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Old 04-11-2007, 11:05 AM
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Proportioning valve

I just bought a '68 Impala Wagon which has a front disc brake conversion. The pedal seems to take pretty good effort eventhough power. Would this be a result of not installing a proportioning valve when the conversion was done. It seems like the old distribution block was used. Any suggestions what I should look at or do to correct the problem

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Old 04-13-2007, 05:45 PM
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Brakes

Did they put a vacuum booster on it?
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Old 04-13-2007, 05:51 PM
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Car had power brakes. Same booster was used
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Old 04-13-2007, 06:22 PM
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If they used the drum brake safety block instead of a true proportioning valve, the the rears will be doing most of the braking. The front discs need way more pressure than drum rears.

I'm not up on chevy cars but I am with chevy trucks. On those years chevy trucks, a disc brake valve is bigger & has more removable parts than one that is drum-only.
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Old 04-13-2007, 06:24 PM
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....and in normal stop & go city driving, the front rotors should be real hot compared to the rears.

Test it with some aggressive stops to see if the fronts get super hot...they should.
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Old 04-13-2007, 06:50 PM
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If it takes alot of pedal effort the master cylinder may be too large or the booster may not be working. The pedal ratio may be too steep also. A proportioning valve won't make any difference in pedal effort. Nor will a proportioning valve show any noticable difference in normal brake operation.

What calipers did you put on the front, what size is the booster and does it work?

The test is to press on the brakes several times with the motor off to bleed out any vacuum from the booster,, then depress the brake pedal and hold moderate steady pressure on it, start the motor. If the pedal starts to drop away under your foot as the motor starts, the booster is ok. If the effort you put on the pedal stay the same, the booster is probably no good.

If it only has the old distribution valve it needs a metering valve installed somewhere in the front line. This allows the rears to start to work slightly before the fronts do, ( don't confuse this with stopping power, it is more of a timing control).

Check this facts page found on the ECI website.
It tells about metering valves.

http://ecihotrodbrakes.com/brake_facts.html

Here is a good page that Masterpower brakes has set up with a bunch of tech info that may help you determine where your problem may be.
http://www.mpbrakes.com/technical-support/overview.cfm

Hope this helps, mikey
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Old 04-14-2007, 08:39 PM
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Thanks for the info. Will check the sites
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