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The master cylinder volume is to displace the area of the of the pistons or wheel cylinders.A proportioning valve controls the pressure.A stock valve and a race valve do the same thing they open and close the passing orfice which controls the pressure,ie: putting your finger on a garden hose to increase the pressure.Small race calipers with small pucks can use a small MC(less area,less volume)large street calipers with large or multiple pucks need larger MC bores and resovires. By adjusting the size of the passing orfice(making it smaller) increases the pressure,usually in to increase and out to decrease on the race valves

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The master cylinder volume is to displace the area of the of the pistons or wheel cylinders.A proportioning valve controls the pressure.A stock valve and a race valve do the same thing they open and close the passing orfice which controls the pressure,ie: putting your finger on a garden hose to increase the pressure.Small race calipers with small pucks can use a small MC(less area,less volume)large street calipers with large or multiple pucks need larger MC bores and resovires. By adjusting the size of the passing orfice(making it smaller) increases the pressure,usually in to increase and out to decrease on the race valves

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So you sre saying that a propvalve is nothing more than a finger on the hose.
Dont get me wrong here i want to learn this but wouldnt the finger keep the caliper pistons from returning and drag the rotors?
Or is it a spring actuated valve of somekind?

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It is like putting your finger over the hose BUT
with the brakes its going into a closed area(line
and caliper) SO the pressure will equalize on both
sides of the valve after a giving period of time.
All that valve is is a delay on the pressure... in
hyd, the pressure will equalize

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So without a prop valve you will have the same pressure at all 4 corners? the same stopping power at all 4 corners?

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Yes if the pistons in the master are the same, the
only difference would be the size of the caliper
pistons or wheel cylinder sizes... but if the master
pistons are the same you have the same PRESSURE

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Not necessarily the same stoping power. I have the same calipers at all 4 wheels but my front rotors are 10-1/2" and the rear rotors are 12+" so the rear will have more stopping power. Gee maybe that is why I don't have the need for a porportioning valve since I run big&little tires...........

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Very true, the farther you get from the centerline
the easier it is to stop the same mass

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With that being said would it be harder to do a burnout without a prop valve?

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With that being said would it be harder to do a burnout without a prop valve?

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You just have to hold the brake pedal a little longer
for the pressure to get to the fronts(remember it
will equalize)... most people including myself pump
the pedal a few times and hold it then press the line lock

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With that being said would it be harder to do a burnout without a prop valve?

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You just have to hold the brake pedal a little longer
for the pressure to get to the fronts(remember it
will equalize

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huh

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With that being said would it be harder to do a burnout without a prop valve?

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You just have to hold the brake pedal a little longer
for the pressure to get to the fronts(remember it
will equalize

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huh

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Tony.... if you have a prop valve in the fronts the
pressure will be SLOW getting past the prop, then
it will equalize after X period of time

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The master cylinder volume is to displace the area of the of the pistons or wheel cylinders.A proportioning valve controls the pressure.A stock valve and a race valve do the same thing they open and close the passing orfice which controls the pressure,ie: putting your finger on a garden hose to increase the pressure.Small race calipers with small pucks can use a small MC(less area,less volume)large street calipers with large or multiple pucks need larger MC bores and resovires. By adjusting the size of the passing orfice(making it smaller) increases the pressure,usually in to increase and out to decrease on the race valves

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So you sre saying that a propvalve is nothing more than a finger on the hose.
Dont get me wrong here i want to learn this but wouldnt the finger keep the caliper pistons from returning and drag the rotors?
Or is it a spring actuated valve of somekind?

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Your not comprehending this at all,the pressure is only when the piston is depressed in the master cylinder which inturn pushes the fluid through the system pushing the pucks and applying the brakes,when the pedal is released so is the pressure,simply theory of hydraulics pressure applied through the pedal ratio,applied through mc bore/stroke,controlling a given volume at a given pressure.Change in pressure can be regulated by the size of orfice it passes through.The small orfice holds back the volume(under pressure) and the orfice creates the additional pressure.ie: a nozzle on a fire hose or pressure washer.Sorry I can't explain it any simpler,hope it helps you understand.Another example would be a diesal fuel injection system where as a pump generally pumps fuel at 45psi to the injector nozzle the nozzle orfice releases fuel at 1800psi.