To find your problem, you will have to isolate the different components of the system. Remove the two brake lines from the master cylinder and insert two suitable plugs in their place. Start the truck and try the brake pedal. If you now have excellent brake pedal, the problem is obviously in the brakes on the wheels. Remove one of the plugs and re-attach one of the lines. This should help you pinpoint the source of your problem. If the pedal now goes to the floor, you know which one is bad. Follow this procedure to the other brake line.
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Tummy Tuck
thyroid