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.
Heavy-Duty Truck Technical Blog: Air Brakes, Compressors, Parts & Maintenance
Expert resources for heavy-duty professionals: technical guides on air brake systems, compressors, transmission and engine parts, failure symptoms, maintenance intervals and OE cross-reference charts.
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Recent Posts
Cab Tilt Pump: Faults, Replacement & Maintenance Guide
If a truck cab won't tilt, won't hold or settles back down, the hand-operated cab tilt pump's check valves and seals are the usual cause: diagnosis and fix.
Levelling Valve: Faults, Replacement & Maintenance Guide
An air-suspended truck or trailer sitting low on one side or not holding ride height points to the levelling valve lever setting: diagnosis and replacement.
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
Pedal free play or unbalanced braking on a heavy truck often traces to the dual-circuit foot brake valve: fault diagnosis, gauge testing and replacement.
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
In a heavy truck a sinking or rattling clutch pedal usually starts at the release fork pivot ball, not the pressure plate: diagnosis and replacement.
Ford F-MAX Maintenance Guide: Service Intervals, Engine and Parts Selection
Ford F-MAX truck maintenance guide: the Ecotorq engine, Euro 6 emissions, service intervals, air brake system checks and how to choose the right parts.
MAN TGX Maintenance Guide: Generations, Engines and Parts Selection
MAN TGX truck maintenance guide: generations, D20 and D26 engines, TipMatic, air brake system, service intervals and choosing the correct spare parts.
DAF XF Maintenance Guide: Generations, Engines and Parts Selection
DAF XF truck maintenance guide: generations from the 95XF to the new XF, MX-11 vs MX-13 engines, air brake care and ordering the right part first time.
Volvo FH Maintenance Guide: Generations, Engines and Parts Selection
Volvo FH truck maintenance guide: generations from the FH12 to today, D11-D13-D16 engines, I-Shift, VEB engine brake and choosing the right spare parts.
Scania R/S Series Maintenance Guide: Generations, Engines and Parts Selection
Scania R/S truck maintenance guide: PGR and Next Generation cabs, DC09/DC13/DC16 engines, Opticruise, retarder, service intervals and parts selection.
Mercedes-Benz Actros Maintenance Guide: Generations, Engines and Parts Selection
Mercedes-Benz Actros truck maintenance guide: MP1-MP5 generations, engine families and emission classes, service intervals, air brakes and parts selection.
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.
Transmission Shift Cylinders: Failure, Replacement & Care
On a truck gearbox, gears that grind, refuse to engage or jump out often trace to a leaking pneumatic shift cylinder, not the transmission: diagnosis and repair.
Engine Valve Train & Adjustment Shim: Faults, Replacement, Care
Power loss, rough idle or falling compression on a truck diesel often comes down to valve clearance and worn valve-train parts: diagnosis, shims, replacement.
Compressor Valve & Unloader: Fault, Replacement & Care Guide
Low air pressure on a truck, or a compressor that never cuts out, usually means worn intake and discharge reed valves or a stuck unloader: how to fix it.
Compressor Crankshaft & Drive Assembly: Failure & Replacement Guide
Diagnose, replace, and maintain the air compressor crankshaft and drive assembly on heavy commercial vehicles: fault symptoms, torque values, and service tips.
Pressure Limiting Valve: Faults, Replacement & Maintenance
On a truck, a slow-releasing parking brake or overworked suspension bellows often means a drifted pressure limiting valve: set-pressure check and replacement.
Four-Circuit Protection Valve: Faults, Diagnosis & Replacement
A truck losing air with no leak in sight often has a four-circuit protection valve isolating a burst line: how it prioritises brakes, diagnosis, replacement.
ALB Load Sensing Valve: Faults, Replacement & Setting Guide
Rear axles locking when the truck runs empty, or longer stopping distances when loaded, point to the ALB load-sensing valve: diagnosis and setting.
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.
