Remove lower caliper bolt (actually the upper one is a pin), lift the caliper, replace pads. The clips and the bracket might however need some cleaning.
The minimum thickness specs are stamped into the rotors.
The master cylinder contains the reservoir for the brake fluid. This is where you would add it on an 1990 Cutlass Supreme.
It's on top of the brake pedal under the dash.
It could be the brake fluid reservoir is low and is telling you that the brakes need attention.
Bleed the master cylinder.& then rebleed the system.
Just tell the parts store what type of car you have and they will be able to get you the right pads.
The brake pads on an Olds Sierra are a wearable part. When replacing brakes it is better to change both fronts or both rears at the same time.
Pull the tires off and take the brake calipers off and the rotors will pull off.
you need to check the switch on parking brake try to unplug
FRONT OR REAR ?
There seems to be a safety switch system, the brakes must be applied to release the transmission from park. Don't know location of linkage, if mechanical or electrical. Assembly could be in transmission of console. If no joy, then check wiring and connectors. Do brake lights work - then brake switch probably ok.
where is the brake light switch for 1996 Oldsmobile cutlas supreme