I have heard that a special tool may be needed to back off the rear brake caliper is this true the car is a 2001 SLS cadillac
Rear Brake calipers on 2001 Cadillac Seville
Yes, this is true. There is a rear caliper retracting tool. Possibly you can borrow one from a parts store that lends out tools if you buy parts from them.
what does the tool look like