Hi struggling with brake light on dash on my 2004 .3500 express campa tryed level switch and park brake switch both ok what else is in circuit thanks in advance

 

There might still be a pressure balance switch that tells you if half (front or rear) of your hydraulic system. Could be an internal leak in the master cylinder if that is the case. With all the electronic stuff though you likely should get a scan tool on the ABS.

 

Thanks will check for a biased valve in brake line .hope to get scan tool sometime next week but on lockdown

 

sorted now abs pump us thanks for the help