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Old 12-30-2006, 08:31 PM
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gm 14 bolt disc brake question

I'm going to be installing rear disc brakes on my 14 bolt rear axle in my chevy 4x4. Does anyone know If I need to install a different or second proportioning valve for the rear brakes? I have heard that if you don't when you step on the brakes the rear will lock up.I have also heard you can crimp the rear brake line, but this sounds like a cobble job way to go.I have talked to guys that have done this swap and they don't have any issues but these are on trail only rigs, mine will be mostly street driven.

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Old 12-30-2006, 08:47 PM
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I can't speak specifically for the 14-bolt, but discs require more psi to get the same brake torque compared to drums. On a typical vehicle you want about 70/30 f/r braking power (of course depending on weight distribution and many other factors). In order to get that (again depending on the individual system), you have to send up to 90% of the pressure to the front and only 10% to the rear.

So, in most cases, yes. If you are going to rear discs you have to change the bias of pressure you give them. Wilwood, Summit, Baer, and other brake companies make an adjustable prop valve which is a nice little thing. In your situation since you are duplicating a factory setup, you could use a prop valve from truck. But, since the aftermarket ones are only like $40, it would allow you to fine tune it. Since front and rear have different discs and calipers there is no real accurate way to predict how much pressure you have to send to each to get the proper braking bias. The adjustable valve is so nice because you just dial it in.
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Old 01-03-2007, 05:16 AM
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Drum brakes require a non return valve to keep fluid up to the wheel cylinders, discs don't. These are usually found inside the m/cyl line fittings and easily removed.
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