pzr2

iTrader: (3)

Hello everyone,

I've done some searching around for some brake hydraulic upgrades. I was particularly interested in the 929 MC/Booster swap until I spent most of the day looking for a decent 929 at a local junkyard. Only one yard has a 929 in the whole flipping metropolis of Phoenix and it's probably already ransacked of the goods.

More research got me interested in both the Wilwood universal 1-1/16" MC and the Subaru Legacy MC/Booster (which is infinitely more common). I'll start with the Legacy:
-What years will work with an '87 T2? all I could find was "early 90s"
-How does the power booster compare to that of the 929? Or that of the other Hondas/Nissans that supposedly work as well?
-How does the overall MC/Booster package on the Subaru compare to that of the 929?
-Does the Subaru's MC use an external proportioning valve?
-Are there any other Subaru models that have the same bolt-on capability? Obviously the Outback, but what about the Forrester/WRX/etc.?

As for the Wilwood:
-What power boosters will the Wilwood bolt up to?
-How does it compare to that of the 929, Legacy, etc.?

All of this is going to be combo'ed with rebuilt turbo calipers, Goodridge lines, DOT 4 fluid, Hawk HPS pads, fresh rotors, MC brace, and an adjustable bias valve.

Help would be greatly appreciated!

clokker

iTrader: (2)

All of the suitable "big MC" setups you'll find (929, Honda, Nissan and Subaru) have double diaphragm boosters, your car came with a single diaphragm unit.
That's the big difference, not between the double units themselves.

All of them are similarly sized/packaged...they all fit.

Yes, they all use external proportioning valves, with the exception of certain Nissan MCs which have one integrated.

Almost any 90's+ Japanese booster/MC can be swapped in, the mounting platform is very common.

I'm not sure what the Wilwood mounting spec is, the only time I've ever used them I built a twin cylinder, unboosted setup for my Z car.

pzr2

iTrader: (3)

Okay, sounds good. I went and picked up a booster and MC out of a 99 Legacy Outback today. While I'm extremely happy with my purchase, I'm also really confused about how exactly this is all supposed to mate up together.

-The most obvious difference was the brake booster's size: it protrudes forward much farther. Since the proportioning valve (block?) is mounted on a bracket attached to the master cylinder and thus moved forwards with the new one, how exactly did you reroute the hard lines to the FR and rear brakes? Did you somehow wiggle a little extra length out of those lines by bending them? Did you make a new mounting bracket? Or did you altogether replace the hard lines and start from scratch? In that event, how much harder (or easier) would it be to install an adjustable proportioning block?

-What is the actual size of the Subaru's fittings? Are the flare nuts and the pipe diameter the same as the RX7's? Just eyeballing it, the Subaru seems to have bigger fittings but uses a similar sized pipe (3/16"?)

-What exactly do you need to do to get the fluid fill sensor to work? Can you use the existing one or do you have to swap in the RX7's?

Thank you for the help by the way!

clokker

iTrader: (2)

The Subie fittings are 10mm x 1, just like the FC.

While at the yard, I grab all the short brake lines I can find and turned them into this:


You should be able to just connect the low fluid sensor but I'm not positive since I never have bothered.

pzr2

iTrader: (3)

Do you have a picture of when you had your Legacy unit in the car?

fc323

So any 90s Japanese import have the brake booster that will fit? And for any series?

clokker

iTrader: (2)

This is a 1" bore Integra setup in my FC:


And here's the 1 1/16" bore Subie unit in the FD: