I believe that vehicle uses torx. Can anyone else verify?
I had to use an Allen wrench, it wasnt a socket however my lesabre is a 93
5/16" allen
It looks like and is a 3/8 inch allen wrench for a 91 park ave ultra and is a 3/8 allen wrench!
probably 3/8"
3/8ths
Well the fast answer is "whichever one fits", but any hardware store would have them.
you have to have a tool called a cube. it is bought at most auto parts stores for under $15. once you have that secure the caliper and put your wrench to tighten and just keep cranking it until it is all the way in.
Make sure caliper pistons are pressed in
Two mounting bolts at rear of caliper - then slide caliper off rotor
possibly a t-50 torx head bit on a ratchet that's what i had to use on my 95 lesabre IT IS NOT A TORX BIT IT IS A 3/8 ALLEN
On my 1990 Buick Regal, I need an 18mm wrench , a 10mm wrench, screwdriver, jack, and a can of brake cleaner