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thank you every body! seems i am a little slow but thanks to every one i got,:razz: once again thank you all!!!!

HI every body thank you all for your reply's it clears up a lot of questions for me. but i am still a little confused, my truck in the front not rear says emergency it has a shut off valve and then other drivers front says service. when the truck is running their is no air in the front may be my...

Hello all, i have a m813a1 81 model, can anyone out there explain the four air lines that glad-hands connect to? I understand the 2 at the the rear are for trailer brakes. The front two, one says emergency with a on off valve the other says service no valve how are these to be used? One more...

thank you very much for the explaintion, it helps me more understand my machine thanks again

Mep 003a Hello does any body know what the five small wires going to the main braker do? Thanks in advance