Rear Brakes help!

[89240sx]

I am changing my rear brakes on my 89 240sx... I have tried to compress the piston but it refuses to move =(

I've tried taking the parking brake cable off and the master cylinder lid is off.... please help is there something I'm missing??

btw these calipers are way too big for most C clamps :rolleyes

I have to try to compress the piston with my clamp to an angle and it compresses only slightly and I cannot turn the clamp handle any further ... let me see if I can find a digicam to show you guys

TIA:help

[89240sx]

LoL how ****ing retarded... I figured it out right after posting.... you need a "special tool" because the piston turns in not compresses :rolleyes

I used a ****ing channel locks

Thanks Anyway!