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Service bulletin WTC-64

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10139507
Published by NHTSA2018-06-04
Manufacturer's numberWTC-64
Manufacturer's date2016-05-19
NHTSA componentSERVICE BRAKES

NHTSA's summary

The brake fluid used during the production of the potentially affected vehicles may have contained excess moisture. Excess moisture in brake fluid may cause a gelatinous material to form in the brake system. This material may accumulate and temporarily clog stability control-related valve filter(s) in the Vehicle Dynamics Control (VDC) system. In this situation, VDC performance may not fully comply with the FMVSS No.126 requirement. However, the brakes will continue to operate normally.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes

Vehicles listed
SUBARU LEGACY2015
SUBARU OUTBACK2015

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20223952022-07-21. Brakes

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
06-90-242024-07-01. Service bulletin. This bulletin provides diagnosis and procedure information to be applied when diagnosing potential fluid leaks on front and rear brake calipers. This information has been developed to reduce unnecessary brake caliper replacement.
06-87-22R2023-07-03. Service bulletin. "In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the electronic connector lock tab for the Electric Parking Brake (EPB) assembly used in the listed models."
06-87-22R2022-12-01. Service bulletin. In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is extending the New Car Limited Warranty coverage for the electronic connector lock tab for the Electric Parking Brake (EPB) assembly used in the above listed models and model years from (3) years or thirty-six thousand (36,000) miles (whichever comes first) to (15) years / unlimited mileage.
Subarunet Announ2022-12-01. Service bulletin. In the interest of customer satisfaction, Subaru of America, Inc. (SOA) is announcing an extension to the Basic New Car Limited Warranty for the Electronic Parking Brake (EPB) connector lock tab for certain 2015-2018MY Legacy, Outback & WRX models equipped with automatic transmissions.
16-112-18R2021-11-02. Service bulletin. This bulletin announces a design change to the CVT select lever (shifter) mechanism in response to isolated customer concerns of not being able to remove the key from the ignition switch when the vehicle is in Park.
Subarunet Announ2021-11-02. Service bulletin. (Subaru Retailers) As part of Subaru’s dedication to customer satisfaction, Subaru of America, Inc. (SOA) is announcing an extension to the Basic New Car Limited Warranty for the CVT Parking Switch for certain 2015-2018 MY Legacy, Outback, 2012-2018 MY Impreza, 2013-2018 MY Crosstrek, 2015-2018 MY WRX and 2014-2018MY Forester vehicles.
Subarunet Announ2021-11-02. Service bulletin. (Owner Letter) As part of Subaru of America’s dedication to customer satisfaction, this letter is to inform you of an extension to the Basic New Car Limited Warranty for your vehicle’s CVT Parking Brake Switch.
WTB-63R2021-02-18. Service bulletin. Subaru of America, Inc. (Subaru) is initiating a service campaign for all 2015 model year Legacy and Outback vehicles. Subaru has determined that vehicles affected by this Service Program require reprogramming of the Electronic Parking Brake (EPB) system.
06-59-17R2021-02-18. Service bulletin. This Service Information bulletin announces availability of a new front brake pad shim kit to specifically address customer concerns of a squeaking or squealing sound on the models listed above.
WTB-63R2020-11-05. Service bulletin. Subaru of America, Inc. (Subaru) is initiating a service campaign for all 2015 model year Legacy and Outback vehicles. Subaru has determined that vehicles affected by this Service Program require reprogramming of the Electronic Parking Brake (EPB) system.