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.
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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.