Description

Overview

The BPW 30K Air Spring from Sampa is a complete air suspension assembly with a rubber bellows and plastic lower piston for selected BPW trailer suspensions. It replaces the BPW 0542943220 configuration used on compatible O, AL and SL suspension systems.

This KP01 variant has a maximum outside diameter of 278mm and a specified height of 360mm. Its plastic piston and mounting configuration distinguish it from other 940-family air springs, including versions supplied with different pistons or mounting hardware.

Features

• Complete rubber bellows and plastic piston assembly.
• 278mm maximum outside diameter and 360mm specified height.
• Suitable for selected BPW O, AL and SL trailer suspension systems.
• Single complete assembly for replacement of the existing air spring and piston.

Specifications and Materials

• Manufacturer: Sampa
• Component: Complete air suspension spring
• Application: BPW Type 30K
• Construction: Rubber bellows with plastic piston
• Maximum outside diameter: 278mm
• Specified height: 360mm
• Piston material: Plastic
• Quantity supplied: 1 complete air spring assembly
• Vehicle application: Heavy commercial trailers

Part number: SP55940-KP01.

Explore Sampa’s air spring technical guide for construction and material information.

Compatibility and Fitment

This complete air spring suits compatible BPW Type 30K trailer suspensions, including selected O, AL and SL axle suspension arrangements.

When replacing the existing assembly, compare the piston shape, overall height, upper mounting arrangement and lower piston attachment. Other 940-family air springs can share similar bellows dimensions while using different pistons or mounting configurations.

The following cross-reference numbers identify verified equivalent or replacement parts for this exact application. Confirm the selection-critical fitment details against the part being replaced before fitting.

0542943220, RML7051 CP1, 3940-01 CPP

Related Parts

The following separately available components and related configurations support air spring servicing within the BPW 940 family.

Compliance and Safety

Support the trailer securely and exhaust the air suspension pressure before removing the existing assembly. Inspect the mounting points, piston attachment and air line connection for damage or wear.

After installation, restore air pressure gradually and check for leaks, correct ride height and sufficient clearance throughout suspension movement. Follow the applicable BPW installation and tightening procedures.

Trailer Applications

This assembly supports selected BPW Type 30K air suspension systems on heavy commercial trailers, including semi-trailers, curtainsiders, refrigerated trailers and general freight equipment.

The complete plastic-piston configuration allows replacement of both the rubber bellows and lower piston when the original assembly requires renewal.

Cross-reference and Suitability

This part cross-references to the following verified equivalent or replacement part numbers:

Why Choose ICS Trailers

BPW 30K Air Spring replacement requires careful attention to the piston and mounting arrangement. Several air springs in the 940 family have similar bellows dimensions but different complete assembly configurations. The KP01 version matches the specific plastic-piston arrangement used with the corresponding BPW mounting setup.

ICS Trailers can assist with identifying the correct complete air spring, separate replacement piston or mounting service components for your suspension. Comparing the existing assembly before ordering is particularly important where a trailer has previously undergone suspension repairs.

• Replace the complete plastic-piston assembly when both the bellows and lower piston need attention.
• Send through the existing air spring markings, piston photos or suspension details if you need assistance identifying the correct replacement.

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