Truck Radiator & Expansion Tank: Faults, Replacement & Care
Diagnose radiator and expansion tank faults on heavy trucks: overheating, coolant loss, pressure caps, correct replacement steps and safe technical values.
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
Engine Coolant Thermostat: Faults, Replacement & Care
Heavy truck engine coolant thermostat guide: stuck-open vs stuck-closed faults, diagnosis, correct replacement, torque values and maintenance tips.
Truck Retarder: Faults, Replacement & Maintenance Guide
Complete VADEN guide to heavy truck retarders: how hydraulic and electromagnetic types work, fault diagnosis, replacement steps, torque values and maintenance.
Diesel Injection Pump: Faults, Replacement & Maintenance
Diesel injection pump guide for heavy trucks and buses: fault symptoms, diagnosis, replacement steps, torque and pressure values, and maintenance tips.
Exhaust Manifold: Cracks, Leaks, Replacement & Torque Guide
Spot exhaust manifold cracks, gasket leaks and broken studs on heavy trucks. Learn diagnosis, correct replacement steps, torque values and tightening sequence.
ECAS Solenoid Valve: Faults, Replacement & Maintenance Guide
A truck sitting low on one side or a trailer that will not settle to ride height points to the ECAS solenoid valve block: diagnosis, replacement and calibration.
Fuel Filter & Water Separator: Faults, Change and Care Guide
Power loss under load on a truck, or water reaching common-rail injectors, starts at the fuel filter and water separator: diagnosis, bleeding, replacement.
Hydraulic Steering Pump: Failure, Replacement & Care Guide
Whining at the wheel and heavy steering at manoeuvring speed in a truck usually trace to the hydraulic steering pump: diagnosis, replacement, fluid care.
Viscous Fan Clutch: Fault, Replacement & Maintenance Guide
Heavy-duty viscous fan clutch guide: how it works, fault symptoms, diagnosis, correct replacement steps and safe technical values for trucks and buses.
Exhaust Flex Pipe: Faults, Replacement and Maintenance Guide
On a truck a collapsed exhaust flex pipe strains the whole line from turbo to DPF: how the bellows absorbs engine movement, fault signs and replacement.
ABS Wheel Speed Sensor & ECU: Faults, Replacement & Care
Diagnose, replace and maintain the ABS wheel speed sensor, tone ring and ECU on heavy commercial vehicles: symptoms, air gap, testing and fault codes.
How to Read an Air Brake Diagram: Circuit Guide
How do you read an air brake system diagram? Symbol language, line colours, port codes, circuit split, trailer lines and fault-tracing, step by step.
Air Brake Chamber Explained: Types, Sizes, Failure Symptoms & Replacement
Truck and trailer inspection reports rarely say the brake chamber is defective; they report brake force imbalance. Chamber types, sizes, symptoms and replacement.
Heavy-Duty Truck Air Dryer: Bendix, WABCO & When to Replace the Cartridge
Identify your truck's air dryer family, Bendix or WABCO, and learn the signs and timing for replacing the desiccant cartridge.
Truck Air Compressor by Engine & Make: DD15, Cummins, PACCAR, Mack & More
Find where the air compressor sits on DD15, Cummins, PACCAR and Mack engines, and how engine family and chassis layout change the job.
Air Brake System: How It Works on Heavy Commercial Vehicles
Learn how the air brake system works on heavy commercial vehicles, why brakes can apply late despite full force, and how to diagnose the delay.
Truck Air Brake Valves Explained: Types, Functions and Failure Symptoms
Truck air brake valves explained: what relay, ALB, foot brake and trailer valves do, their failure symptoms, and how to diagnose faults with a pressure gauge set.
What Is Brake Fade? Long-Descent Braking Strategy
What causes brake fade, and how do you use the engine brake, exhaust brake, and retarder on a long descent? A heat management guide for heavy trucks.
What Is a Fuel Injector? How to Recognize Injector Failure Symptoms
What is a fuel injector and how does it work? Injector failure symptoms, leak-off testing, cleaning, replacement, and IMA/ISA coding for heavy-duty trucks.
What Is AdBlue? What Happens When It Runs Out?
What is AdBlue, how does it work in the SCR system, and what happens when a heavy commercial vehicle runs out? Warning stages, consumption and diagnosis.
What Is an EGR Valve? Failure Symptoms and Cleaning (Heavy Commercial Vehicles)
What is an EGR valve? How it works, why it clogs, failure symptoms, diagnosis steps, and cleaning limits for heavy commercial vehicles.
Water Separator Filter: Diesel Water Drain & Warning
Where does water get into diesel fuel, how does a water separator work, and what should you do when the warning light comes on? A heavy-duty vehicle guide.
Burnt Cylinder Head Gasket: Symptoms and Causes
Symptoms, leak paths and root causes of a burnt heavy-duty head gasket, plus pressure testing, block testing, torque procedure and replacement steps.
Choosing Truck Brake Components
A practical guide to choosing the right aftermarket brake components for trucks, tractor units and trailers: verification, approvals, suppliers and cost.
