R32 Master Cylinder Changeout

[Ronin 09]

surely someone from a workshop/wrecker would have a R34 and R32 master kicking around and could compare the mounting, geometry etc...?

[Gav]

Thanks

I'll probably bite the bullet and get one from Japan.

Not getting any response from RHDjapan - anyone know another supplier of OEM parts from Japan (and I don't mean Nissan Australia!)

[Ronin 09]

doesn't Just Jap do a bunch of OEM stuff at reasonable prices?

[NoFX_Hardcore]

I also couldn't confirm how much mucking around but I have a 32 gtr with a r34 master cylinder... Here's a pic of my engine bay... sorry bout the smallish pic but its best I got atm. can take more on the weekend if anyone wants.

[djr81]

Yes please, want want.

[sav man]

what's the diference between the R33 and R34 m/s?

[32R]

Has anyone done this yet:)

[sav man]

I'm waiting for my R33 ms to arrive next week.

[Risking]

The r34 master is a direct bolt on there is no pysical difference. They are still the same bore size as the R33 from memory ( 1 inch)

Internal proportioning is terrible with the Z32 master. You can use a master from a GU patrol but they dont have any proportioning as its done externaly according to the load in the rear.

Protex do cheapish bolt on OEM replacement master cylinders for nissans from 15/16th right through to 1 1/8th. Both with and without internal proportioning.

I have used all 4 available sizes with my old brake set-up (willwood 4 spot callipers, QFM pads)

I found the 15/16ths was far to small and resulted in a very long pedal

The 1 inch was okay but the pedal became long and the proportioning was not perfect once the fronts were up to temp

1 and 1/16ths was the pick of the bunch. It had a brilliant pedal feel and the internal proportioning was just about perfect.

1 and 1/8ths was to big. the pedal was far to hard and braking pressure had dropped substancially. It required at lot more pedal input to get them to work decently. Would have been okay with bigger pistons but not for what I had at the time.

From there I went and tried the external proportioning valve with the larger too options and again found the 1 and 1/16ths master to be the best and combined with the willwood valve I could get the bias perfect and consistant.

The only problem with the protex master cylinders is that not all of them are available with the two port body to suit ABS equiped cars. From memory the external proportioning masters were three port only (non ABS) and the 1 and 1/8ths was the only one with an internal valve that was not available with two ports (ABS fitted)

I still have a few of them around which have done maybe 20K's of circuit work if anyone is interested in trying them on their own braking set-ups. I just went through an expensive stage of trial and error looking for the right master combination.

I got the shits with it all and went twin masters on a pedal box in the end!

[sav man]

does the r33 master have a decent bias?

[sav man]

I put my R33 Master on today. The R33 is 1 1/16 in size (it's cast on the ms) and the external dimentions are identical to the R32. I put them side by side, and i know it's a R33 one as i pulled it off the car.

It's great to have a pedal again. I'm at the track tomorrow so i'll be keen to see the diference in feel on the track.

[LotusGTR]

Fantastic thread. Just what I need. So, the R32 m/c seems to be the same as the R33, except for the bore is up by 1/16"? That being the case I need an R33 m/c that is either reco'ed, in great condition, or is new. Where from?

[discopotato03]

I went into this a while back and this was what I found at the time .

The R33 GTS25T BMC is 15/16 bore and mine is non ABS so it has 3 ports , one pointing 45 deg downwards and has a hexagonal steel bodied thing which I take to be it's proportioning valve .

ABS masters only have two ports - one for front and the other back - via the ABS unit of course .

If you search the American boards they go into the differences between Nabco and Tokico branded BMC's for Nissans but , that but again . You pretty much have to ignore part no's for LHD cars because usually the steel lines exit the BMC on the opposite side to RHD cars BMC's . Some of their sites quote proportioning line pressure limits and the general opinion is that Z32 BMC proportioning is wrong for anything but a Z32 , they must be very front heavy cars .

Also something worth considering is that in years gone by Nissan and Subaru used same/similar components in some areas so BMC's from RS Turbo Libs and Ram Raider may be worth a cursory glance . Don't quote me but 99+ Rexes with four piston/two piston brakes are very similar hydraulically to some R32/33/Z32's , the rear ally two piston calipers are almost identical dimensionally .

I'm glad to see quotes in the 3-400 range because when I asked at John Robinson Nissan in Rockdale (Syd) the numbers were huge .

