Brakes problem
1992 Other GMC Models V8 Four Wheel Drive Automatic 140000 miles
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Within the last 2 days, both the ABS and Brake indicator lights have turned on and remained on when I am driving the vehicle. The brake pedal has also become very soft (spongy) and travels towards the floor a lot more than usual. The vehicle stops but not as quickly as before. I can't seem to find any fluid leaks (yet). Any advice on troubleshooting?

is the brake fluid reservoir low? sounds like bad wheel cylinder or line leak