egr brakes for 1st gen
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A proportioning valve is needed on any vehicle. When you stomp on the brake pedal weight transfers to the front makes the rear lighter and easier to lock up. Which is likely to cause the vehicle to spin. Our trucks should already have one and if you do this conversion youll have to switch it out, good news is they make universal ones that are adjustable with a ****. Just takes a little time playing engineer in the garage.
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By the way, the proportioning valve is only there if your ABS fails. If yours works (mine doesnt) you really dont need one.
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By the way, the proportioning valve is only there if your ABS fails. If yours works (mine doesnt) you really dont need one.
Last edited by kieron_kohlmann; 10-16-2010 at 10:38 AM. Reason: Automerged Doublepost
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that is actually not true. alot of cars do not use them especially now a days. chevy trucks do not use them. instead they use dual feed master cylinders where the master cylinder controls how much fluid goes to the front and rear without the use of a proportionin valve. alot of ford vehicles do that too. and especially anything with a true 4 wheel abs setup from the mid 90's on will not use one either. they use the hydraulic abs module to control how much fluid moved to each wheel
#9
All vehicles have some sort of proportioning valve. Wether it be a regular proportioning valve,height sensing, adjustable, combination valve, or an electronic one such as a Delphi DBC-7 which is built into the ABS module and performs the same function as a regular valve. The Tandem Master cylinder has been required by SAE since 1967. Maybe your confusing it with a quick take up master cylinder which almost obsolete now. I can't find the master cylinder your referring to, even in my new college text book for automotive Engineering-brake systems. Im interested in how it works though if you could show me!
#10
I know mine works in that fashion as when I jab the brakes FIRMLY on wet pavement, and back off a little, I can feel a pulsing in the brake pedal as well as feel the rear of the truck shudder (in sync with the pedal). It's a diminishing series of pulses.
It doesn't work with a full on panic, gonna run over a child application of the brakes. It's geared toward the more common inadvertent locking of the wheels. Further, it's capacity in how long it can carry on as such is limited to the size of the accumulator (and the master cylinder's stroke perhaps). It's to help reduce the chance of loss of control.
Bobby, I guess to better answer your question, if the brakes system you're using can't slow the wheels fast enough, the tone ring on the rear end won't slow rapidly enough to have the controller recognize the event as being a loss of traction. Further, if you don't back off quickly (as in a jab application. Still locked, you're just not standing on the pedal), it won't activate. Make sense?
DON'T quote me on the actual/correct function. The above is just my interpretation. And as folks might tell ya, I'm crazy.
Last edited by BC847; 10-17-2010 at 09:09 PM.