on a 2002 GMC Sonoma 4x4 with a 4.3

double feed, double trouble, apparently its been on maybe quite a while from the parking brake switch, now you acquire a master cylinder problem and it also sends a signal ,enough total voltage to light it at full bright. low brake fluid will bring it on, but then you wonder where did the fluid disappear to, that's the next mystery, ck ur brk resevour

Thanks I will go do that now

Brk is Full someone had told me that it could be a ground wire somewhere what do u think?

if I replaced my egr valve an codes P0401, P1406, P0401 still show up what is it that needs to be fixed an also car isn't using the antifreeze in it?