|12-21-2005 03:46 PM|
|yesgo||That is the way it is supposed to work.|
|12-21-2005 03:42 PM|
|47convert||So, if your rear brakes are locking up you would back the valve off?|
|12-21-2005 03:36 PM|
I guess it is possible to increase the spring pressure by loosening the knob, but it seems overly complicated. I am not aware of any pressure sensative prop valves like that. Adjustable and non adjustables I know of are offshoots or knock offs of a Kelsey-Hayes design put in production in the mid sixties.
The spring has to put pressure on the piston. Increased spring pressure increases the knee point=increased line pressure.
There is a brass valve being sold as a proportioning valve which works the other way. You can find it at some hot rod vendors. It looks cool, but isn't really a brake proportioning valve. It's more like a faucet. It increases or decreases flow at all times. Not designed or recommended for brakes.
|12-21-2005 02:36 PM|
"Turning the knob clockwise (in) increases rear brake pressure" is the correct answer. I went through this exercise on my car when I first got it on the road. I thought if you unscrewed (counterclockwise) the knob that it would let more pressure to the rear wheels but I was wrong. It's a complicated explanation about the internal springs (see yesgo) but he is correct. Contrary to what seems logical, you do screw it in (clockwise) to let more pressure to the rear brakes.
|12-21-2005 02:20 PM|
|12-21-2005 01:37 PM|
|yesgo||Yeah, I guess if it had left handed threads it would work the other way.|
|12-21-2005 01:22 PM|
|machinestheman||it depends on how the valve was designed i doubt it highly that different manufacturers make the exact same part|
|09-15-2005 07:36 PM|
If you turn the knob out fluid is cut down. Sounds like your friend was right.
|09-15-2005 08:08 AM|
Thanks for the info - Glad I was right.
|09-14-2005 09:03 PM|
Clockwise puts more pressure on the spring. More pressure on the spring means it takes a higher psi to push the spring. The spring is pushed by fluid pressure. Therefore more pressure on the spring means a higher fluid pressure is needed to move it, resulting in more/longer action in the rear brakes before pressure is reduced. Full master cylinder pressure is allowed to the rear brakes until the piston, held by the spring, moves.
The adjustable valve has arrows on the knob. Clockwise=Increase.
Putting it in backwards would effect operation, but I dont think it would operate correctly or opposite.
|09-14-2005 05:25 PM|
That *is* how it works on mine, it'd probably work
the other way if you install it bass ackward...
|09-14-2005 04:55 PM|
I am having a friendly(HaHa) discussion with my buddy about after market proportioning valves and since we don't have one handy to prove one of us wrong I thought you guys could set one of us straight.
I contend that if you turn the valve in(clockwise)that the fluid to the back brakes would be cut down. Am I right or wrong?
Thanks a lot for the help.