OVERVIEW
Genuine VW/Audi M8 self-locking collared hex nut, part number N-023-003-13. This original fastener provides an integral bearing collar and a self-locking threaded connection. The confirmed applications below assign it to the brake-booster mounting assembly on Volkswagen Touareg models.
Technical details
- Original part number: N-023-003-13 / N02300313.
- Nominal thread designation: M8.
- Self-locking hexagonal collar nut, supplied individually.
- Integral collar bears against the designated mounting surface. Match the original factory nut assignment rather than choosing solely by thread diameter.
- Brake booster, mounting studs, seals and companion hardware are not included.
- The standard part number is used in multiple assemblies; this listing's table identifies the confirmed booster applications.
Common reasons to replace
Replace hardware with damaged threads, rounded hex flats, significant corrosion or a locking feature that no longer provides the specified retention. New nuts may be required when a booster is removed or replaced under the vehicle's prescribed repair procedure.
Loose mounting hardware requires inspection of the complete joint, including studs, mounting surfaces and the booster support. A new nut cannot repair damaged studs or a distorted support. Hard pedal effort, vacuum loss and braking faults also require diagnosis of the relevant system rather than assuming this fastener is the cause.
Installation and service notes
Confirm the exact booster assembly and mounting position against the vehicle's equipment configuration. Inspect the receiving stud and bearing surface, support the assembly correctly and start the nut by hand. Follow the factory tightening sequence, torque specification and replacement requirements for self-locking hardware.
Do not add lubricant or change the hardware arrangement unless the repair procedure specifies it. Complete all required brake-system checks after service. If the repair involves hydraulic connections, follow the applicable bleeding and functional-test procedure.
Fitment
| Vehicle | Model years | Engine | Assembly and restrictions |
|---|---|---|---|
| Volkswagen Touareg | 2011 | 3.6L VR6 gasoline | 7P; VR6; brake-booster mounting. Match factory booster mounting position and equipment-specific hardware assignment; catalog includes adaptive-cruise-control applications. |
| Volkswagen Touareg | 2012 | 3.0L V6 TDI diesel | 7P; TDI Lux; brake-booster mounting. Match factory booster mounting position and equipment-specific hardware assignment; catalog includes adaptive-cruise-control applications. |
| Volkswagen Touareg | 2013 | 3.0L V6 TDI diesel | 7P; TDI Lux; brake-booster mounting. Match factory booster mounting position and equipment-specific hardware assignment; catalog includes adaptive-cruise-control applications. |
| Volkswagen Touareg | 2015 | 3.0L V6 TDI diesel | 7P; TDI Lux; brake-booster mounting. Match factory booster mounting position and equipment-specific hardware assignment; catalog includes adaptive-cruise-control applications. |
| Volkswagen Touareg | 2016 | 3.6L VR6 gasoline | 7P; V6 Lux; brake-booster mounting. Match factory booster mounting position and equipment-specific hardware assignment; catalog includes adaptive-cruise-control applications. |
Confirm the original nut, brake-booster arrangement and equipment-specific mounting assignment before ordering.