Assuming I can't rebuild the brake booster, see previous post, my local parts store lists two replacements, a standard and a heavy duty. Assumption is the stronger model was for turbo cars, anyone know the difference?

 

The turbo and NA brake boost / master cylinder combos were slightly different, so stick with a turbo version to be sure. Turbos all had 4-pot front brakes, while some NAs only had single piston fronts, so they would have the stronger of the two versions.

 

Thanks. I have an '87 nonturbo but I'll look carefully at the front caliper.

 

you most likelly have the single piston caliper.