250-500cc Left hand rear brake

Hey out there, i got the bug to get setup with lhrb last year. Last spring found a brembo master cylinder for four stroke. Built a custom plate to mount it up. It worked great for like 4-5 rides. Then Literally the weekend i felt finally comfortable with it i was gonna buy one from rekluse. Then that last ride on a warm day my rear brake comety locked up and brake line of all things spurted brake fluid. I guess maybe I had it to bordeline for adjustments? I out my original two stroke master cylinder back on for last year. So i know brake is fine. Id like to mount it up again but wanted advice on how much adjustment i should make sure there is..what to be carefull of etc.

Could it of been a faulty line?

Possibly, but its suspicious it happened a couple rides after installing the other master cylinder

Humm very strange, do you have the rear brake pedal aswell as the hand mount one? Could of blown out the line if you had foot and hand on at same time.

I hadnt mounted the lhrb yet. This is what it looked like right before it locked up

Did it seem like the brakes were dragging? (thinking it caused the fluid to boil)

I would say the master cylinder's piston itself isn't releasing all the way and it's causing the brake caliper to drag. This will cause it to lock up and if it is still ridden it can burst the lines. Remove the rod end from the pedal and check for slack. The actuator rod connected to the pedal may have slack but check to see that the piston it pushes on in the master cylinder is actually returning to it's fully released position.

the piston will be covering the hole to the reservior . so the system is closed .
how much preload is on the master cylinder ? did you have to push the rod in to get it attached how you have it ?

Yes i had to push it in to get it attached. It sure "seemed" like when i released the rod it would retract all the way. But...

But you said you mounted it in First post.... Ahh fek it you guys are all on this one anyway lol firecrotch you is in safe 'ands now ayieete.

It was perfect for a couple rides until the last psrt of the ride where it failed. I was loosing power(draging) and i was thinking uh oh..i am loosing compresion. Lol wrong

Back it off plenty enough to get the slack needed and give it a try then.