This is what my owners manual says for my '01 check gauges light illuminates when voltmeter, oil pressure or temperature gauges indicate a reading too high or too low. because when your braking I'm Thinking alternator. Possibly oil pressure but o/p light isn't coming on(unless not working) Question to eliminate oil pressure, does it come on when at idle and braking or when driving and braking? aand how's your temp/coolant? I would take a peek at the oil/coolant to make sure coolant isn't in the oil or vise versa. Coolant in oil can make it overheat though you never mention overheating but worth the look. Soo after all this spamming :roll:
1 I should read closer 2. if oil pressure and temps are good next would be the alternator/ battery. And if everything checks out, the sensors themselves are on their way out. For now I would disregard my first post about the brakes