DAF 85CF Trailer Lifter Trunk Lifting Control Valve Pump Unit 1259855

The DAF 85CF Trailer Axle Lift Control Bypass Valve is a used, original valve unit with integrated pump, designed for the axle lift system on DAF trucks with the XF315M engine. It's a practical solution for workshops and fleets that need a proven hydraulic component to restore the axle lift system to its proper operation.

Specifications and technical data

• SKU: 1259855
• Mark: DAF
• Condition: Used
• OEM Part Number: 1259855
• Substitutable numbers: 1259855
• Category: Air Bypass Valves

Purpose and function in the vehicle

This bypass valve and pump unit controls the lifting and lowering of the trailer axles in a DAF 85CF with an XF315M engine. A properly functioning valve ensures stable pressure control in the system, which translates into safe axle load distribution and proper vehicle performance under various operating conditions.

The component comes from a vehicle with 95 miles, which means it has a limited service life compared to many typical aftermarket units. This makes the valve an attractive alternative to new parts, especially for service applications and fleet maintenance costs optimization.

Construction and technical characteristics

The bypass valve unit integrated with the pump creates a compact hydraulic module that simplifies installation in the vehicle. Using the original DAF solution allows the factory performance characteristics of the axle lift system to be maintained without the need for any modifications to the installation.

• Original DAF design – adapted to the vehicle's hydraulic and pneumatic systems.
• Modular design – bypass valve combined with pump in one unit, which facilitates service replacement.
• Adapted to the XF315M engine – compatible with the system configuration in the 85CF model.

This type of bypass valve is a key element of the lifting axle control system, therefore its efficiency has a direct impact on the durability of the suspension, tires and driving comfort of the set.

Condition, origin and service use

The part is in used condition, allowing for a reasonable purchase price while maintaining the original manufacturer's specifications. For workshops specializing in DAF trucks and fleet users, this means the ability to quickly replace a damaged module without requiring extended vehicle downtime.

The unit will be especially useful in situations where:

• the trailer axle lifting system reacts with delay or is unstable,
• there are problems with maintaining the correct level of the lifting axle,
• an economical repair is necessary while maintaining the original DAF design.

Benefits of using the original DAF bypass valve

Choosing an original bypass valve with pump for the DAF 85CF with XF315M engine ensures the integrity of the entire hydraulic system and maintains the manufacturer's specifications. This is particularly important in vehicles operating under heavy loads, where stable lift axle control impacts safety and operating economy.

By using an original module, you minimize the risk of compatibility problems, leaks or incorrect valve performance characteristics, which are typical of substitutes of uncertain origin.

Related Categories and Technical Knowledge

If you're looking for other bypass valves for DAF vehicles, check out our dedicated category: DAF Bypass Valves . There you'll find a wide selection of hydraulic and control system components tailored to various DAF models.

When selecting used control system components, it's important to understand the operating principles of modern systems in truck engines. We encourage you to read our article, EGR: What Is It and Why You Should Consider Used EGR Valves , which will help you better understand the specifics of valve operation in exhaust systems and the importance of making an informed choice of used parts.

Summary

The DAF 85CF Trailer Axle Lift Control Bypass Valve with Integrated Pump is a practical, used service solution for vehicles with the XF315M engine. Its original DAF design, modular construction, and compatibility with the factory axle lift system make it a functional choice for workshops and fleet operators who want a proven component while maintaining control over repair costs.