Had the same sort of experiences with a '92 and '93 Lumina.I assumed falsely it was the type of thing that worked or didn't.
Brakes were weak, wouldn't engage the ABS except on ice. Took both feet to make a panic stop.
The first-gen W bodies are renowned all over the internet for weak brakes.
Installing a direct-replacement power booster fixed both cars. No weak brakes now!