Were I you, I'd take the time to look into it, because you should be able to lock them up with your Scamp
(at least in the early stages of controller setup, depending on what you have).
If the reason they won't lock up is due to any kind of deteriorating situation (Improper shoe adjustment, corroded wire connections, partial short in wiring, weakened magnet, etc.) it may be getting gradually worse and you might not notice it until they fail you -- I don't mean totally failure, although that can't be ruled out, but just failure to apply full effort just when you need them the most. If your brake parts are from original axle
, they are getting kind of elderly...
BTW, for everyone, do NOT test the function of the breakaway switch with the trailer plugged into the tow vehicle -- Several brands of controllers have warnings that this might damage the controller, esp the newer solid state ones.
Also, anyone contemplating brake parts replacement, be sure to check the pricing on an entire backing plate e/w new shoes, magnets, springs, etc., because this is one of those cases where the whole costs less than the parts, and you won't have to assemble anything, just bolt it on.