Without more information, it may be because of your foot.
Switch is defective or out of adjustment.
bad ground in fuse box
To add brake fluid in a 1990 Mazda Protege, you need to locate the brake fluid reservoir and check the levels. The reservoir is located on the master cylinder for the brakes.
there is a brake switch under the brake pedal. This is a button that pretty much controls the break lights. you might need to replace this or look through the fuse box under the hood. (blue 15) is the fuse that powers the brake lights.
Above the brake pedal,its black plastic.
HOW DO I TIGHTEN EMERGENCY BRAKE CABLE ON A 2002 MAZDA PROTEGE 5?
Next to the master brake cly.
about 5mm then after that they will get hot and squeak
If there is no brake lights on a 1998 Mazda pickup, check the fuse. If the fuse has blown, the lights will not work.
this is a guess but most Proteges use DOT3
behind the engine on the firewall
brake lights dont work