Thread: Proportioning Valve? Dual inlet/outlet vs Single inlet/outlet

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Dago Red,

The proportioning valve was necessary in the disc/drum set up to compensate for the delay of the rear drum brakes. Since there is no delay in the rear disc set up only a block is needed to separate the front and rear systems (with a dual line MC) and activate a warning light in the event of failure, if you want a warning light. Which is simple to wire.

An adjustable proportioning valve in the rear line can be used to set front to rear reaction time if you find it necessary to tweak the braking of the car. Under braking, most vehicles transfer more weight to the front wheels. When this happens, the rear wheels lose some weight and can lock up if the pressure is too great too quickly in the braking.
Eventually full pressure is applied to the rear brakes through the proportioning valve, if it's a factory or a aftermarket or a adjustable.

Are you using a dual line master cylinder? You should, in case one end brakes a line, or pops a wheel cylinder, or any leak, you'll still have brakes at the other end, hopefully the front!

If you want to stop better/quicker, add power asst, or larger front disc setup.

Pat