A new M/C for my S13....

[skydragoness]

I have a dilemma, I'm soon to put on a set of Z32 26mm calipers on my car, I already have the appropiate stainless lines (z32 front, w/ fittings and 240sx rear lines--from Heavythrottle), and a rebuild kit for the calipers. I do not plan to add Z32 rear brakes later on.

My master cylinder, from what i know, has not been replaced. I have 104k on the clock, and i was curious on whether i should get a new OE m/c, or a Z32.

BUT

Flipping thru what the search button found for me, i came across a statement saying that the S12 m/c has the same ratio/same size as the Z32 and is cheaper, and easier to install.

Is this true?:help

[SHIEF]

I don't know what you mean by "easier to install" because it is a piece of cake either way. Now as far as price, I got mine brand new (not rebuilt) for $140. If I were you I'd get the Z32 MC. Just make sure you get the Nabco brand MC, so your stock brake lines will go right in. 1" or 1 1/16", that really doesn't matter.

-Brandon

[Tictakman]

ya u need to get the 32 mc bc otherwise the pedal will feel really mooshie and soft when depressing

Zak

[skydragoness]

Ok, i'll rephrase.

What i got from what i saw about the S12 m/c was the fact that it's cheaper than the z32's and the same ratio 1 1/16 etc etc.

I wasn't sure about what was easier to install or not, because i read that there is some bending of the lines to the m/c on the s14 that i'm assuming you do not have to do for the s13

[SHIEF]

Although the bore (1" 1/16) might be the same I highly doubt that the proportioning valve in the MC will flow enough fluid for the Z32 brakes. Bottom line, just get the Z32 MC. Yeah you have to tweak the S14 lines a little. Make sure that the MC is a ABS MC and is made by Nabco, otherwise you have to change the fitting on your brake line if it's not.

[skydragoness]

So, s14's need tweaking of their m/c lines? while s13's do not? And i do not have ABS.

[extheflow]

i'm using an oem s14 MC with my Zbrakes. and the pedal feel is far from mushy. try putting the calipers on and seein how it feels before you go buyin stuff you don't need.

[SHIEF]

I know you don't have ABS, I'm saying to get the ABS Z32 MC.

[skydragoness]

i'm using an oem s14 MC with my Zbrakes. and the pedal feel is far from mushy. try putting the calipers on and seein how it feels before you go buyin stuff you don't need.

hell yes. this is what i was thinking.

the only reason i brought up the issue. Is that i'm unsure if my car should just have the m/c replaced to be safe. My rear brakes are relatively new (from around Sept, Oct ) The front rotors are slotted, and are pretty old, from late early fall 02'. But the pads are ceramic and were put on around the same time the rear brakes were done. Pedal feel currently goes from normal (on the soft side) to very firm (little play) after hard braking. I'm not sure if this is an M/C issue or if new fluid is needed, or just a symptom of old rotors.

Either way. I need to get this done soon.

[extheflow]

probably from old rubber lines more than anything,putting the stainless lines on there will take probably care of it.

[llamabeta]

probably from old rubber lines more than anything,putting the stainless lines on there will take probably care of it.

Werd.

I would feel it out first. If you replaced the complete system then I would get the master cylinder.

Also, in case you havent seen this yet:http://importnut.net/300zxbrakeswap.htm

[Onizuka]

The problem isnt brake feel, its that your back brakes will lock up first without the right MC. At least thats what i have read from several places.

You definatly dont want the back brakes to be squeezing more than the fronts.

[llamabeta]

Really J-Spec? I hadnt come across that. I couldnt see it being that big of a difference in terms of pressures. I suppose if you just stomped it to the floor from 70+ I could see that. Probably be more related to everything working together though. Rotors, tires, heat on them etc.Also by "feel" I meant how the car acts overall. I am going with the entire system myself. I'm almost there. I just need to get the front brakes and I'm set.

[skydragoness]

Jspec is right in bringing that issue up.

From what i've researched, only when you use a stock m/c with Z32 brakes ALL AROUND does braking start to exhibit rear bias issues. SCC put a Z32 Gran Turismo kit from Brembo on, and they were stupid enough to leave the stock m/c (perhaps on purpose to prove a point) the car's rear brakes actually locked up first. In that scenario the Z32 m/c was mandatory.

Extheflow, your'e right on man. It is probably my rubber lines, and perhaps the old fluid that's being pushed thru (i don't think they were properly bled before). Once i get the extra things i need to start this job i'll try it out with the stock m/c. And see how it goes from there. I'm only putting front z32 brakes on, there may not be an issue at all, just better braking!