Used Truck Air Brake Compressors & Air System Components

Used truck air brake compressors & air system components

In any heavy truck with air brakes, the air compressor is the heart of the system. It is an engine-driven mechanical pump that compresses air from the atmosphere and stores it in air tanks, ready to supply the brake chambers, suspension and auxiliary systems whenever the driver presses the pedal or activates a function. Truck air brake compressors and related air system components are therefore critical for both safety and uptime.

This category brings together used OEM air brake compressors and associated air system parts from late-model European trucks. As we dismantle more vehicles, you will find here engine-mounted air compressors as well as key control components such as air distributor valves, pressure switches and suspension air management modules, all removed from complete donor trucks and listed with OE numbers.

What you will find in the Air Compressors category

Stock in this category changes as new donor vehicles arrive, but it typically includes:

• engine-mounted air brake compressors used to build system pressure for brakes, suspension and auxiliaries;
• air distributor (multi-circuit protection) valves that route compressed air to separate brake circuits;
• air pressure switches and sensors used to monitor system pressure and trigger warnings or cut-in/cut-out functions;
• air suspension and chassis level control units (for example CLCS control modules used on Mercedes trucks);
• other air system components directly related to compressor output and brake air supply.

Each item is listed with clear images of the exact part in stock, along with OE or OEM numbers and basic technical details to help you match it to your truck.

Truck brands & typical applications

Most parts in this category come from mainstream European lorries such as: DAF CF/XF, MAN TGL/TGM/TGS/TGX, Volvo FH/FM, Mercedes-Benz Actros/Arocs and Scania models. We focus on genuine OEM compressors and air system components from brands like WABCO, Knorr-Bremse and other approved suppliers, designed specifically for heavy commercial vehicle use.

Typical reasons to replace an air compressor or related air system part include:

• slow air build-up or low system pressure due to a worn compressor;
• excessive oil carry-over contaminating air tanks and valves;
• air leaks or malfunctions in multi-circuit protection / air distributor valves;
• fault codes and warning lights caused by defective air pressure switches or control units;
• accident damage or engine swaps where the original compressor or air module is missing.

How truck air brake compressors work

On heavy-duty vehicles the air brake compressor is usually driven directly by the engine via gears or a belt. As the engine runs, the compressor draws in ambient air, compresses it to a specified pressure and delivers it to the air tanks. From there the air is distributed via valves and lines to the brake chambers, suspension and auxiliary consumers.

A correctly sized and specified compressor ensures the system can quickly recover pressure after multiple brake applications, while air governors, dryers and tanks work together to control moisture and protect downstream components. Using the right OEM compressor and matching control parts helps maintain performance, reduce downtime and keep the braking system compliant with regulations.

How to choose the correct compressor or air system component

To avoid ordering the wrong part, always check:

• OEM part number on the compressor, valve, switch or control unit;
• truck brand, model, engine type and Euro class (for example MAN TGX Euro 6, Volvo FH4, Mercedes Actros MP4);
• mounting type – flange pattern, gear drive, pulley/belt drive and oil/coolant connections for compressors;
• air output and configuration – single or twin-cylinder compressor, relevant pressure ratings where known;
• electrical and pneumatic connections on valves, pressure switches and control units;
• any additional markings from WABCO, Knorr-Bremse or other suppliers to help confirm compatibility.

If you are unsure which compressor or air system part you need, you can contact us with your VIN or registration number and photos of the existing component and labels. Our team will help you cross-check part numbers and identify a suitable replacement. For general guidance, see How to Find the Right Part and Compatibility & VIN Policy.

Tested used OEM compressors & air system parts

Where possible, we run donor trucks before dismantling to check air build-up times and basic brake operation. During removal, compressors and air system components are inspected for obvious damage, heavy corrosion, broken mounts and damaged connectors. Items that do not meet our standards are rejected; only good used parts are cleaned, labelled and stored under cover in our warehouse.

Because we specialise in used OEM truck parts, you benefit from:

• components designed specifically for heavy-duty air brake and suspension systems;
• correct fitment and interfaces for your engine, chassis and air system layout;
• honest condition descriptions and photos of the exact part supplied.

For more details about how we work, visit our Our Dismantling & Quality Process and Warranty & Part Condition pages.

Related brake & air system categories

If you are rebuilding a larger section of the air brake system, you may also want to browse:

• Air Tanks – storage for compressed air in the brake and suspension circuits;
• Air Dryers – units that remove moisture and protect the air system from corrosion;
• Brake Chambers and Brake Calipers – components that convert air pressure into braking force at the wheels;
• Brake Lines, Hoses & Fittings and Brake Hose Connectors – pipework and hoses carrying compressed air through the system.

We dispatch parts quickly from our UK warehouse with tracked delivery options across the UK and EU. Full details on shipping, payment and returns are available on our Delivery & Shipping, Payment & VAT and Returns & Refunds pages.