I'm no huge expert but my car's calipers were jammed when it arrived. I COULD move the calipers but only by pumping the pedal hard and in rapid succession. I suggest you try this yourself (this is with the bleed nipple closed). Once the pots were out, I put a little bit of lubricating oil around the pots and levered them back in. They've worked fine ever since. I suggest with the new parts/seals etc, the pots may be a little "dry". You should ask James Russel-Grant about the magic tool he created to sort his brakes out. I believe he welded a drilled-out bleed nipple to a tyre valve, and using a foot pump, was able to pop the calipers open, lube them up and reassemble. www.dmc12.co.uk Best Wishes Martin #1458 basfe25 wrote: > Hi all, here I go with a question on brakes. I just installed a new > Brake Master Cylinder and bled out the lines (I bled the master > also). Here is my problem. The rear brakes will lock up when the > brake pedal is depressed but the front will not...they don't even > look like they move. <snip>