Does anyone have interest in these? I had some made for my rally car project. They are a bypass fitting allowing for the stock prop valves to be removed from your master cylinder. Would allow for use of stock master cylinders, but addition of user controllable proportioning valves. Outlet fitting is 1/8" FIP. Shown pictured with the 1/8" pipe x -3 adapter I will use for my brake lines.
Will cost around $50 each. Less if there is much interest.

 

Unless you are ripping out the ABS, why would you need this?

 

Pretty much for racing braking bias control. We use it in CMC.

 

Correct, I designed it for use in our Stage Rally car. With this we will have a hydraulic hand brake for the rear axle, and a driver adjustable bias control valve.

 

Do they make a twin circuit in cabin adjusting valve? I want an in car adjustment and to keep diagonal circuit.

And maybe a hand brake later on.

Ps Thompson race fab correct?

 

(Yes, TRF= Thompson Racing Fabrication)
I have never seen a twin circuit adjuster, that doesn't mean there not available, it just means I've never seen it. I suspect something like this may be available for Group N guys overseas. If it is, it's likely exceedingly expensive like everything Group N. I have seen twin chamber hand brakes, and they are big big $$$. But then Group N cars often exceed $100,000 USD value, so spending $1,000.00 on a handbrake isn't such a big expense. For comparison, the single valve one I sell, and use in my own cars, is $160.00.

I am curious why you want to keep a diagonal circuit, but add handbrakes, and bias control. In my experience, which is mainly in Rally, two things we stay as far away from as possible is unnecessary complexity, and unnecessary cost. Seems to me, keeping the diagonal braking in a competition car would fit both. It would be somewhat necessary if you were keeping your ABS, but that doesn't make sense, because then we wouldn't be talking about a proportioning valve eliminator anyhow, as the ABS effectively does most of your bias control.

Ryan

 

Then I am missing the point of these fittings that is all. I thought you made these in order to get user adjustable bias. I run no servo and no abs currently. I would just like to be able to adjust the rear brake. What do you use if you use these proportion valve deletes ? I was saying twin circuit so that the rear brakes were adjusted simultaneously. Is that not how you do it ?

Please advise!

 

http://www.apracing.com/product_deta...-cp4550-1.aspx

You would have to use something like this with your firings right ?

Or do you block one rear port off?

 

Correct, that valve from AP would work. Because mitsubishi uses a diagonal braking system and dual chamber master, you can not simply cap a line, it would create un-balanced braking. However, to simplify, unless you need to retain separate rear channels, you can combine the rear lines. You will be re-plumbing anyhow. There will be pictures of my set up soon in my rally car build thread. In short, you "T" the rear brake lines together shortly after the bypass fittings above. Then run the now single line through a bias control valve. Continuing to the rear of the car where it will again "T" to each rear caliper. You will now have full control of rear brake bias. That IS the intent of why I built this part.
I will be using this valve, a fraction of the cost of the Group N type valve: http://www.wilwood.com/MasterCylinde...temno=260-8419

There are many manufacturers of similar valves, all with varying features, and varying costs. You could pick whatever valve works for you.

Does that help clear any of it up?

Ryan

 

Like crystal !