I'm converting my Rx7 to manual brakes (no booster).....

Here goes I've bought a 1-1/8 bore master cylinder for this job. Except when I finally got ready to install it this weekend, I found that it only has one outlet fitting.

Do I branch this into 4 outlets?

Or do I run dual masters (one for the front and one for the rear)

here is the kit



Other facts about my brake set up....

4- 4 piston calipers

2- 12 inch disc's front

2- 11 inch disc's rear

1- proportioning valve with in-cabin control


Hope someone can help me out!

Thanks in advance!

 

Anybody?

 

No offense, Jimmy, but I suspect you're in a little over your head. The braking system is NOT something to take lightly, so please be careful with this project.

FWIW, I don't know anything about FB brakes. But your setup sounds all custom, so maybe I can help a little.

First off, how did you choose the MC size? What are the caliper models & piston sizes? How about the pedal ratio?

 

Assuming your front & rear calipers are the same size, then the 1-1/8" master is too big to make enough pressure to operate the front calipers.

Note: big piston master = low hydraulic pressure

Think pressure not volume.

If you want to do it right, get a dual Tilton master cylinder assembly, and start off with 3/4" diameter front master and a 1" diameter rear master. The dual Tilton master cylinder assembly has worked well on my road race car since the last century

 

Thank you for the replies....

I seem to have that the miss-conception that bigger is better when it come to the Master Cylinder.

Currently I have the 4 piston calipers from the turbo 2 model, and I have them all around.

next I have wilwood 11.75'' rotors in the front and I haven't bought the rears yet but I was planing to go the same size when I buy this second master cylinder.

another point was that I wanted to convert to manual brakes and get rid of the brake booster.

I figure that I can run the 1-1/8 in the rear to make sure the rears don't react before the front brakes do and I'll try what speed turn said and go with the 3/4'' front master cyllinder.

The bore on the caliper pistons is 1-3/8'' or 35mm

Let me know what you guys think...

Thanks again for your time

 

I found the master that caught my eye...

http://www.wilwood.com/Products/006-...RTMC/index.asp

maybe instead of a dual set up I could use this??

 

It's kind of the opposite - as small as you can given that you maintain enough travel in the claliper pistons.

Brakes are important - I would definitely do a little more research before continuing on this project.

-bill

 

Wrankin...

I never knew brakes would be this delicate.... However I will follow through, This will be quite the learning experience.

I found a site that has all the calculations for setting up brake systems, I believe in my situation I must go with a balance bar and a dual master set up.

Now I must figure what master will operate the front t2 calipers.... since I have the rear master already.

 

URL?