How come all my manual drum cars have disc master cylinders?
Hey guys:
I am currently working on a 1968 Valiant with 9" manual drum brakes front and rear. I total went through them. 3 new soft lines, 1 hard line, wheel cylinders and all shoes. I initially wasn't going to replace the master cylinder until one of my Youtube viewers pointed out that it had a disc brake master cylinder.
So, I got on Rock Auto and ordered a new Raybestos(now made in China) MC. I actually ordered two, because the guides say that the same MC interchanges on several other pre-71 Mopars, including a 1967 Chrysler 300 with power drum brakes. I have a '66 but it has already been upgraded with a factory dual-circuit system.
My problem is that I cannot get fluid to the rear. Crack the line at the MC and it's dry. The fronts bled, and I got a very hard pedal with about 1 to 1-1/2" of PISTON TRAVEL before I get resistance. The new master has either a 1" or 1-1/32" bore( I already installed it but I took the time and effort to go out and crawl under the dash to measure it.
So, any ideas what's happening here? I think the idea that one master crosses over from a manual drum with 9" brakes to a power drum car with large brakes sounds suspect, but you guys know more about these than I do. I realized way into this job that the brakes changed somewhere around '71 or '72 because everything from my '73 parts car is different...hubs, MC, and hardware.
Pictured is the Raybestos MC36221 MC I received as spec'd for a 1968 Valiant 9 and 9 manual.
Hey guys:
I am currently working on a 1968 Valiant with 9" manual drum brakes front and rear. I total went through them. 3 new soft lines, 1 hard line, wheel cylinders and all shoes. I initially wasn't going to replace the master cylinder until one of my Youtube viewers pointed out that it had a disc brake master cylinder.
So, I got on Rock Auto and ordered a new Raybestos(now made in China) MC. I actually ordered two, because the guides say that the same MC interchanges on several other pre-71 Mopars, including a 1967 Chrysler 300 with power drum brakes. I have a '66 but it has already been upgraded with a factory dual-circuit system.
My problem is that I cannot get fluid to the rear. Crack the line at the MC and it's dry. The fronts bled, and I got a very hard pedal with about 1 to 1-1/2" of PISTON TRAVEL before I get resistance. The new master has either a 1" or 1-1/32" bore( I already installed it but I took the time and effort to go out and crawl under the dash to measure it.
So, any ideas what's happening here? I think the idea that one master crosses over from a manual drum with 9" brakes to a power drum car with large brakes sounds suspect, but you guys know more about these than I do. I realized way into this job that the brakes changed somewhere around '71 or '72 because everything from my '73 parts car is different...hubs, MC, and hardware.
Pictured is the Raybestos MC36221 MC I received as spec'd for a 1968 Valiant 9 and 9 manual.