Brake master Cylinder ?

[Longesst]

There is an unused plug on the end of my m/c right where the brake line leaves. Should this have something plugged into it? Trying to diagnose rabs light and wanted to start with connections first. Thanks

 

[icanfixall]

I think that unfilled plug is for the cruise control on later model trucks. Do you have the electrical plug in place just under the master cylinder resivour... That has to do with the rabs and it tells you when the brake fluid level gets low... A lite will glow on the dash telling you BRAKES...I think... Its been so long since I have seen that lite up...

 

[nyteshades]

fix all is correct on both counts.

 

[Longesst]

Yes there is a plug under the resevoir. Brake light doesn't come on even with ebrake depressed so I'll check the bulb and see if it comes on.