105 Rear Calipers on Alfetta

[NSharpley]

I had this problem on my 75 when I put 105 callipers on the rear. The rear pistons would retract. Everything new or rebuilt and no air in the system. After advice from Mike. I installed a 2lb check valve in the rear brake line. Problem solved. Best brakes I've ever had.

Hey Gusto,

Where in the rear line did you install the check valve?

[fazersix]

I had a similar issue on my Suzuki SV650 front calipers. The pistons would retract, even though I had rebuilt the calipers.
Pump the lever and second/third pump firm lever. Bled and reverse bled, loads of brake fluid later, no improvement!
I pulled the pistons out again and applied a little rubber grease to the seals, this fixed the problem!