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Monday, February 10, 2014

Replacing the Trailer Drum Brakes

Some of larger trailers in service today have drum brakes installed. They provide sufficient stopping power for the trailer if the towing vehicle also decelerates. However, the long drives and stops may take their toll on the trailer and the brake system – as such, you need to get to work on replacing them right away.
The first thing to do is to raise the trailer on jack stands and remove all wheels. Once they are off, start using a hammer to gradually shake the drum loose from the assembly and use the drum brake spring tool to remove the hold-down spring for now. Needle-nose pliers are to be used in removing the return springs, but no tools are required in taking off the adjuster-level springs from the bottom of the primary shoe. The primary and secondary pads can then be removed and replaced.

In setting up the brake’s replacement pads, put in the primary pad on the adjuster and the notch of the wheel cylinder, then reattach the return and adjuster springs. Repeat the process on the secondary pad. You can then lock in the hold-down spring and cap before placing the drum on the pads and setting the entire assembly back on the shaft.  

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