Brakes--Proportioning Valve

[malibu80]

If my ABS equipped car were to delete the unit...Master cylinder to splitters and to 1990 version proportioning valve...What does the ABS proportioning valve version divide rear braking?

Also, the part has two arrows on top both pointing outwards and the lower outputs have letters of undecipherable meaning maybe one kh and the other is one letter. Either way. front to rear brakes are split 50/50 and rears pass through this valve. Someone must know the regulation value! Thanks!

 

[gsxofftheline]

I'm having a hard time understanding what you are trying to say. You want to delete the ABS system? You want to take out the porportioning valve?

 

[malibu80]

Yes I took the ABS motor off my car. Now I want to reuse the old proportioning valve. I don't know what the percentage of flow gets restricted to the rear brakes and if the ABS motor had anything to do with proportioning power itself.

 

[Gstclipse69]

Yes if you deleted the abs then you need a non-abs proportioning valve.

 

[gsxofftheline]

I'm not sure about a "non-ABS" proportioning valve.

The ABS unit is the one that only brakes to prevent wheel lock up, the proportioning valve is used when high speed hard braking, it prevents the car to distribute all the weight to the front brakes causing the rear brakes to lock up. From my knowledge (just took ASE brakes test) if you were to take out the ABS unit itself, your car would brake exactly the same way with the same proportioning valve, you just wouldn't have ABS when you need it.

 

[malibu80]

thats what I had thought. I know braking is usually split equally front to rear, but at a certain point the valve restricts rear braking pressure. I just don't want to assume the ABS unit had a built in type of valve as well

 

[gsxofftheline]

Yeah it's kind of confusing when your trying to visualize how the valves are working together. If that were the case your car would have a combination valve where they are working together, but our cars don't have them. Why do you want to remove it anyway?

 

[malibu80]

I rebuilding this car for drag strip only and I dont see the point of a functioning ABS system, but I dont want to hit the brakes at the end of the track and lock up my rear brakes if you know what I mean.

 

[mario6363]

Did you ever figure out the proportioning valve rates? I have added weight to the back of my car and was hoping to allow a little more pressure to the back. I was wondering if we know of any other year cars which have different proportioning valves that allow more pressure back there. Also have you confirmed that it is 50/50 split pressure and that the proportioning valve which i call a pressure limiting valve just stops at a predetermined pressure level.