I have a 92 flareside, 351, e4od, I think abs on the back. The other day I was putting on new pads on the front and noticed two little button type things on the brake valve under the hood. one was pushed in and the other was out. Me being curious pushed the other one in and couldn't get it back out. Does anyone know what these are? My books don't show anything about them.

 

where are they located?

 

Hmmm, don't recall anyting like that. I'll check the trucks when it stops raining.

Adrianspeeder