Doing a brake conversion from drum to power drum on my '66 Chevelle (283 CID). The 9" booster and M.C. are installed but there is not much pressure coming from the M.C. when I'm attempting to bleed the brakes. Am I doing something wrong? The M.C. is brand new and it might be bad...but what are the chances?? I'm open for anything at this point. I tried to let it gravity feed for a while..but not much luck. I did a bench bleed on the M.C. but I can not figure this out. Thank you.

I forgot to mention that the M.C. cylinder is a dual port and can have lines on either side. I have mine plumbed on the driver side. Is there another application I can use or buy...no one seems to be able to help me. I'll need a dual M.C. and preferrably like to keep the lines on the driver side. Thanks again.

I'm by no means an expert but this seemed to help with my issue when I had it, different rod length from booster to push the master cylinder piston in?

Thank you...the shorter rod seated all of the way but I'll look at it again. I think the longer rod will partially engage the brakes. Thank you.

Front or rear or both? Are the rubber brake lines new or old. They will collapse inside and stop or reduce the fluid flow and pressure.

This is happening at all four wheels and I replaced the rubber lines...I just can't seem to figure it out, unles the M.C. is bad. I'm really confused. Thank guys.

Did you bench bleed the mc? I didn't when I switched over to PB. I had to take it off and bench bleed it before I had any pedal pressure.