How do you diagnose ABS brake problems on a 1995 2WD S10 Blazer?

Examining the braking system is the best place to start when diagnosing an ABS system for the 1995 2WD S10 Blazer. Examine the brake fluid reservoir to check its level. An almost depleted container is a sign of fluid leaks. Leaks can be identified at the calipers, master cylinder or modulator.