read the owners manual
Look at the level in the brake fluid reservoir.
check your fluid level or your linkage
Check your brake fluid. Next maybe your brake lines need to be bled. OR you just might need new brakes.
In a 2002 Ford Explorer Sport : You check the brake fluid LEVEL in the brake fluid reservoir in the engine compartment . It is on the drivers side of the vehicle , near the firewall ( that's the metal wall that divides the engine compartment from the passenger compartment ) It is a plastic reservoir that allows you to check the brake fluid level just by looking ( you only need to remove the cap if the brake fluid level is not up to the full mark and you are going to add the DOT 3 brake fluid that is required
The most likely answer is the Parking Brake is set.
Check brake fluid level Check to see that emergency brake is fully released
Check your brake fluid.
Check you brake fluid and the brake switch on the proportioning value. If the fluid level is ok then disconnect the switch to see if the light goes out. Also check the parking brake switch.
Check your brake fluid level.
check the brake fluid level. check all the brake linings for thickness.
This warning indicates that you are low on brake fluid in the resevioir. Open the hood, check the fluid levels. If this is not the case, i would double check your E-Brake and make sure that it is fully disengaged.
To put brake fluid in a 1997 Ford Explorer, you must locate the brake fluid reservoir. Once you locate it, unscrew the cap, and replenish the brake fluid.