Hi. I have a Montesa Cota 315 1999. F Brake master cyl is a Grimeca
I like to go practice pivot turns in the back yard. But recently after doing them, the front brake goes to the handlbar and i have to pump it to get something back. It happens every time I do them. I've bled the system, wound the adjuster right out, rebled. Checked the caliper and all that. But its still doing happening. (the brake stays firm when I'm just noodling about but when I go back to the pivots I lose pressure again) There are no leaks that I can see. Nothing at the caliper, hose is fine, connection look good. I even filled the fluid reservoir right up, just in case what I'm doing is allowing an air pocket to get into the line
Has anyone has this issue? Who will be the first to tell me my master cylinder needs rebuilding? where is the air getting in and why?