The brake pedal goes completely soft no matter how many times you pump it. There's no leakage on the wheels, no visible leakage on the master though covered by ABS booster but the brake fluid had gone below minimum in less than 2 months of being filled to max. it displays vcs, abs, tcs. when i remove the abs relay, the error display goes off and the brake acts better. i put it back and it goes soft again, not holding.
Replace your master cylinder. It is leaking out of the back of the master cylinder and into the booster. If you unbolt the master and carefully look into the booster, chances are you will see brake fluid. Replace it, bleed the entire system, and enjoy your truck again.
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