How do you check your breaks?

How do you know if your breaks are both working (inside both drums)?  Will the break controller show an error if there is a disconnected wire or short?  The reason I ask this is that when I put the axle riser on the pod, I didn't cut the zip ties, but did notice a slight tension of the black hose that held the wires while I was installing the axle risers.  I also had that instance where the axle slipped off the jack while installing the last axle riser which put tension on the wires.  There isn't any, or much, slack in the wiring right now.  Thanks for the feedback.  Before my next trip, I plan on crawling under the pod to make sure the axle riser nuts are still tight and the break wiring is still good.    

Thanks for the info.  I crawled under there today to make sure the axle riser bolts were tight and also checked the wires and those black sleeves that hold the wires.  It looks like the wires that attach directly to the drum are fine.  I can usually tell if the brakes are working as I brake the tow vehicle, so I think I will be fine.  

I've noticed some 'thumping' in trailer brakes when I apply braking - this is my 1st season w/rpod since Nov 2011 purchase from private party.  I've only done some local camping so far and assume this is just a rusty drum.  Should I expect this to to go away (planning on a 1000+ mile trip in June) or should I examine the drums?  Does anyone have any experience or tips? Do the drums just pull off when wheel nuts are removed?  Thanks.