The clutch/brake master cylinder for my A coupe came in the mail today. Its a Raybestos PN MC34404 for a '61-'62 Chevy truck. First thing I noticed is that the outlet ports are marked "clutch" & "brake". Second thing I noticed is that their orientation would put my brake pedal to the far left and my clutch pedal in the middle, between the brake and gas pedals. Im wondering if I can just ignore the markings and swap ports? The piston bores are both 1 1/8"dia. and the outlets are both the same size. The only difference I can see is that there is a short dam/divider in the bottom of the reservoir that is positioned closer to the "clutch" side. See pictures... Are there any other differences that I may be overlooking? Im thinking that there may be a residual check valve in the brake side...If so, Ill just have to figure out how to remove or disable it. Any thoughts?
The other way to solve this problem, is to build or use a GM clutch/brake ***embly,it will put the peddles in the right place. I ran the same setup in a '49 Jeep, panel delivery and it worked just fine. ...................Jack
Interesting...I just thought they screwed up on their new castings, I never knew the stock pedal setup was crossed. Good info for a later project. For the A, Im using an Ansen style swing pedal ***embly so Ill be swapping the guts in the bores. Good point JohnEvans, I will be grinding the lettering off. Thanks to everyone for all the info!
No, on the firewall of early 60's trucks. The linkage on the pedals in those trucks rather makes you want to think that the engineers that designed it had too much time on their hands that week. There is a reason it's done that way though and it somewhat makes sense after you figure out the "why" of it>
I would like to run same master, can these run a disc/ drum set up? I cannot seem to find a direct answer any where
One other thing, IH. used a master cylinder the same size , but the clutch/brake function is is just the other way around. clutch,left and brake, right. The other difference it's got 4 mounting holes in the casting. ..........................Jack
You would probably want to pull the residual valve out of the brake cylinder side and run the inline residual valves to front and rear. What I forgot to mention in my previous post months ago is that this setup in a Chevy/GMC runs a cross shaft setup off the pedals with one shaft running inside of the tube of the other. The brake pedal has a shaft running over to the left to where a lever off it moves the push rod to the brake cylinder and the clutch pedal's top end rides on that shaft with bushings inside if it.
good question on usage for disc brakes since it has a 1 1/8" bore! That would meet the volume req. for the calipers. Spooler41 got a picture of the IH cyl. that you mentioned?
I'm a little confused? Having had a couple early 60's Chevy Suburbans, ('60 & '62) and both were mechanical clutch linkage, not hydraulic. Was this system used on larger trucks, or just certain models, or what???
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