I have a problem with my dash brake light coming on. It doesn't happen continuously, but it is on most of the time. When I put the e-brake on, the light gets brighter, when I take it off, the lights dims but doesn't go out completely. First thing in the morning the light sometimes will go off, but comes back on after some driving. I have replaced the master cylinder already and that didn't change anything. Any ideas would be appreciated.

91 SR5 Xtra Cab, 298000km, 4" lift, 56" rear springs, 33-12.5R15 BFG Mud-Terran T/A KM2.....and an '85 axle still waiting to go in.