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Old 02-24-2013, 03:55 PM
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Trouble bleeding brakes.

Let me first say I've done many of complete brake jobs in my life including masters.
I've never had trouble bleeding brakes ever before. I used to wonder why so many people had trouble on all the car forums I belong to.

Well, I'm having trouble.

1983 El Camino with power brakes. Front Disc and Rear Drum

Just did a complete brake job.
New front calipers, rear cylinders, master cylinder, all 3 hoses and of course pads and shoes. Rotors and Drums were both turned.

I bench bled the new master using instructions that said "New and Improved Procdure"
You just put plugs in the 2 ports and keep manually pumping with a dowel until no more bubbles appear in the reservoir.
That was a new one on me. In the past they always came with tubes that you clip onto the rim of the master and pump the fluid all the way through.
Anyway, I did it the new way and it worked the way they described.

After getting it back on the car, I was able to bleed the brakes normally. I got my wife to pump the brakes for me. I went all the way around 3 times.

I thought I got all the air out. It acted like it. All the brakes were working with the car up in the air.

Test drove and have a mushy pedal. It will stop the car, but they don't feel good at all and the car didn't stop without pushing pretty darn hard. It feels like the pedal is going all the way down when I do that.

I put the car back up in the air and used my vacuum bleeder. RR, LR, RF and LR. Pulled about 3 oz of fluid out of each one.

Still got the mushy pedal that feels like it goes all the way down.

Should I re-bleed the master or do I just have stubborn air trapped somewhere else?

Oh, I didn't change the proportioning valve. It's original and 30 years old. Should I replace that?
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