I have run into a problem with my S4s rear brakes. I had planned to change the rear pads for the first time, I read up on how to do it on LotusEspritWoorld forum and it sounded straight forward. I got the caliper off and removed the pads, but the piston doesn't have a slot in it , only two holes about 3/4 of inch apart. My Question is do I need a Special Lotus Tool to retract the piston?? and which direction do I turn the piston to retract it?? I have tried to turn it using a pair of needle nose pliers but it's very hard to move.