Wheel bearings are one of the most critical — and most overlooked — components on your caravan. Learn to spot the warning signs before they cause a breakdown on the road.
Wheel bearings are one of the most critical — and most overlooked — components on your caravan. They carry the full weight of your loaded van through every kilometre of highway, dirt road, and school holiday dash to the coast. When they fail, things can go wrong fast. And unfortunately, failure on the road often happens without much warning.
At Alpine Caravan Services in Kilsyth, we service bearings on caravans right across Melbourne's eastern suburbs. Here are five signs we see regularly that tell us bearings are overdue for attention.
This is the most common symptom and usually the first one owners notice. A low-frequency hum that gets louder with speed, or a grinding noise from the wheel area, is a strong indicator that your bearings are worn or lacking lubrication. The sound often changes pitch slightly when you change lanes or take a gentle curve — that's because the load on the bearing shifts as the van moves.
Don't wait to see if it goes away. By the time a bearing is audibly failing, the window for a simple repack has often closed. You may be looking at bearing replacement rather than a service.
This is the check every caravanner should do at every fuel stop. After driving for 20–30 minutes, carefully hold your hand close to (not directly on) each wheel hub. A healthy bearing runs warm. If any hub is uncomfortably hot or you can't hold your hand near it, stop and investigate.
Heat is the number-one enemy of wheel bearings. It breaks down grease, causes metal-on-metal contact, and accelerates wear dramatically. In Australia's climate — where summer temperatures already push 40°C — failing bearings have almost no margin before things become dangerous.
Visible grease around the hub, on the inside of the wheel, or smeared across the brake drum is a clear warning sign. Grease leakage usually means a seal has failed, which lets moisture and road dirt into the hub assembly. Contaminated grease loses its lubricating properties quickly, accelerating bearing wear.
If you spot greasy residue around a hub, book it in promptly. A failed seal is a relatively simple fix when caught early. Left unaddressed, contamination can damage the bearings, drum, and axle.
With the caravan safely supported on axle stands, grab each wheel at the 3 o'clock and 9 o'clock positions and try to rock it side to side. There should be virtually no movement. Any perceptible play — even a few millimetres — indicates the bearing is loose, worn, or incorrectly adjusted.
Excessive wheel play also affects your caravan's electric brakes. If the hub isn't running true, the brake magnets can't engage cleanly with the drum, reducing stopping effectiveness. It's a compounding problem that's worth catching early.
This one is subtle and often misattributed to tyre balance or road surface. But a rhythmic vibration that appears or worsens over a certain speed — particularly when towing — can indicate a bearing that's begun to run out of round. By the time vibration is noticeable in the tow vehicle, the bearing is in poor condition.
Most manufacturers recommend a bearing service every 10,000–12,000 km or annually, whichever comes first. If you're a seasonal caravanner who doesn't clock many kilometres but leaves the van sitting for months between trips, annual servicing is still important — moisture can compromise grease over time even when the van isn't moving.
A bearing service involves stripping the hub, cleaning all components, inspecting the bearings and races for wear, repacking with fresh high-temperature lithium complex grease, and replacing seals and split pins. At Alpine Caravan Services, we photograph everything and include this in your written service report.
A failed bearing can overheat and seize, locking the wheel suddenly. In a worst-case scenario, the wheel can separate from the hub entirely while travelling at highway speed. Neither outcome is something any caravanner wants to experience. The good news is that bearing failure is almost entirely preventable with routine maintenance.
If you're based in Melbourne's eastern suburbs and your bearings are due for attention, get in touch with the team at Alpine Caravan Services in Kilsyth.
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