Break problems I have a 2001 grandprix, this just started yesterday, it has 102,000 miles on it. when ever i start to break and turn the break pedal pulsates and there is a whining noise coming from the under the hood on the left side, anyone with suggestions it would be appreciated.

piston rings or injectors.

poor gaz flash point, spark plug,tps sensor out of range,MAP or MAF defect no code.

Check fuel line fuel pump

i would replace the belt. if the belt breaks you could bend the valves. i had mine break at about 102,000. bent 4 valves.

I’m happy to help further over the phone at https://www.6ya.com/expert/kenneth_3efc1f8510674f04

No there is a brake switch to turn on the brake lights when you step on the brake pedal. It is located near the rake pedal under the dash. It has more then likely failed.

Brake booster seal leaking.

Sounds like a wiring short somewhere. With the car not running, how do the brake lights look when you press the pedal? Check if things are different with headlights on or off... don't guess. Could be a bad ground connection also. Also, make sure your battery is charged and the alternator is working.

Check the brake light switch should be a orange wire with 12v then a white wire with 12v when the pedal is pressed.If htat cks good then ck the hazard switch by moving it up and down and wiggeling the knob with the brake pedal pressed if they start working then your multifunction switch is bad and needs to be replaced.

CHECK YOUR ACCELERATOR PEDAL POSITION SENSOR.LOOK FOR LOOSE BOLTS OR LOOSE CONNECTOR.THE APP SENSOR IS LOCATED ON ACCELERATOR PEDAL ARM.

Your truck has sealed bearings in the front but they can go bad after several miles. If the truck is not stopping straight or you are getting a pulse through the break pedal (and sometimes a shimmy in the steering) then it's time to replace the rotors and pads. If the truck is stopping and driving fine then I wouldn't worry about it.