Properly functioning trailer hubs and brakes are essential for safe towing. Replacing a worn hub does not require a full mechanic shop — just the right tools and careful attention to detail.
Incorrect hub installation or improper bearing preload is one of the leading causes of roadside trailer failure.
What Is a Trailer Hub?
The trailer hub is the mounting assembly that allows your wheel to rotate on the axle spindle.
- Idler Hubs – No braking capability.
- Brake Hubs – Contain electric or hydraulic brake components.
Brake Hub – Inside & Outside View
Hub Assembly Breakdown
Tools Required
- Floor jack
- Jack stands
- Impact driver or ratchet
- Socket set
- Flathead screwdriver
- Pliers
- Clean rags
- Torque wrench
Trailer Hub Replacement Video
Step 1 – Remove the Wheel
- Secure trailer with chocks.
- Jack up frame and support with stands.
- Remove lug nuts and wheel.
Step 2 – Remove the Dust Cap
Step 3 – Remove Cotter Pin & Spindle Nut
Wear gloves to prevent contaminating brake components with grease.
Step 4 – Remove the Old Hub
Inspect Brake Assembly
- Check shoes for grease contamination.
- Inspect magnet wear.
- Verify springs and wiring.
Step 6 – Install the New Hub
- Install outer bearing and washer.
- Torque spindle nut (example: 55 lb-ft).
- Back off nut and retighten by hand.
- Install new cotter pin.
Step 7 – Reinstall Dust Cap
Step 8 – Reattach the Wheel
- Finger-tighten first.
- Snug in star pattern.
- Torque to final specs after lowering trailer.
- Re-check torque after 10, 25, and 50 miles.
Bearing Replacement Video
Always replace grease seals when replacing bearings. Reusing seals is a leading cause of repeat failure.
Repeat this procedure for the opposite side and for additional axles if applicable.
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