In the original master cylinder, the rod is attached to, and captivated by a disk (a washer more or less). This rod-captivating disk is held in place by a lip in the forward end of the casting. The rear face of the disk pushes the piston to the rear when the pedal is depressed.
The original brake return spring pulls the brake lever, thus the rod forward, ensuring that the internal piston spring (which is located behind the piston) can push the piston forward unobstructed.
I have no idea how your new master cylinder could ever work for this application as you have the linkage set up.
You need to find more info on how your master cylinder is supposed to be installed.
Last edited by 52Carl; 02/16/2022 12:17 AM.
