Finally got my overheating issue fixed but after sitting for the past 4 months or so the XJ has picked up another problem. When pushing firmly on the brakes there is a pulsating sort of feel in the brakes. It doesn't really connect back to the pedal itself but I feel it in the whole car. It doesn't have ABS and has never had this issue before. The pads front and rear were redone about 8 months ago. New disks in front, drums in the rear were turned. Any ideas?

 

Warped rotor. Turn rotors or replace.

 

x2

 

This.

Or

severly worn rear drums. This can cause a pulsating, although not as likely.