# Service bulletin SS3083\-FTL2021

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10203755
- Published by NHTSA: 2021\-12\-02
- Manufacturer's number: SS3083\-FTL2021
- Manufacturer's date: 2021\-11\-23
- NHTSA component: SUSPENSION

## NHTSA's summary

Service Solution for Aero Height Control Interfering with RDF Alignment. The Aerodynamic Height Control feature on the New Cascadia is a feature that raises and lowers the air suspension with relation to vehicle speed in order to reduce drag and achieve better fuel efficiency. The Hadley Smart Valve \(HSV\) is the module that makes this possible by applying and exhausting air from the rear axle suspension as necessary.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203755-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10203755-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Suspension

## Vehicles listed

- 2017 to 2022 FREIGHTLINER CASCADIA
- 2021 to 2022 WESTERN STAR 49X

## Recalls for the same vehicles and component

- [20V660000](/recalls/nhtsa/20V660000.md), 2020-10-27: SUSPENSION:REAR:AXLE:SPINDLE
- [18V913000](/recalls/nhtsa/18V913000.md), 2018-12-19: SUSPENSION:FRONT:CONTROL ARM; STEERING:LINKAGES:TIE ROD ASSEMBLY; STEERING

## Other bulletins for the same vehicles and component

- [FleetCom\_Frnt Susp Bush](/bulletins/11029633.md), 2026-03-05, Other: SUSPENSION. Fleet Communications for composite front suspension bushing
- [FleetCom\_Frnt Susp Spring](/bulletins/11027491.md), 2026-01-08, Other: SUSPENSION. Fleet Communications for Cascadia Front Suspension Spring Pin Bushings
- [CXA 10\_25\_Front Shock](/bulletins/11025096.md), 2025-11-06, Other: SUSPENSION. CX Advocate for 18k Front Suspension Shock Absorbers
- [CXA\_10\_25\_TufTrac M12](/bulletins/11024969.md), 2025-11-05, Other: SUSPENSION. CX Advocate for TufTrac M12 Bolts \(TSB\-32\-057\-FTL\)
- [TSB32\-057\-FTL](/bulletins/11023690.md), 2025-10-03, Service bulletin: SUSPENSION. Technical Service Bulletin for TufTrac M12 Bolts
- [SF721\-OWN LTR](/bulletins/11023686.md), 2025-10-03, Service campaign: SUSPENSION. Field Service Campaign for SF721 18k Front Suspension Shock Absorbers
- [SF721\-DLR LTR](/bulletins/11023685.md), 2025-10-03, Service campaign: SUSPENSION. Field Service Campaign for SF721 18k Front Suspension Shock Absorbers
- [SF721\-Bulletin](/bulletins/11023684.md), 2025-10-03, Service campaign: SUSPENSION. Field Service Campaign for SF721 18k Front Suspension Shock Absorbers
- [SB32\-056](/bulletins/10208388.md), 2022-03-03, Service bulletin: SUSPENSION. Freightliner Service Bulletin for Front Spring Eye Bushing Replacement
- [MYCOM\_032521\-2](/bulletins/10200687.md), 2021-08-30, Service bulletin: SUSPENSION. Cascadia Rear Suspension Ride Height Update In an effort to clearly identify the AirLiner rear suspension ride height, and to align with future suspension offerings, the ride height data codes \(see module 621\) changed in SpecPro as of 3/11/21 for Cascadia models. This change does not affect the ride height of your spec, it clarifies the ride height within the data code. For example, if a customer uses a 40,000\# AirLiner suspension today with the 621\-007\(AirLiner High Position Ride Height\) that spec will be updated to use 621\-118 \(7.9" nominal ride height\).

JSON: [/v1/bulletins/10203755](/v1/bulletins/10203755)

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