Camshaft: Fault Symptoms, Diagnosis & Replacement Guide
Camshaft faults, symptoms, diagnosis and replacement steps for heavy commercial diesel engines — VADEN technical guide with torque and clearance values.
Technical Guides
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Articles
Turbocharger: Symptoms, Diagnosis, Replacement & Maintenance
Learn how VADEN turbochargers work, spot early failure signs, measure boost and shaft play, and replace CHRA units correctly on heavy commercial diesels.
Engine Oil Pump: Faults, Diagnosis, Replacement Guide
Engine oil pump symptoms, diagnosis, replacement steps, torque specs and OE-matched VADEN ORIGINAL parts for heavy commercial diesel trucks.
Trailer Control Valve: Faults, Replacement & Maintenance Guide
How the trailer control valve (Anhangersteuerventil) works on heavy trucks, its failure symptoms, gauge diagnosis, replacement steps and OE maintenance tips.
Compressor Cooling Plate & Water Cooling: Faults, Repair & Care
Diagnose, replace and maintain the heavy-truck air compressor cooling plate and water cooling: symptoms, internal-leak testing, torque values and FAQ.
Foot Brake Valve: Faults, Replacement & Maintenance Guide
Download this guide as PDF On a heavy commercial vehicle, the component that determines what happens the instant the brake is applied is the brake pedal valve.
Quick Release Valve (QRV): Faults, Replacement & Care
How a quick release valve (QRV) works on truck air brakes: fault symptoms, diagnosis, step-by-step replacement, torque values and maintenance tips.
Clutch Fork: Fault, Replacement and Maintenance Guide
Download this guide as PDF On heavy commercial vehicles, most complaints of a "sinking" pedal, "stiffness" or a metallic "rattle" when the clutch pedal is.
Relay Valve & ABS Relay Valve: Faults, Replacement & Care
Heavy commercial vehicle relay valve and ABS relay valve guide: how it works, fault symptoms, diagnosis, replacement steps, torque values and maintenance tips.
Air Processing Unit (APU/EAC): Faults, Replacement & Care
Air processing unit (APU/EAC) guide for trucks: how it works, fault symptoms, pressure diagnosis, replacement steps, torque values and cartridge maintenance.
Heavy-Duty Truck Gearbox: Faults, Replacement & Maintenance
Heavy-duty truck gearbox guide: fault symptoms, diagnosis, step-by-step replacement, torque values and maintenance intervals from the VADEN technical team.
Oil Cooler: Failure Symptoms, Replacement & Maintenance Guide
Engine and transmission oil cooler guide for heavy trucks: failure symptoms, internal leak diagnosis, pressure test, replacement steps and torque values.
