Great or oil on linings or magnets
Clean or replace connectors
Scored or grooved brake drums
Correct Controller setting
Re-burnish or replace linings
Correct loading. Check at
weighbridge
Poor Synchronising with controller
Adjust brakes as per instructions
Test and rectify or replace
Loose, bent or broken components
Inspect and replace components
Insufficient wheel load (dual Axle)
Correct trailer level to even load