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Q: What is wrong and what is the fix, sometimes when Im braking the pedal gets hard on 1998 GMC Jimmy

also makes a hydraulic noise and the brakes dont work, when you push really hard they will work again
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You didn't mention the ABS light was on! Have the system scanned, lots of sensors, the module, valves ect. it could be.
There will be codes if you put the fuse back and drive it then scan. Or leave the fuse out but you will no longer
have anti lock brakes. Most common problem is wheel speed sensor(s) or connections. But not the only one.
It is the big black round thing behind the master cylinder. Suggest towing to repair shop!
I agree with everybody.
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