Red light is on in my car

SOURCE: What does warning light mean?

Usually means that there is a problem with your braking system. Note that brake fluid is HIGHLY TOXIC so please be careful when handling it. Check the brake fluid level in the engine bay brake fluid reservoir to ensure that its upper level falls between the MIN / MAX marks. If it is below the MIN level in the try topping it up to the MAX mark with the appropriate rating of brake fluid, but as there may be air in the braking system ideally you should arrange for the car to be transported to a garage to have your braking system checked and the brakes bled. There may be a hydraulic fluid leak in your braking system somewhere along its length (park the car on a dry level parking area and look to see if any 'wet' marks appear on the tarmac - this is a distinct possibility if the brake fluid level in the reservoir is lower than the MIN level. Look for unexpected wetness on (a) the inside of the road wheels, or brake cylinders (any wetness found could indicate damaged seals in the brake calipers or cylinders) and (b) along the length of the brake pipes and at any of the junctions of the Master Cylinder.

SOURCE: 2000 Sienna exclamation light on dash

The exclamation point is the parking brake, not the low tire. The low tire is on the side with the gas gauge and looks like a tire going flat (with a wavy bottom line).