I'd like to know more about Protex if possible , cheers A .

[Gav]

I forgot about this thread.

I ended up ordering in the R32 V-Spec (Brembo equipped) master cylinder through Nissan. This is a 1" (up from 15/16" standard).

Fitted up without problems and gave a great feel to the larger braking system I've got installed (CSC calipers front and rear). Travel is noticeably reduced. Probably could have gone to the N1 (17/16") item for an even better feel.

In summary, if you have an old/leaky master cylinder and are fitting bigger calipers, then it's a good upgrade. Price is on the north side of $350, however.

[LotusGTR]

I forgot about this thread.

I ended up ordering in the R32 V-Spec (Brembo equipped) master cylinder through Nissan. This is a 1" (up from 15/16" standard).

Fitted up without problems and gave a great feel to the larger braking system I've got installed (CSC calipers front and rear). Travel is noticeably reduced. Probably could have gone to the N1 (17/16") item for an even better feel.

In summary, if you have an old/leaky master cylinder and are fitting bigger calipers, then it's a good upgrade. Price is on the north side of $350, however.

Er, R32 GTR V Spec? It seems to have been suggested above that the std R32 GTR size is 1" and the V Spec is 17/16"? Where did you get this from, for $350? Nissan are quoting me $500-$600 and have 6 different types to choose from. I need to supply them a chassis number for them to know which one, as the details are all in Japanese. It's a shit fight!

[sav man]

std GT-R is 15/16, not sure on the vspec, but the R33 is 17/16.

[djr81]

This is to the best of my understanding. The R32 Gt-R's with Sumitomo callipers had 1" BMCs according to the shop manual. Brembo equipped R32's had 17/16's BMCs. N1's with Sumitomos (Or Nismo versions if you like) has 15/16's with no ABS & Brembo equipped N1's had 1" BMC's. Cars without ABS have 3 outlet BMC's.

Brake master cylinders for R32 Gt-R's.

Part numbers are stamped on the end of the master cylinder. There appears to have been two different part numbers available for most build dates. This may be as simple as Nissan sourcing master cylinders from two different manufacturers - Tokico & Nabco.

Stock model:

Build dates from 8908 to 8911

Part number 46010-05U20

Size 1"

Build dates from 8911 to 9108

Part number 46010-05U00

Size 1"

Build dates from 9108 on

Part number 46010-05U20

Part number 46010-05U00

Size 1"

V-Spec model, ie with Brembo brakes.

Build dates from 9302 on

Part number 46010-05U02

Size 17/16's.

N1 versions.

This gets confusing & may well be incomplete.

Early version appear to have 15/16" master cylinder sizes. I would guess (Note: NOT SURE) that they may well have three outlets rather than the normal two for stock GT-R's & have Sumitomo callipers. The number of ports relates to the presence of ABS. 2 ports for ABS, 3 for Non ABS. n Interestingly they appear to be smaller in size than their equivalent ABS equipped stock or V-spec GT-R's.

Any way:

Build dates 9002 to 9108

Part number 46010-02U00

Build date 9108 on

Part number 46010-02U00

The specification is listed differently for these units but is in Japanese on the spec sheet & I can't read it.

The alternate parts listed are here

Build dates 9002 to 9108

Part number 46010-02U20

Build date 9108 on

Part number 46010-02U20

Later versions had a 1" size.

Build date 9203 on

Part number 46010-05U01 for a Tokico unit.

Part number 46010-05U21 for a Nabco unit.

There may well be more options but that is the limit of my knowledge at present.

Edited September 3, 2008 by djr81

[LotusGTR]

Just in case people were still interested, today I had fitted a BM57, 17/16" BMC (to my understanding an R33 GTR item) to my R32 GTR with std Sumitomos. It is a straight bolt up item and the pedal feels great. I had a small leak in the old BMC so the new one will clearly be a leap forward, but certainly no adverse affect. The pedal is not noticeably shorter or harder. Having said this, I've only done light braking on it so far. A couple of Driver Dynamics nights at Sandown should see how it really goes.

After my current pads and R specs are are done, it's off with the 16" rims and on with some 18" and the APs....So long as I'm not homeless and lining up for free soup by then.....

Thought this might help.

[djr81]

Mine turned up the other week too. Has BM57 cast into the side & externally looks identical to the R32 unit.

[LotusGTR]

Tasty looking rotors in the background there......