Ok my dad is changing his brakes. Well he can't get the rear piston to compress enough to place the new disk pads in. He's tried to bleed the brake line by removing the bleeder valve. He used a C clamp to try and compress the piston. NO GO!!! How does he get it to compress?? Thanks

 

u gotta turn the piston clockwise

 

Yeah its a total bitch. they shoulda just made the rear calipers 2 piston so you could drop the pads in from above