MAN TGA/TGM/TGS/TGX Quick Release Valve Wabco 4735012030 81521156023 Chassis Horn Valves & Pulls

Description:
This listing is for a used genuine WABCO quick release valve for MAN heavy commercial vehicles. The component is identified on the WABCO plate as part number 4735012030 and cross references to MAN OE 81521156023 / 81.52115-6023, with further MAN equivalents 81521156022 and 81521156026. Catalogues from WABCO and MAN describe this unit as a multi-way quick release valve used in the air brake and suspension system on MAN TGA, TGM, TGS and TGX models, including ECAS (electronically controlled air suspension) applications.

The valve body is a compact cast alloy housing with three M22 x 1.5 ports and a black plastic silencer on the exhaust port. It is chassis mounted and is designed to rapidly vent air from the brake or suspension circuits, improving response time and system stability. Typical operating pressure is up to 10 bar as stated in WABCO and aftermarket technical data.

Compatibility (confirmed by cross-reference data):
- MAN TGA (various axle configurations, air brake systems)
- MAN TGM (1st generation)
- MAN TGS (1st generation)
- MAN TGX (1st generation)
Service information and cross‑reference catalogues state usage on MAN trucks from approximately 1986 onwards with Euro 4, Euro 5 and early Euro 6 engines, depending on chassis and brake configuration. It also crosses to several other manufacturers (DAF, Iveco, Irisbus, Neoplan, Scania, Steyr, Tatra) under the same WABCO 4735012030 valve design, although this particular unit was removed from a MAN application.

Technical features:
- Brand: WABCO (OEM quality air brake manufacturer)
- Type: Quick release valve / multi‑way air brake valve
- WABCO PN: 473 501 203 0
- MAN OE: 81521156023 / 81.52115-6023 (also 81521156022, 81521156026)
- Thread size: M22 x 1.5 ports (air connections and exhaust)
- Operating pressure: up to approx. 10 bar
- Construction: cast alloy body with plastic silencer and steel/brass fittings
- Application: chassis air brake / air suspension system quick exhaust
- Approximate weight: 0.7 kg
- Country of manufacture: Germany (WABCO air brake components for this range are produced in Germany according to catalogues).

Condition:
This is a used, fully functional valve graded as condition B. The unit was checked for correct operation on the vehicle prior to removal, with no notable leakage detected. Externally it shows cosmetic wear consistent with age and mileage, including grime, oxidation and paint loss on the casting and fittings. Mounting ears are intact and threads appear serviceable. Internal seals have not been renewed, so for critical applications professional inspection or overhaul is recommended. Supplied exactly as shown in the photos with used elbow fittings and plastic silencer; no additional pipes, brackets or sensors are included.

Installation notes:
Professional installation by a technician familiar with commercial vehicle air brake systems is strongly recommended. After fitting, the entire air system should be pressure‑tested and checked for leaks. On vehicles with ECAS or advanced brake control, no electronic coding is normally required for this purely pneumatic valve, but follow MAN workshop procedures for system bleeding and functional checks.

Warranty & returns:
The part comes with a 3‑month warranty covering correct operation under normal commercial vehicle use. It was tested on the truck before dismantling and inspected again prior to dispatch. Returns are accepted within 30 days if the item is returned in the same condition; please confirm the part number and compatibility with your MAN dealer or workshop before ordering.

Shipping & Returns:
We ship across UK/EU with tracked services. Returns accepted within 30 days; buyer pays return postage. Please inspect upon arrival and message us with any concerns.

Why Buy From Us:
Genuine part, 3-month warranty, fast dispatch, secure packaging.