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Old 04-21-2005, 10:04 PM   #1
rocky2
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another dumb question

I am getting ready to hook up the brakes on the burb. I converted to disk brakes and I have the master as well as the proportioning valve from a 71. There are two outlets on the valve one comes out the back, and one out the bottom. my question is which is front and which is rear brakes?
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Old 04-21-2005, 11:10 PM   #2
RicksTrucks
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I think the back may be for the front. Maybe someone else can confirm. If you search I know there was a thread earlier about this.
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Old 04-22-2005, 12:39 PM   #3
BigDaddyBardo
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The large port is for the Disc Brakes, the small port for the rear wheel cylinders.
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Old 04-22-2005, 01:32 PM   #4
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I always thought the proportional was to reduce the amount going to disc since they didn't need as much pressure.
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Old 04-22-2005, 01:45 PM   #5
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This is 1/2 ton setup. front to disc rear to drums. 3/4 tons are different. John
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Old 04-23-2005, 08:11 AM   #6
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If you remember your physics classes back in hi school or college you'll recall Pascal's law which states P=F/A where P is pressure, F is force and A is cross-sectional area the force acts on. A = the volume of fluid. Disc brakes (calipers) have a larger volume than the volume of the rear wheel cylinders, hence the larger brake line. I hope this helps.
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