Brake system question

2rods · January 09, 2007, 06:00:26 PM

My son is building a mustang race car with manual brakes. Wants to install an adjustable porportioning valve in rear brakes as well as line lock on the rear. Our question is can we eliminate the stock porportioning/ differential valve? We will be using a dual master designed for this swap. I think we can just tee the front brakes to the rear port of master and have the front port of master to rear brakes with line loc and adjustable valve in the line. Correct me please if this won't work. Also the line lock should go after the adjustable porportioning valve? Thanks guys.

enjenjo · January 09, 2007, 06:14:38 PM

Yes it will work. And the line loc goes between the brakes and the proportioning valve. If I may ask, why a lone loc on the rear?

2rods · January 09, 2007, 07:52:20 PM

Most racers do it this way especially with auto. Just press button and brake and do a burn out. No creep. The other way pump brakes a few times hold down apply loc burn out and very possible to creep if leakage occurs. I guess it's what you prefer. As to porportioning valve before or after line loc on rear shouldn't really matter should it? If installed on front brakes then I can see why it has to go after porportioning valve especially if using a differential valve.

dragrcr50 · January 09, 2007, 08:54:05 PM

Quote from: "2rods"Most racers do it this way especially with auto. Just press button and brake and do a burn out. No creep. The other way pump brakes a few times hold down apply loc burn out and very possible to creep if leakage occurs. I guess it's what you prefer. As to porportioning valve before or after line loc on rear shouldn't really matter should it? If installed on front brakes then I can see why it has to go after porportioning valve especially if using a differential valve.

For what its worth the line loc goes on the front brakes so the rears are free to do a burnout. otherwise it will kill the shoes and drums in no time or discs which ever you have.. put it near the m/c to the frt brakes and a button to activate on shifter or floor etc.. good luck ...

2rods · January 09, 2007, 10:34:24 PM

By putting it on the rears you block the fluid going there so the brakes DO NOT apply there fore not burning up the rears. On a mustang the rears don't wear out anyways.

phat rat · January 09, 2007, 11:38:10 PM

sure never heard of line loc on the rear. I understand the Mustang not wearing them out. Need enough omph to turn them in order for that to happen.

dragrcr50 · January 09, 2007, 11:43:47 PM

Quote from: "2rods"By putting it on the rears you block the fluid going there so the brakes DO NOT apply there fore not burning up the rears. On a mustang the rears don't wear out anyways.

I must say that should work alright?.. I have been using them since they were invented i think and never heard of one on the rear, must be gettin old... but i see how it can work by blocking it before master cyl is activated... good luck .Im still putting mine on the fronts next week haha

enjenjo · January 10, 2007, 12:55:17 AM

Same here, I have never installed one on the rear, but I see no reason it won't work that way.

2rods · January 10, 2007, 01:19:35 AM

http://go.mrgasket.com/pdf/RollControl[1].pdf

enjenjo · January 10, 2007, 01:27:19 AM

It says in the instructions to install on the front for racing.

Charlie Chops 1940 · January 10, 2007, 04:53:00 PM

A line lock locks the wheel cylinders/rotors of the axle for which you install the device. It does not prevent the flow of fluid for the axle for which you do not want the brakes to apply.

I'm sorry, but you have it backwards. If you just want to do the occasional burnout just hold your foot on the brake and give it the gas....It'll spin the tires - unless you haven't got any ponies.

Charlie

2rods · January 10, 2007, 05:08:01 PM

It will work work both ways. On the rear is the way most real racers use now. This wasn't my original question anyways. Thanks.

purplepickup · January 10, 2007, 05:45:17 PM

I think your original question was whether or not you can replace the stock proportioning valve with an adjustable one and install it and a line lock on the back brake line. You can if you want to. All the proportioning valve does is allows you to adjust the line pressure so that the front brakes lock up just before the rear do.

You may not need a proportioning valve but if you do you should install it so that you can adjust the most aggressive brakes (usually the front).

To see if you need one you hit the brakes hard on a dirt road and see if the front or back is locking up first. Many cars are ok without one.

tomslik · January 10, 2007, 07:45:37 PM

well, you can put the lineloc anywhere you want BUT if you think it will keep pressure from being applied,think again.personal experience...i set mine in a 66 chevelle and then hit the brakes again.
amazing how much pressure it'll make.
bent the backing plate on one side and spit the wheel cyl out (4 wheel drums), couple that with a single m/c and you got problems...
i got another story about linelocs but....well, it was operator error....

i wonder if "most racers" are FWD....then it'd make sense...

phat rat · January 10, 2007, 07:51:17 PM

i wonder if "most racers" are FWD....then it'd make sense...

Somehow I don't think "real racers" are FWD. But it does make sense that that would be a reason for using line-loc on the rear