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Hello,
I'm new to posting, but have been using this forum as my bible when it comes to questions. Thank you for all of the informative posts that have saved me countless hours!
Anyway, onto my problem-
69 Camaro Conv project that I bought off someone who didn't have time to finish. He bought the CPP 4 wheel disc conversion system. The rear calipers are from an early 90's Caddy Seville.
The front brakes are bled and all set.
The rears were very difficult to bleed - not much fluid or pressure. We finally got them flowing really good and were bled. The problem is after they're bled, the rear brakes remain locked and are held strong enough preventing the car from moving.
I called CPP and they suggested the rod at the booster may be too long and to disconnect the MC and see if that releases pressure. It did not and we're still locked up.
We took one caliper off and cycled it to make sure they weren't seizing.
The only way we've been able to get the caliper to release after bleeding is to undo the bleeder screw and release the pressure.

I think we've narrowed it down to a MC issue or one of proportioning valves. Has anyone else had this happen? Any suggestions? We've got far more time into bleeding brakes than I could ever have imagined.

Thanks in advance!
 

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If I recall correctly with those rear calipers it is necessary to adjust the E-brake before you bleed the brakes.

On front disc rear drum cars there is a residual valve that keeps presure to the rear drums when the pedal is released. I would look at the front to rear brake line for the valve.
 

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If I recall correctly with those rear calipers it is necessary to adjust the E-brake before you bleed the brakes.

On front disc rear drum cars there is a residual valve that keeps presure to the rear drums when the pedal is released. I would look at the front to rear brake line for the valve.

I'm in the middle of this swap as well. In my infinite wisdom, knowing I needed to do the e brake first, I didn't. Now when I bleed the brakes, upon opening the bleeder on the rear caliper, the pedal does not go to the floor as I expect it to. It only drops about half an inch.

I am also getting a weird clicking sound when we let off the pedal. Sounds/feels like it is coming from the booster. I get a decent pedal with the car off. Not so much with it running. I have the rod adjusted pretty close to the end. No air coming through the bleeder, even though the pedal is not dropping more than an inch.
 
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