1999 GMC Yukon, Do I need to replace the stop light switch if my brake lights only come on when I push the pedal real hard to the floor. I have already replaced the brakes and did a new brake booster. Is it hard to put the switch on the pedal?

Hey do-it your-selfer are your brakes O.K. Do you have to push youpedal down "real hard to the floor" after you hung all these parts on your Yukon! If so check to make sure the vacuum line is hooked up to the booster. Anyway the brake switch itself is not that hard. You can remove a panel under the steering column to get more room. Pull the switch up from the brake pedal bracket till it comes out. Install the new one, connect the wires. If you push it in to far, put both feet under pedal and gently pull up, you'll hear it set itself. Have someone check brake lights while you step on pedal. Good luck, best regards.

Sounds like you are on the right road with the switch. Before I bought a new switch I would locate the switch, it will come in direct contact with the brake pedal arm, and see if there is an adjustment or if it has moved for some odd reason. Sometimes things just happen.