First things first. I have a 1949 GMC 3/4 ton with all new brakes lines, wheel cylinders and brakes are adjusted up properly. It has the OEM 1/4 inch steel lines and Huck Brakes.
Recently the old single chamber master cylinder started leaking so decided it was time to move to a dual chamber MC. Ordered the conversion mounting kit and picked up a remanufactured Fenco M-1505 master cylinder (fits 67 Nova) and shows as master cylinder for all drum brakes. Put extra new lines to existing brake lines using the proper couplers. Eliminated the junction blocks that were on the OEM brake lines. The first Fenco M1505 master cylinder leaked out of the front, so bench bled and installed the second one. The problem is that bleeding has been a real pain. It seems that the master cylinder does not put out much volume and this has really made it hard to get any braking capacity. My friend helping me bleed the brakes commented on how long it was taking also. Surely I do not have another bad master cylinder, but looking for ideas. The Fenco M1505 has a 1 inch bore so do not think that volume should be an issue.
Wondering if I should go with a different master cylinder. If so, part numbers would be great.
Any ideas would be appreciated.
