If you get a star wrench you wont have to worry as they are standard and one of the four will fit.
Use a wrench and place it on the large nut. Push the wrench like you are loosening the nut. The tensioner will rotate and remove pressure from your belt.
The 1990 uses a t50. The 89 is probably the same.
A sharp knife. to pop it. jk.idk
its under the back seat
jack up the tire and then remove the bolts that is holding the calipers and then remove the hose and the calipers will come off. you will need to bleed the brakes when you replace everything back together.
Parking brake? Service brakes? Pedal dropping? Bad Master cylinder? ABS Module?
Remove belt, balancer bolt and get a balancer puller to remove the balancer. Unbolt and unplug sensor to replace it. An air impact wrench that is strong will get the bolt loose.
I had to use an Allen wrench, it wasnt a socket however my lesabre is a 93
Remove the positive cable from your 1997 Buick LeSabre battery. Remove the alternator belt. Remove the alternator wiring harness. Remove the alternator retaining bolts. Reverse the process to install the new alternator.
The calipers are threaded and screw out.