Compressor Valve & Unloader: Fault, Replacement & Care Guide
Diagnose and fix heavy commercial vehicle compressor valve & unloader faults: symptoms, fill-time testing, replacement steps, torque values and maintenance tips.
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Recent Posts
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
Diagnose, replace and maintain the pressure limiting valve (Druckbegrenzungsventil) on heavy commercial vehicle air systems. Set pressures, torque, faults and FAQs.
Four-Circuit Protection Valve: Faults, Diagnosis & Replacement
Four-circuit protection (distributor) valve on heavy trucks: how it works, fault symptoms, per-circuit gauge diagnosis, replacement steps, torque values and maintenance.
ALB Load Sensing Valve: Faults, Replacement & Setting Guide
Complete technical guide to the ALB load sensing valve on trucks and trailers: how it works, fault symptoms, diagnosis, replacement steps, adjustment and maintenance.
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.
Truck Oil Pan Group: Faults, Replacement & Maintenance Guide
Heavy-duty truck oil pan guide: leak diagnosis, gasket and drain plug faults, step-by-step replacement, torque values, capacities and maintenance tips.
Bendix Cross Reference: VADEN Equivalent Part Numbers
BENDIX cross reference chart: the 48 most-searched BENDIX part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
DOT Air Brake Inspection Checklist: Pass CVSA Brake Safety Week 2026
DOT air brake inspection checklist for CVSA Brake Safety Week 2026 (Aug 23–29): leak test values, pushrod stroke, drum & rotor focus area, and the most common brake violations.
WABCO Cross Reference: VADEN Equivalent Part Numbers
WABCO cross reference chart: the 290 most-searched WABCO part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
KNORR-BREMSE Cross Reference: VADEN Equivalent Part Numbers
KNORR-BREMSE cross reference chart: the 283 most-searched KNORR-BREMSE part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
MERCEDES BENZ Cross Reference: VADEN Equivalent Part Numbers
MERCEDES-BENZ cross reference chart: the 280 most-searched MERCEDES-BENZ part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
MAN Cross Reference: VADEN Equivalent Part Numbers
MAN cross reference chart: the 282 most-searched MAN part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
DAF Cross Reference: VADEN Equivalent Part Numbers
DAF cross reference chart: the 288 most-searched DAF part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
VOLVO Cross Reference: VADEN Equivalent Part Numbers
VOLVO cross reference chart: the 274 most-searched VOLVO part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
SCANIA Cross Reference: VADEN Equivalent Part Numbers
SCANIA cross reference chart: the 282 most-searched SCANIA part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
IVECO Cross Reference: VADEN Equivalent Part Numbers
IVECO cross reference chart: the 284 most-searched IVECO part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
HALDEX Cross Reference: VADEN Equivalent Part Numbers
HALDEX cross reference chart: the 7 most-searched HALDEX part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
MERITOR Cross Reference: VADEN Equivalent Part Numbers
MERITOR cross reference chart: the 269 most-searched MERITOR part numbers matched to VADEN ORIGINAL equivalents — compressors, valves, air dryer and caliper parts.
Brake Caliper Overhaul Kit: Guide Pins, Boots & Adjuster
Truck brake caliper overhaul: guide pin seizure, torn boots and locked adjusters — symptoms, diagnosis, fitting steps, torque values and kit selection.
Truck Air Compressor Overhaul Kit: Head, Valve Plate, Gasket
Compressor overhaul guide for heavy trucks: when to renew the cylinder head, valve plate and gaskets, fault diagnosis, torque values and fitting steps.
Exhaust / Engine Brake: Faults, Replacement & Maintenance Guide
Diagnose, replace and maintain the heavy truck exhaust/engine brake (cylinder, flap, valve). Symptoms, torque values, back-pressure and step-by-step fixes.
