The brakes on my TT needed a 'break in' period. Initially they were very poor and I had to have my brake controller set very high. The brakes improved greatly over time and now they are very good so my brake controller is at a normal level.
(I glanced through the posts and didn't see anything regarding breaking in the trailer's brakes.)
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LIP Sheet - 0139
AXLES AND SUSPENSION
BREAK-IN PERIOD FOR ELECTRIC DRUM BRAKES
The break-in period is a typical phenomenon with drum brakes and especially electric drum brakes. Electric
drum brakes will require a break-in period to achieve full performance. This break-in period applies for new
axles and any time new brake shoes and/or magnets are installed as part of regular maintenance.
Lippert Components has found through extensive brake testing that the break-in period for our drum
brakes can range from 20 to 50 brake applications. Brakes can be seated in by applying approximately 8-10
volts to the trailer brakes at an initial speed of 40 mph and allowing the truck/trailer combination to slow
down to 20 or 25 mph. For best results do not use truck brakes during this procedure. The trailer brakes will
seat -in faster by using them to stop both the truck and trailer. The easiest method is to apply the trailer
brakes using the manual activation lever located on the in-cab brake controller. Care must be taken to not
overheat the lining material, therefore brake applications conducted at one mile intervals will suffice.
The driver should feel a noticeable difference in the brake performance during this period, sometimes in as
few as 10 applications. After 50 applications, the brake lining material will be fully cured from the heat and
develop close to 100% contact with the brake drum surface. This break in period not only seats the shoe
lining material but also seats in the brake electro-magnets. During the break-in period, the linings will wear
at a faster rate than they do after they are seated in.
Brakes should be manually adjusted after the first 200 miles of operation and periodically thereafter,
approximately 3,000 mile intervals.