirm the BM57 figures on their BMC and the Nabco brand . Also does anyone know if the manual and auto R33 GTS25T boosters are the same , some US spec Nissans use stronger boosters on auto cars .

Cheers A .

Edited January 18, 2007 by discopotato03

[AzzurrA]

i will have a look at my BMC when i get home from work this morning and post up what i find... i have a 92 model (series II) R32 GTS-t