Hello All
I put power brakes on my non-power truck and started having problems
The front brakes drag and fluid comes out of the top of the MC after driving a while. I guess it expands when hot from dragging.
The truck came with manual JB1 brakes and I put a JB3 power set up on it.
The only difference I can see is the brake MC.
The large reservoir is switched from the back to the front from the JB1 to the JB3 MC.
I can not find a JB1 power MC.
I checked the clearance between the booster rod and the MC and it is not pushing on the MC when the brake pedal is not pushed.
I even tried adding washers between them on the mounting bolts to guarantee it
I also pulled the MC off the booster when the brakes were dragging and they did not free up.
I changed MC's and I still had the same problem.
I did look up the part numbers for the proportioning valve and they are the same
Then I went back to the manual brakes and the problem went away.
Now my question is what is the difference between the master cylinders inside other than piston size, and how do I fix the problem