PROBLEM! Help compressing brake caliper
I am an avid "do it yourselfer". I have completed brakes on an array of cars and tackled my first job on a VW last night. I am coming to you for some guidance and help...
First my friends car is a 1999 VW Passat and the rear brakes were grinding. We rented the special "tool" to compress the pistons (i guess these screw in). We started with the passanger side rear. we did not have enough room to get this tool onto the caliper, so we disconnected the parking brake cable, the spring back there, and loosened the bleeder valve. We then took some vice grips and twisted the caliper piston head clockwise, enough for us to get the tool on, and then compressed fully. We tightened everything up and went to the other side. We did the same thing but we cant seem to get the piston to compress... so i tried turning it counter clockwise, thinking it may loosen it up if it were frozen, and the piston closed more / increased in lenght... EEK WRONG WAY! so we then tried to turn it like the passanger side and it will not go back in!!! Is there something im doing wrong? Do you need to push down on the piston with a c-clamp while turning it? Is this a sign of a frozen caliper?
Also, does the bleeder valve need to be open when compressing the piston? i heard on VW's that it needs to be or it could mess up the ABS...