Chrysler Repair: 2001 Chrysler Disk Brakes, tightening torque, disk brakes

Question
I have a 2001 Chrysler.  It is a PT in fact, but the question I have can apply to **any** car with this problem.  I have ABS and rear disk brakes and I recently replaced the front pads and rotors.  As I have 75,000 km on it I thought that it would be worthwhile to also bleed and replace the brake fluid.  Unfortunately, the bleed fittings on the rear calipers (at least those) are siezed. My question is this: Can you suggest a means to release the fittings OR should I give up the task for the risk of shearing them off.  I don't tow anything, however, the car is driven in Canada and therefore, I otherwise consider it to apply to the "severe" service category in the owner's manual regarding maintenance requirements.
Thanks for your help.

Answer
Hi Andrew,
If you can let it stand for about a day, or at least overnight, I would try some penetrating oil or WD-40 on the thread/cylinder interface, repeated applications if practical, in small amounts with gentle tapping on the fitting to encourage penetration into the threads. And you would want to use a box end wrench of the proper size when you later try gently rocking the fitting back and forth to ultimately loosen it up for removal. No brute force. Sooner or later you will want to bleed these lines so why not do it now before it gets more bound up? Tightening torque is about 10 foot-pounds on the bleeder so you would want to stay in that range for removal too.
Roland