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Old 06-25-2013, 05:19 PM
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spongy brakes

I just completely replaced every brake related item other that the proportioning valve on my 1979 Chevy 4x4. I've bleed the brakes about 5 times, use a quart of fluid,all the air is out of the line from what I can see, and still cannot get a firm brake peddle when stopping, sitting still, the peddle is firm. Before I began this I was driving the truck without any problems at all. I've bleed brakes many time in the past without any trouble till now. Can it be that the pads and shoes need to wear in some so I don't need two feet on the peddle to stop or is there some other thing that I'm missing. Any suggestions would be great.. Brake-less.

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Old 06-25-2013, 06:11 PM
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Are the rears drums? If so make sure they are adjusted properly. That will make the brakes seem soft.
Also, take a look at the calipers. Are the bleeders facing up on both?
Did you hold the pin out on the prop valve while you were bleeding? That is a good place for air to get trapped.
How about the master cylinder? Have someone pump the brakes, hold, and then crack the lines at the m/c. Sometimes air likes to stay trapped there too.
Have someone pump the brakes to check for a brake hose that is ballooning under pressure. Increased pressure with new components will sometimes break an already partially compromised part.
If the brakes feel soft with the engine running, pinch the rear brake line before the distribution block, and see if the pedal gets better. If it does, and the drums are adjusted properly, and the wheel cylinders are not leaking and the hardware is installed correctly, it could be in the rubber line.
If no change, pinch off the left caliper line, then the right line. You see where I am going with this?
If all good, then it could be air trapped in the master or prop valve.
Good luck.
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Old 06-25-2013, 08:14 PM
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spongy brakes

The back has drums, about 2 years old and in good condition.Adjustment is good. Front calipers are new, bleeder valves up. The pin on the prop valve is something I didn't do, didn't know about. Master cylinder was bleed prior to brakes. No ballooning of brake hoses. Firm peddle with engine running. I'll try your other suggestions. Thanks for the input..
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