Investigate Failures After Storage
- Identify storage-related brake, suspension, and wheel-end deterioration.
- Inspect and test components without contaminating friction surfaces or bearings.
- Verify safe return-to-service readiness.
- Floor jack and frame jack stands — Raise the trailer at approved lifting points and support its frame during inspection; never work beneath an unsupported trailer.
- Torque wrench and sockets — Verify suspension fastener torque and tighten wheels to the applicable manufacturer's specifications.
- Digital multimeter with ohmmeter function — Measure magnet resistance with power disconnected and the magnet isolated from parallel circuit paths.
- Inspection light — Examine suspension components, seals, linings, drums, and armature faces for deterioration.
- Cleaning brush and clean shop wipes — Remove loose corrosion and debris while protecting bearings and keeping friction surfaces free of lubricant.
- Battery charger — Charge the breakaway battery using a charger suitable for its battery type.
Storage preparation addresses conditions that can later appear as brake or running-gear failures. Protect the breakaway battery from weather, support the trailer frame to remove tire loading, and lubricate exposed mechanical moving parts.
During extended-storage inspection, examine suspension wear and fastener torque, then inspect linings, drums, and armature faces for wear, scoring, damage, and corrosion. Return each drum to the spindle and brake from which it was removed.
Magnet testing complements visual inspection. Lippert specifies a 3.2-ohm magnet check in its storage procedure and replacement when magnets are shorted or excessively worn; values vary by maker and magnet. Rust removal from drums must not contaminate bearings, and brake lubricant must stay off friction surfaces.
Return to service includes seals, bearing lubrication and adjustment, wheel tightening, lights, brake engagement, and synchronization. Confirm that the breakaway battery is charged, the load is within the trailer rating, the tires are suitable for service, and the trailer tows level.
How It Works
Storage creates distinct failure mechanisms
Moisture promotes corrosion on drums, armature faces, and exposed moving parts, while prolonged tire loading can contribute to tire deformation. Weather protection for the breakaway battery, frame support to remove tire loading, and lubrication of exposed mechanical moving parts help limit storage-related deterioration. The lesson's breakaway battery charging reference is At least every 90 days.
Visual inspection and electrical testing work together
Corrosion, scoring, wear, and lubricant contamination can interfere with friction and brake engagement even when a magnet passes an electrical check. Lippert's storage-procedure magnet resistance reference is 3.2 ohms, but the applicable maker and magnet specification must govern the test. Shorted or excessively worn magnets require replacement; resistance testing does not replace inspection of the magnet friction face.
Clean assembly and complete verification
Rust-removal debris can damage bearing surfaces, while grease or oil on linings, pads, or magnet friction surfaces can compromise braking. Preserve each drum's original spindle and brake location, then complete seal inspection, bearing lubrication and adjustment, and wheel tightening. Return-to-service checks also include battery charge, connections, lights, brake engagement and synchronization, loading, tires, and level towing.
Step-by-Step Procedure
0/7 doneLippert storage references; values vary by maker and application
| Breakaway battery charging during storage | At least every 90 days |
| Storage-procedure magnet resistance check | 3.2 ohms |
Diagnostic Chart
| Symptom | Check | Spec / Expected | Likely cause & fix |
|---|---|---|---|
| Brake engagement is weak or uneven after storage. | Inspect linings, drums, and armature faces for corrosion, scoring, damage, wear, and lubricant contamination; inspect and electrically test the magnets. | Lippert storage-procedure reference: 3.2 ohms. Verify the applicable maker and magnet specification; replace shorted or excessively worn magnets. | Corroded or contaminated friction surfaces, damaged components, or defective magnets can reduce or unbalance brake engagement. Basis: Lippert-Axle-8K-16K-Manual |
| A magnet resistance reading is inconsistent or implausible. | Disconnect power, isolate the magnet from other circuit paths, and verify clean probe contact and sound meter leads before repeating the measurement. | Use the applicable magnet manufacturer's resistance specification. | Parallel circuit paths, poor probe contact, or faulty test leads can produce misleading readings. Basis: General shop practice |
| The breakaway battery is discharged when storage ends. | Review weather protection and charging history, inspect connections, and confirm that the battery is charged before return to service. | Breakaway battery charging during storage: At least every 90 days. | Neglected charging or weather-related deterioration may leave the breakaway system unready for service. Basis: Lippert-Axle-8K-16K-Manual |
| Wheel-end roughness or looseness is found during storage inspection. | Inspect seals and bearings, assess lubrication and adjustment, and determine whether rust-removal debris entered the bearings; verify suspension condition and fastener torque. | Protect bearings during rust removal, inspect seals, lubricate and adjust bearings, and verify specified fastener torque before service. | Contamination, lubrication problems, incorrect adjustment, or worn and loose components may compromise the running gear. Basis: Lippert-Axle-8K-16K-Manual |
At the Bay: Diagnose the Case
CASE 1 / 4
Brake engagement is weak or uneven after storage.
- Test
- Compare
- Correct
Select the next check
Basis: Lippert-Axle-8K-16K-Manual. A likely cause is a hypothesis; confirm it with the applicable service procedure before repair.
Common Bay Mistakes
- ✕ Working beneath a trailer that is not securely supported by its frame.
- ✕ Treating the Lippert magnet resistance reference as universal.
- ✕ Allowing rust debris into bearings or lubricant onto friction surfaces.
- ✕ Mixing drum locations or skipping final return-to-service checks.
Quick Check
Practice only — not scored.
Plan the Service Sequence
Planning practice only. Follow the applicable manufacturer's instructions, employer safety program and qualified supervision on real equipment.
Plan the first action. Compare the service steps with the bay mistakes.
Source: Lippert-Axle-8K-16K-Manual — 27-28