Audi

Complete Overhaul of Front KYB-DRC Shock Absorber

✔ Complete overhaul of the DRC force control system to restore optimal performance
✔ Re-gasification for full functionality
✔ New H-MBR oil seals for enhanced durability and reliability
✔ New bushings for stability and smooth operation
✔ New guide for precise functionality
✔ Pre- and post-repair testing on a dynamometer
✔ Performance graphs before and after the repair

🔧 Result:
The repaired shock absorber is restored to brand-new original condition, ensuring all OEM technological qualities, including comfort, stiffness, durability, and performance.

⚠ Why Original Matters:
The precision and performance of original shock absorbers cannot be replicated by aftermarket Chinese substitutes, replicas, or copies. Only original components can be repaired to meet OEM standards.

Complete Overhaul of Rear KYB-DRC Shock Absorber

✔ Complete overhaul of the DRC force control system to restore optimal performance
✔ Re-gasification for full functionality
✔ New H-MBR oil seals for enhanced durability and reliability
✔ New bushings for stability and smooth operation
✔ New guide for precise functionality
✔ Pre- and post-repair testing on a dynamometer
✔ Performance graphs before and after the repair

🔧 Result:
The repaired shock absorber is restored to brand-new original condition, ensuring all OEM technological qualities, including comfort, stiffness, durability, and performance.

⚠ Why Original Matters:
The precision and performance of original shock absorbers cannot be replicated by aftermarket Chinese substitutes, replicas, or copies. Only original components can be repaired to meet OEM standards.

Audi DRC Central Valve Repair

We offer professional repair and full restoration of Audi Dynamic Ride Control (DRC) central valves for RS models such as RS4, RS5, RS6 and RS7.

The central valve is the heart of the DRC system. It compensates volume changes between diagonally connected dampers and maintains correct hydraulic pressure. When the internal gas pressure drops or the separating seal wears out, typical symptoms appear:

✔ Rear knocking noise
✔ Pressure drop after bleeding
✔ Cavitation inside dampers
✔ Foamy oil contamination
✔ Excessive stiffness or unstable behavior

🔧 What We Do

Our repair process includes:

✔ Complete disassembly
✔ Internal inspection of piston and sealing surfaces
✔ Replacement of worn sealing components
✔ Restoration of proper nitrogen gas chamber
✔ Precise nitrogen charging with controlled pressure
✔ Final pressure testing

✅ Why Our Solution Is Better Than OEM

Unlike the factory unit, after our repair the central valve becomes:

• Serviceable
• Rebuildable
• Adjustable

This means the nitrogen pressure can be checked and adjusted in the future without replacing the entire unit.

Correct gas volume AND pressure are critical to prevent cavitation and knocking. Our solution restores both parameters properly, ensuring long-term durability and stable DRC performance.

⚠ Important

If the gas chamber has been filled with oil due to internal seal failure, simple system bleeding will NOT solve the problem. Proper internal repair is required.

This factory-approved DRC drain and refill procedure is traditionally available only through official Audi dealerships, as it requires original VAS service equipment and specific know-how.

AirTec is now the only independent company in Bulgaria, besides Audi itself, officially capable of performing this service.

The procedure is carried out directly on the vehicle, without removing the shock absorbers, and restores the correct hydraulic fluid volume, pressure balance, and OEM damping characteristics of the DRC system.

✔ Dealer-level VAS procedure
✔ No shock absorber removal required
✔ Original Audi / VAG hydraulic fluid
✔ Audi RS models with DRC system
✔ Exclusively available in Bulgaria only at Audi dealers and AirTec