R32 Gtr Brake Master Cylinder

[T04GTR]

hi all. just wondering if theres a master that doesnt have a built in proportioning valve in it.

basicly i need to let more pressure go to the rears.

ive aftermarket calipers front and rear. and the front is working to hard. i want to instal a hydrolic bias valve instead of the factory one. to evan out the brakes.

any info apreciated. cheeres

[james.341]

hi all. just wondering if theres a master that doesnt have a built in proportioning valve in it.

basicly i need to let more pressure go to the rears.

ive aftermarket calipers front and rear. and the front is working to hard. i want to instal a hydrolic bias valve instead of the factory one. to evan out the brakes.

any info apreciated. cheeres

thats right

[T04GTR]

and....

[T04GTR]

or. can the valve be removed from it? whats the race ones do?

[T04GTR]

cool it just unsrews.

[Duncan]

ever feel like you are talking to yourself dave?

[sav man]

so can you just replace it with a diferent strenghth spring to change the bias? or do you need the hydrolic adjuster?

[Risking]

get hold of a D22 navara master cylinder, same diameter but slightly different pipe locations.

no propotioning valve there

Edited March 25, 2007 by Risking

[T04GTR]

sweet. thanks guys. yeah theres an alloy cap over it. i thought it was a press in plug. but as i was drilling it it fell off and revieled an 8mm hex screw

but it will have to wait while i get new front discs again! i thermaly shocked them. big massive crack down one of them from over heating. uber gay!!!

so some nice alcons are going in. and lol i dont know where id be with out my weekend job at autobarn. coz this is turning quite expencive

[djr81]

Um, Dave. Can you provide any more info on the calipers (maybe in the other brake thread) ie model #'s, piton sizes, stuff like that?

[T04GTR]

the alcons are 41.3 and 44.5 mm.

the brembos are 38 and 44mm. both using a 132mm long by 50mm pad

[T04GTR]

cool. quick update. the valve is removable but... with no valve there fluid pisses out the tiny little breather hole thats inbetween the outlets. ive got a s15 master that im gonna chop in half to see whats going on inside lol.

[T04GTR]

ok. a silvia master is the same. (s15) but has a stronger spring for the proportioning valve. it reduces by 20% not 40% like on the gtr. il just stack it up abit and use my tilton bias valve

[T04GTR]

woops bleeding all over the engine bay lol.(forien orders at work ftw hehe)

[BRUNSKIGTST]

ummmm can u hook me up with a GTST master repair kit for R32 i cant find repair kits or aftermarket where i am

[T04GTR]

umm no. ring nissan. i have a gtr not a gtst. but i do have cylinder that fits i can sell you. its a s15 one. with a 1 inch bore wich is better then the 15/16 bore of the gtst.

[dontfeelcold]

Just an idea, what about using a pneumatic cylinder instead of the spring, just change the pressure to change the bias?

[T04GTR]

nar. il get a patrol master. i tried with a early 15/16 cylinder and it was worse. but it think its the fact there an imbalance on the size of the pistons in the calipers

[discopotato03]

Front brakes working too hard ? I think that equates to rears not working hard enough .

When I was researching master cylinders for Skylines I did read that rear line proportioning valves were set differently for Z32's and 240 SX's . It may pay you to find out what our spec S14's and S15's are using and maybe substitute one of theirs . I did see somewhere that some S15's had a 1" BMC (should have BM57 stamped on the blind end) so if its bias is different (one would imagine an S15 would have substantially different front/rear weight balance) it may be the solution .

Cheers A .

[discopotato03]

Another update , whilst ratting 1st Gen Liberty bits for the RX I found that they use a Nabco 1" BMC with either 4 or 3 outlets and they appear to be a single cylinder body ie no proportioning valve . There are also available plugs so that any unused BMC outlets can be sealed safely . In the app I'm using cars could have 3 or 4 outlets so I went 4 to cover all the bases .

These Liberty BMC's have outlets facing down and towards the offside of the bay so the horizontal ones would be the ones to plug for a two line Nissan ABS type car .

I can't be totally certain these interchange with Skyline BMS's at the booster but the mounting system looks identical .

Cheers A .