Checklist for Replacing Semi Truck or Trailer Brake Drums

Brake drums are important for your safety and the safety of those around you. Replacing a brake drum can be tricky if you don’t have the casting number available. To save you time, today we will be going over what you need to know when looking to replace a brake drum.

Hub-Piloted or Stud-Piloted

The main difference in a hub-piloted and stud-piloted brake drum is the way it is center mounted onto the hub. Stud-Piloted drums will require lug nuts to center it to the hub, whereas a hub-piloted drum will require for the hub itself to have metal studs or "tangs" on the hub for it to center to.

Bolt Requirements

The main difference in a hub-piloted and stud-piloted brake drum is the way it is center mounted onto the hub. Stud-Piloted drums will require lug nuts to center it to the hub, whereas a hub-piloted drum will require for the hub itself to have metal studs or "tangs" on the hub for it to center to.

3 Common Measurements to Take

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Pilot Surface

You will need to know the distance of the pilot surface. This can be obtained by measuring the distance of the center hole of the drum, otherwise known as the Pilot Hole.

Stud Centers

For the stud center measurement, measure the distance from the center of a stud hole, straight across the pilot hole, to the center of a stud hole on the otherside of the drum

Depth

Make sure to know the overall depth of the drum. In addition, measure the overall depth of the drum. This is best done by placing the measuring tool inside of the pilot hole, and measuring to the top of the pilot hole.

Other Measurements You Can Take

Brake Surface Diameter

Bolt Circle Diameter

Brake Surface Width

Size of Bolt Hole

Check Out These Hub & Drum Assemblies

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