Case studies

Real Repair Cases

See how we diagnose the real cause and document every finding — real trailer ABS, brake, and wheel-end jobs from our shop.

From the shop floor

Examples of how a structured diagnostic finds the real cause — and how documented findings keep every repair transparent.

ABS Fault

Problem: A dry van came in with an ABS light that kept returning after another shop replaced the ECU. The fault code pointed to a wheel speed sensor circuit.
Diagnosis: Signal testing showed a dead sensor circuit, not an ECU fault. The sensor was seized in the hub from corrosion and had to be carefully extracted before a new sensor and extension harness were installed.
Outcome: System cleared and verified in the shop by simulating wheel speed signals — no unnecessary ECU replacement, trailer back in service the same day.

Brake Repair

Problem: A flatbed operator reported the trailer pulling and uneven brake wear. They wanted to know which axle was actually the problem before authorizing work.
Diagnosis: A measured brake inspection with photos documented worn shoes and an out-of-spec drum on one axle, plus a slack adjuster out of adjustment.
Outcome: Shoes and drum replaced on the affected axle with brake adjustment included. Customer approved the plan after seeing the documented wear.

Wheel-End

Problem: While extracting a seized ABS sensor, the hub had to be removed — revealing a wheel seal that was already weeping oil onto the brake.
Diagnosis: Photo and video documentation showed contaminated brake components and a failing seal that would not survive being reused after the hub was pulled.
Outcome: New wheel seal installed while the hub was already off, avoiding a second teardown later. Customer approved the added work before it was performed.

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