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What is wrong with my 96 Chevy S10 if the anti lock brake light comes on and I can stop fine But when it goes off breaks either very hard or work at all?

The ABS light on your 1996 Chevy S10 coming on and then causing either hard or non-functioning brakes points to a serious problem within the ABS system itself, not necessarily the brakes' basic functionality. The fact that the brakes work *sometimes* means the master cylinder, brake lines, calipers, and rotors are *likely* okay (though this isn't guaranteed). The ABS module is likely the culprit.

Here's why:

* ABS System Interference: The ABS system is designed to prevent wheel lockup during braking. When the ABS light is ON, it usually indicates a malfunction *within* the ABS system. The system may be trying to engage, or its sensors/computer are misreporting, leading to erratic brake behavior.

* Hard Braking or No Braking: When the ABS module malfunctions, it can send incorrect signals to the hydraulic control unit which controls the pressure applied to your brakes. This results in inconsistent brake application. Sometimes you'll get full pressure (hard braking), other times no pressure at all (no braking).

* It's not just a light: The light isn't just a warning; it means the ABS is affecting your non-ABS braking. Your car's braking system isn't designed to function correctly without the ABS computer being operational.

What you should NOT do:

* Don't drive the truck. This is extremely dangerous. Erratic braking can lead to accidents.

What you SHOULD do:

1. Have it towed to a qualified mechanic or repair shop immediately. Do not attempt to drive the truck until it's fixed.

2. Explain the exact symptoms: Clearly describe how the brakes behave when the ABS light is on and off.

3. Be prepared for potential repair costs: Fixing ABS issues can be expensive due to the complexity of the system. It could involve replacing sensors, the ABS module, or even parts of the hydraulic system.

Ignoring this problem could lead to a serious accident. Get it checked out as soon as possible.