[V8] Rear Brakes - V8Q - revisited

[Scott Baumann / PTS Power]

Hi all,    
    Located some rear pads.  Dis-assembled brake ass'y - cracked bleed screw & put a C-clamp on the piston - seems to be stuck.  Any tricks or things I may be missing?  The brakes a very similar to others I have done in years past, and all have compressed with no problems.  Is this piston just stuck tight?  If so, should I be shopping some new pistons??  Thanks

SB in WI