MAN TGL/TGM/TGS/TGX Relay Brake Valve 81521166090 81.52116-6090 Chassis Euro 5/6

Description:
This listing is for a used genuine WABCO air brake relay valve for MAN heavy commercial vehicles. The part is identified as WABCO 9730030120 with MAN OE reference 81521166090 / 81.52116-6090, commonly used as a chassis-mounted relay brake valve in the service brake circuit. According to WABCO and MAN parts data, this valve is fitted to MAN TGL, TGM, TGS and TGX trucks from approximately 2005–2021 and is also cross‑listed for certain DAF LF45, LF55, CF65, CF75 and CF85 models where MAN/WABCO running gear is used.

Functionally, the relay valve amplifies brake pedal control air pressure and rapidly applies or releases air to the brake chambers on the relevant axle group, improving response time of the service brakes. The WABCO 9730030120 design is an OE-spec pressure‑reduction relay valve with maximum operating pressure around 15 bar, M22 x 1.5 threaded ports and four M8 mounting points, as confirmed in WABCO technical documentation. It is built with a robust cast metal body and a plastic adjustment cap.

The unit offered here was removed from a tested vehicle. The braking system was checked on the truck before disassembly and this relay valve functioned correctly with no obvious leaks or sticking. After removal the part was visually inspected and externally cleaned; no cracks, broken flanges or damaged ports were found, only normal surface corrosion and dirt consistent with age and mileage. Some hoses and fittings remain attached and are included free of charge; we recommend reusing only if they pass your workshop inspection.

This valve is suitable as a direct replacement for the listed MAN and WABCO part numbers where your existing unit carries 81521166090 / 81.52116-6090 or 9730030120. Always compare the numbers and port layout with your old valve and consult your parts catalogue or MAN dealer if unsure. Professional installation by a commercial vehicle workshop is strongly recommended, with all sealing rings, hoses and connections checked for leaks after fitting. No coding or electronic programming is typically required, but the air brake system must be tested for correct operation and compliance with local regulations.

The item is graded as B – used but fully serviceable with cosmetic wear. It is an ideal cost‑effective OE replacement compared to the price of a new relay valve.

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