You have to make sure you dial up the gain on the brake controller so the trailer brakes come on quicker and stronger. This will eliminate the bump.
Also make sure the trailer drum brakes are properly and equally adjusted. The could be a case where you may have brakes that are not equally adjusted, worn brake magnets, worn brake shoes or there could be a fault with the factory controller.
If I were in your shoes I would start with:
- dialing up the gain on the controller and if this doesn't help;
- test each wheel by unplugging the umbilical cord and pull the emergency brake pin and check each wheel with a compass. The North arrow should swing fully toward or fully away from each brake drum. If his doesn't help;
- adjust the brakes shoes on the trailer with a handy dandy brake spoon; If this doesn't help;
- inspecting the brakes by pulling the drum to check the magnet, shoes and springs and associated wiring. If this doesn't help;
- have the brake controller checked to see if it works properly - output amperage. Probably need a dealer for this check. If this doesn't help;
- replace the factory controller (I have never heard complaints over the Ford factory controllers unless they have gone bad).
Steve, Christy, Anna and Phoebe (Border Collie)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley Arrow hitch with adjustable stinger
WBCCI # 3072