We have a 28 foot travel trailer with tandem axles. Yesterday while backing it into our driveway, my son noticed a steady, high-pitched noise coming from behind the right rear wheel any time the trailer brakes were applied. Most of the time it was while the trailer was sitting still, but also while rolling either direction. The sound is clearly coming from the brake system behind the wheel. The brakes seem to be working exactly as normal, and they release as well, and the noise is only from the one wheel. The noise always stops the instant the brakes are released. As I understand, the brake is actuated by an electromagnet. What would be making the noise in that mechanism?
Normal on all I've seen. Is more of a humming noise when brakes applied?
For kicks put a old style compass near it. Electomagnet will spin the needle around like crazy. Actually used to use one for pre trip inspection to make sure all brakes worked on each side. As they get worn you might hear them slap againist the metal also, if your near the brake and not at the brake control.
(To cheap to buy new)
1990 37 ft 5th wheel that hasn't moved since 1996 (our best home)
1997 33 ft trailer (winter home in much warmer climate)
2005 25 ft M/H (our "stand up B" for traveling)