[Greg Reid]

Originally Posted by Scarebird

Correct. Mid-70's GM did a flip-flop on the reservoirs for simpler valving.

Some masters are still being made for the older style but more expensive and less effective.

Drum/drum work fine too but watch the fluid level.

How do you recognize that by looking and if I used the pictured master, front reservoir is for the rear and visa versa?

[Scarebird]

Originally Posted by Greg Reid

How do you recognize that by looking and if I used the pictured master, front reservoir is for the rear and visa versa?

Bigger rez is for fronts.

[Murf]

Originally Posted by Scarebird

Bigger rez is for fronts.

I’ve got a couple more basic questions if you have time.

1. What exactly is the difference between disc / disc vs disc / drum master cylinders?

2. Is there any correlation between the fitting sizes on the master cylinder and where they go? I.E. does the bigger fitting always go to the rears, which usually have a larger line?

Thanks,
Murf