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In my 70 C10 I have installed a new master cylinder, new booster, new brake pads & rotors in front, new shoes, new wheel cylinders, new drums on the rear, new rubber lines from the frame to the calipers/wheel cylinders, new proportioning valve. I have bled all the air out of the lines as far as I can tell but my brake pedal is hard, barely goes down and no matter how hard I press they barely stop the truck. What can I do? Thanks
 

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Brake lines C20 vs C10 distinction?

I'm replacing bad lines and found the C10 and C20 are different.
I'm also finding the PB vs. manual are differ.

Why? trying to standardize as some adaptions may have occurred through previous owners. (i.e. the glove box label does not state PB... The truck has a PB on the fire wall).

Wanting to sustain the right thing without blowing $ in learning.

Help is most welcome.

<><
 

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We are assuming that the PB is hooked up to a manifold vacuum source....?
 
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