Quote Originally Posted by 35fordcoupe View Post
If I press the brakes the lights flash on then go off. If I pump the brake pedal to build pressure they will come on and stay on consistantly. I have a hydraulic switch and while the brakes work ok I am going to bleed them again when I get the chance. Will air in the system cause issues for this hydraulic brake switch? What else may be the issue? Thanks
Can you give us an overview of your system? Four wheel drums? Discs front, drums rear? Discs all around? Master above wheel cylinders (firewall mount) or below (under floor mount)? Residual valves? Some of the answers given seem to be assuming a system configuration (like brakes being out of adjustment?), which may or may not be applicable based on your system.