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Recommendation for Installation of a Brake Mounting Flange on a Trailer Spindle and Axle  


Is a mounting jig required to precicely locate the flange to spindle? I am a steel fabricator/ welder by trade, with a flat bench to work from. Please explaing the easiest way to mount the backing plate/ flange plate to the spindle. Possibly some pics?


Expert Reply:

Welding a mounting flange, possible item # 4-35, is a very precise installation. The flanges need to be installed square and concentric to the hub and drum assembly and each other. If the flange is installed incorrectly rapid brake lining wear, improper braking, trailer dog legging, bearing failure, rapid tire wear and, worst of all, weakening of the axle can occur.

Usually special jigs are used to install the flange. The jig will keep the flange square and concentric to the axle and spindle and will not allow the heat from the welding process to warp or pull the flange out of shape or position. I would recommend a welder with experience in trailer building for this installation. I do not recommend this installation for a person inexperienced in trailer building and repair.

To determine the correct position for the mounting flange you can assemble the mounting flange, hub and drum and brake assembly on the trailer spindle. Adjust the brakes in the assembly until they hold securely inside the drum so that they will stay in position. You can then mark the spindle in the location that the mounting flange needs to be welded.

At this time we do not install brake mounting flanges at our facility so we do not have photos of the installation or jig used by trailer manufacturers.

expert reply by:
Bob G

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