Originally Posted by
Mike Lassiter
not for sure about your specific truck, but look under the dash to the area the rod from the booster attaches to the brake petal. "USE TO BE" a couple of switches that the brake pedal would push against with the pedal fully up. Some are a slip fit adjustment, some screw adjust. It is posible the switch for the cruise control. The switch would open and break the circuit when you touch the brake pedal slightly (enough to make brake lights come on. When the brake booster pushrod gets disconnected from the brake pedal the switch(es) if slip adjust type, can be pushed back towards front seat enough to cause this. The switch isn't pushed against the pedal enough to be "on" anymore. Typically the booster pushrod will limit how far the brake pedal can go up (not applied) and when the rod isn't holding the pedal, the switch can be pushed back. Possibly oversight the mechanic forgot to make sure both switches were properly adjusted after reconnecting the booster pushrod to the brake pedal.