Precision Remanufacturing for Detroit Diesel Platforms
The Turbo Kings-rebuilt S4324711010 Air Dryer restores the full performance of the original Knorr-Bremse air management unit used on Detroit Diesel DD15 / DD13 engines (2010–2014). These units are carefully disassembled, hot-alkaline cleaned, and rebuilt using OEM-grade components to ensure long-term reliability in demanding fleet environments.
This integrated assembly—commonly referred to as the DD15 APU (Air Processing Unit)—manages both moisture removal and circuit protection for the truck’s entire pneumatic system. Turbo Kings’ rebuild process revitalizes each valve, seal, and desiccant core to exceed the original service-life expectations.
Precision Remanufacturing and Testing Standards
Each Knorr-Bremse housing undergoes ultrasonic cleaning and media blasting to remove carbon buildup and oil residue without compromising machined surfaces. All threaded ports and mating faces are inspected and restored to exact sealing depth tolerances.
OEM-Grade Internal Valves: Replaced and calibrated to restore correct pressure sequencing.
New Purge Valve Assembly: Factory-tested for leak-free purge cycles and rapid recovery.
Repacked Desiccant Cartridge: Filled with fresh, high-absorption media and sealed for moisture resistance.
12V Heating Element Tested: Ensures reliable operation and freeze protection under winter duty.
Pressure-Relief & Check Valves: Calibrated and verified to meet 120–150 PSI operating range.
Each completed assembly is hydraulically sealed, function-tested, and electronically verified for heater continuity and purge timing accuracy before leaving Turbo Kings’ facility.
What Makes a Turbo Kings Rebuild Different
Turbo Kings applies the same process discipline used in heavy-duty turbocharger and gearbox rebuilding to every air dryer unit. Rather than a basic reseal, each dryer undergoes complete component replacement and performance validation under load.
No shortcuts—each purge valve, circuit piston, and sealing ring is replaced.
Pressure testing ensures leak-free operation across all four circuits.
Electrical heater and check valves are tested under live voltage.
Final purge duration and pressure drop are recorded for quality traceability.
The result is a remanufactured air dryer that performs like new—delivering consistent moisture removal, balanced air distribution, and extended service intervals across the air-brake system.
Our Process at a Glance
Full Disassembly & Aqueous Alkaline Cleaning
Ultrasonic & Media Surface Prep
Valve, Seal, and O-Ring Replacement
Electrical Heater Test & Continuity Verification
Pressure Testing (120–150 PSI)
Final Purge Cycle & Leak Inspection
Specifications
Operating Pressure: 120–150 PSI
Voltage: 12 V Heater
OEM: Knorr-Bremse
Rebuilder: Turbo Kings
Compatible Models: DD13 / DD15 / DD16 (2010–2014)
Core Charge: Applies (Rebuildable Core Required)
Warranty: 6 Months / Unlimited Mileage
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