after i replaced all four (4) brake pads & now all the brake lights on dashboardstay on
Brakes on 2003 Mazda Mazda6
I would start by bleeding your brake system to remove any air that possibly got in your system. The brake light usually indicates a Hydraliuc issue. You may have to clear your ABS computer as well.
Check your brake fluid level. It may be low and setting off the "service brakes" light on your dash. Add fluid to the master cylinder reservoir as needed.