Thread: AD22 swap questions

I got a JDM Nissan sunny which has become my project.
came from factory with solid front disc brake and drum at the rear
also had a single diapharm booster and 3/4 master cylinder

i have since upgraded to AD22VF, SS brake lines and double diapharam booster but my pedal travel is still not adequate.

would the Master cylinder be the culprit of this?

Yes. You should swap a 7/8 master cylinder.

Define "not adequate."

Do you have too much travel, or too little?

A larger master cylinder will shorten pedal stroke, but increase effort.

A smaller cylinder will decrease effort, but lengthen stroke.

The typical setup with AD22VF is to use a 13/16 master cylinder, which is just a little larger then what you have.

Do you still have the drums in the rear? What proportioning valve are in the system?

That sounds like the USDM non-SER (B13) set-up.

You want an SER/NX2K (B13) rear disc set-up and an NX2K master cylinder.

That would then duplicate the brakes on a USDM NX2K (B13) and therefore the proportioning will be factory correct per Nissan engineers.

OR...for a bigger OEM+ upgrade....

You could get the rear brakes from a Maxima/P10 and an Altima master cylinder. That duplicates a European B13 factory set-up, proportioning will be spot-on.

Per this thread, direct link to pertinent post by icerace2:

http://www.sr20-forum.com/suspension/30432-brake-thread-7.html#post468259

Someone please correct me if I am wrong.

If you are swapping to rear discs, you should absolutely go P10 calipers / Altima mc. Same amount of money and work, better brakes

Not adequate is too much travel the travel improved when i swapped over to the double diapharm but still too much travel.

still have the drums not in a hurry to change to the disc rear yet.

proportioning valve would be in the master cylinder as my car has 4 lines to the master cylinder

Here in Jamaica i could get the U13 bluebird master cylinder which i think is the 15/16 i just want to be sure the proportioning will be ok since i still got the drums at the rear

Doubt it.

Ok, you see the things screwed into the "R" ports on this M/C? Those are the proportioning valves, which limit the pressure to the rears to keep the brake bias to the fronts.

If you have valves like that (and the fittings are the same), you should be able to move them from your existing M/C to a larger one and keep the pressure down to the rears while shortening the stroke.

^^^ yea got those on my current master cylinder, so i would just swap those to the U13 master cylinder and should be ok with the drums and when i do the Disc rear i just swap bk in the original U13 proportioning valves