Proportion Valves for Brakes

[hauss]

Originally Posted by Morris

Snake

I would never put a Proportion Valve on the front Brake circuit......especially since 60% to 70% of braking is done on the front brakes......balancing the brakes on a road racing car is very important to the stopping as well as the handling of a car.....installing a Proportion Valve on the front circuit is automatically reducing the effectiveness of the front brakes.....and could effectively reduce the overall braking.....

A lot of guy’s crank in more rear brake bias to help the front of the chassis turn in faster....very common in all race cars....because you don’t transfer as much weight to the front when braking, thus, allowing better turn in the corner.....because there’s less push on the front tires......or less weight transferred to the front.

First you have to balance the Master Cylinders Front and Rear.....smaller Master Cylders provide more pressure but less volume.......larger Master Cylinders provide less pressure but more volume.....

For those with Single Master Cylinders...then you need the Proportion Valve in the Rear Circuit to assist in overall braking first ...then once they are balanced properly, you can start trying to add rear brake to help the front turn in better.

How do you know how the brakes are operating???

The easiest and most reliable method is to use temperature paint on the rotors....like paint a H pattern on the rotors starting at 900*degrees and then 1000*degrees, then 1100*degrees, then 1200* degrees.....on all of the rotors....then go out for some laps and use the brakes vigorously as normal.....when you come in and remove the tires & wheels.....look at the rotors and see what temperature the fronts are running and the rears are running....thus you will then know how hot the rotors are running .....

You shoot for about a 200* degree difference front to rear....like 1000* degrees on the front & 800* degrees on the rear.....in our racing on tracks we would run about 1150*-1200* degrees on front......and 900*-1000* degrees on the rears.....then if I needed to get more turnin on certain corners I’d crank in a couple turns on my brake balance bar.....none of you well reach these high numbers ...so maybe you should start with some lower numbers....and use the same ideas.....

Sorry for the long post ...but there is no short way to say all of this kind of info.....

Morris

I think they are referring to a line lock

[Ron61]

Morris,

That is a very informative post and many who really don't understand what those valves do should read it and look at the pictures.

Ron

[Morris]

Originally Posted by hauss

I think they are referring to a line lock

Line Lock is used in Drag Racing.... we are discussing Road Racing.

And I believe he said that Some in South Africa use Proportion Valves on the Front Circuit..... and that is bad as it reduces the braking on the Front where it is needed most.

Or they are not going fast enough to know the difference.

[patrickt]

Here's a pic of my dual MC bias linkage setup and, as all true race car type guys like us know, the more grease you use on anything the better it works.

[Morris]

Originally Posted by patrickt

Here's a pic of my dual MC bias linkage setup and, as all true race car type guys like us know, the more grease you use on anything the better it works.

Patrick

Have you ever been off track..... ?? cause that would be a disaster.... you might want to cover the Master Cylinders and BTW....Clean the Grease off of the Rod ends .... they just want Light weight lubricant and protection...

All of the dirt and rocks will go right to the grease...especially on the Drivers side front wheel.

Just Saying...

[patrickt]

That pic is with the aluminum box removed (it's totally enclosed otherwise). Even as stupid as I am, I wouldn't run it like that out in the open. Well, I might, but Bob P. would revoke my ERA license....

[patrickt]

This is the brake box cover that goes over it all. This pic was taken after I had a brake fluid leak inside the box. I always use the BLUE Ate Superblue fluid so it's obvious what fluid it is, which isn't always easy. They outlawed it in the US a few years ago, but I have it shipped to me from Germany. But I do appreciate you lookin' out for me, I need all the help I can get.