This Bendix AD-IP air dryer service data document (SD-08-2414) provides complete technical information for the Bendix® AD-IP™ Integral Purge Air Dryer. It covers system description, charge and purge cycle operation, preventative maintenance testing, rebuilding procedures, retrofit instructions, and a detailed troubleshooting chart across 28 pages.
Official Bendix AD-IP air dryer document details
| Brand | Bendix Commercial Vehicle Systems LLC |
| Model coverage | AD-IP™ Integral Purge Air Dryer; AD-IP™ DI (Drop In) model for Holset compressors |
| System / Group | Air Brakes — Air Dryer |
| Publication no. | SD-08-2414 |
| Year / Revision | 5/2007 (BW1811) |
| Pages | 28 |
| File size | 1.5 MB |
| Format | |
| Language | English |
Document table of contents
- Description — AD-IP™ Integral Purge Air Dryer overview, port identification (CON 4, SUP 11, DEL 2)
- AD-IP™ DI “Drop In” Air Dryer Model — specialized version for Holset (Cummins) Type E and QE compressors with integrated feedback line and check valve
- Operation — Charge Cycle and Purge Cycle, desiccant adsorption process, delivery check valve variants (vertical vs. horizontal)
- Thermostat and Heater Operation — resistance testing for 12V (1.5–3.0 ohms) and 24V (6.0–9.0 ohms) heater assemblies
- Rebuilding the AD-IP™ Air Dryer — component replacement using genuine Bendix® parts and service kits
- AD-IP™ Air Dryer Removal and Installation — mounting bracket torque specs (60–100 in. lbs.), airline reconnection, wiring harness procedures
- Retrofitting the AD-IP™ Air Dryer — reference instructions for aftermarket retrofit and replacement
- Operation and Leakage Tests — supply system pressure drop limits (1 psi per minute), service and park system leakage checks (2 psi in 2 minutes for truck, bus, tractor)
- AD-IP™ Air Dryer Troubleshooting Chart — symptoms including excessive leakage, failure to purge, slow pressure build-up, discharge line leakage, and purge valve diagnostics
Applicable truck models
This service data applies to commercial vehicles equipped with the Bendix AD-IP™ or AD-IP™ DI integral purge air dryer. The DI variant is specifically designed for air systems using Holset (Cummins) Type E or QE air compressors, which require feedback pressure in the discharge line during the unloaded cycle. The document is relevant to trucks, buses, and tractors with air brake systems utilizing these dryer configurations. For additional product information, visit the Bendix Commercial Vehicle Systems website.
Who needs this Bendix AD-IP air dryer manual
Fleet maintenance technicians, independent mechanics, and workshop owners servicing commercial vehicle air brake systems will find this manual essential. It provides the testing specifications, rebuild procedures, and troubleshooting steps needed to diagnose and repair AD-IP™ air dryer issues without removing the unit from the vehicle.
The full 28-page PDF is available in the DiagTechPro manuals library, free account required to download.
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