No, the front caliper bolts on a 1990 Buick Regal Custom are not reverse threaded; they are typically standard right-hand threads. When working on brake components, it's important to use the correct tools and torque specifications to avoid damaging the bolts or the caliper. Always consult a repair manual for specific details regarding your vehicle.
Rear pistons are threaded and a special tool (not expensive) is required. Available at Sears or auto parts
power = light green ground = black
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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.
Google 1996 Buick Regal Custom and see.
Make sure caliper pistons are pressed in
Two mounting bolts at rear of caliper - then slide caliper off rotor
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Custom is lower end. Limited has more features.
The calipers are threaded and screw out.