Typically brake systems in cars and pickups have brake fluid, not air in the lines. There should never be air in your automotive break line
normally loose brake pads or discs
the brake shoes are expanded, and rub against the inside of the drum when the brakes are applied. the shoes are pushed apart by a brake cylinder that is operated by hydrolic pressure sent through the brake lines from the master cylinder when you step on the brake pedal. the brake fluid is what is forced througt the brake lines to the wheel cylinders. springs are attached to the shoes ,and pull them back away from the drums when the pedal is released. it is spring action against hydrolic pressure .
Brake pedal switch bent or loose on its bracket under the pedal? Carpet pushed under the pedal pressing against the switch?
Check the brake light switch on the brake pedal
Hardness in the brake pedal can because by low brake fluid. Air in the brake lines can also cause the pedal to push hard.
air in the brake lines theyneed bleed
When your foot puts pressure on the brake pedal there is a switch that relays the brake pedal being pushed to the lights which makes them turn on.
bad brake light switch
Adjust or replace the stoplight switch at the upper end of the brake pedal under dash area
Follow the brake pedal up behind the dash. The pedal arm ususally operates a button that turns on the lights when the pedal is pushed. The button could be stuck.
You will be adding brake fluid to the reservoir often.The brake pedal won't feel firm.The brake pedal may sink to the floor as you are applying steady pressure.Do a visual inspection of the brake lines looking for that wet spot.
Usually in every vehicle the brake lights come on when the brake pedal is pushed in. There is a switch connected to the pedal in some way to make the light switch on.