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Old 04-18-2008, 06:52 PM
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Master Cylinder Problem?

I attempted to bleed the brakes in the Nova today, but problems arose immediately. There was no fluid going to the rear brakes. I even took the line off the master cylinder to see if fluid was moving to the distribution block. Not even a drip coming out of the M/C for the rears. Front is OK. Thanks in advance for any advice on this.

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Old 04-18-2008, 07:21 PM
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Did you replace the master, if so did you bench bleed it. Sometimes just opening the bleeders and letting it sit for an hour or so will start a gravity bleed, you need to keep an eye on it as you dont want it to run dry

Chet
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Old 04-18-2008, 10:36 PM
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The safety valve on the proportioning valve could be the problem. GM service manuals show the simple tool used to keep the safety valve pin pushed "in" during bleeding. It is something you can make.

Look on your proportioning valve; There should be a black rubber boot on one end of the valve. This boot covers a "pin". That pin needs to be held "in" during bleeding. Then the valve will flow fluid to the rears. This is a common problem on some I have dealt with on similar year GM pickups.
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Old 04-19-2008, 01:36 AM
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I don't know what kind of MC you have, but make sure the pushrod is not adjusted too tight and covering the transfer port with the cup seal on the piston. Make sure the transfer port is not clogged.



It can happen with either manual or power brakes.

When you first depress the brake pedal you should be able to see the brake fluid in the reservoir move a bit from the initial movement of the piston pushing fluid back into the reservoir through the transfer port. (that is the little geyser you see sometimes when you push the pedal fast while you have the cover off..)

Later, mikey
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