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Old 08-30-2006, 03:19 PM
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Combination Valve advice required

I have mounted the brake master cylinder under the floor and due to space i was thinking to position the combination valve somewhere above it . would this cause a problem with fluid draining back into the master cylinder , i will be using residual valves from the front and back but i am not sure if these will prevent fluid draining from the combination valve, (hope that make sense ) any feedback appreciated, cheers
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Old 08-30-2006, 04:35 PM
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Are you plumbing DISC/DRUM or DISC/DISC?
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Old 08-30-2006, 04:46 PM
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I`ll be using disc/drum setup
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Old 08-30-2006, 08:49 PM
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Quote:
DISC/DRUM UNDER FLOOR WITH COMBINATION VALVE



DISC/DRUM UNDER FLOOR WITH ADJUSTABLE PROP VALVE



Residual Pressure Valves are used in a both front and rear brake system as follows:

2 PSI Valves - These valves are used in a disc brake system only and are required when the master cylinder is at, or below, the height of the calipers. It's purpose is to act as an anti-siphon valve preventing the brake fluid from siphoning back into the master cylinder when the brake pedal is released. Even if the master cylinder is even or slightly above the calipers, put one in anyway. If you don't and you park on a hill, fluid will siphon! These valves are cheap insurance - put them in! NOTE: You will know if you need one of these valves if you had to pump the pedal twice to get a good pedal. See illustration for more.

10 PSI Valves - These valves are used in a drum brake system to prevent air from being ingested into the hydraulic system when you release the brake pedal. Typical wheel cylinder seals only seal when there is pressure behind them. Rapid release of the brake pedal creates a vacuum in the system which causes the seals to relax and air is ingested into the wheel cylinders. Maintaining 10 PSI in the system at all times prevents this. Some disc/drum master cylinders have 10 PSI residual pressure valves installed internally, some don't. If you are not sure whether you have one or not, put one in. They are not cumulative and it won't hurt anything if you have two. Don't worry about brake drag, it takes roughly 75 PSI to overcome the return springs.
The above explains the theory of a master cylinder positioned below the front brake calipers. If you position the combination valve (three-way valve) above the M/C and calipers, I would think you would need an additional 2 PSI valve between proportioning valve and the M/C outlet in addition to the one between the calipers/combination valve to keep the combination valve from draining itself into the master cylinder.

Usually, the 10 PSI valve is included in either (or possibly both) the disc/drum M/C (drum outlet) and drum outlet of the combination valve.

-Source of Tech Material-
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Old 08-31-2006, 04:27 PM
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Thanks for the info KULTULZ
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Old 08-31-2006, 06:16 PM
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You are quite welcome Sir...Hope it helps...
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