2007 S40 just got it used, now has 78,000. Frt. wheel drive. 2.4l. Had some shimmey upon braking downhill at 55+ MPH. So thought I'd change out my brake fluid, then found I can't even get the R.R. valve off. Been using PB Blaster and heat and light tapping to get the threads to loosen up. had a pair of vise grips on the nut end...all no go. Have had the car up on the blocks now for a day and a half. When do I give up and go for new Calipers?
Best place to get some good rotors?
Rear Pads are 4.5mm and the Disks are 11mm.
Thanks!

 

Drill it and tap new threads?

 

getting new calipers and rotors..giving up