Raybestos Brake Master Cylinder (Raybestos) – Hydraulic Component (2020)
Insufficient crimping can cause brake master cylinder failure.
This AI-generated summary is provided for general informational purposes only and is derived from publicly available recall notices. It supplements but does not replace official agency classifications or safety instructions.
Check Your Product
According to the National Highway Traffic Safety Administration (NHTSA)
Product
RAYBESTOS BRAKE MASTER CYLINDER
Brand
RAYBESTOS
Lot Codes / Batch Numbers
Not specified in NHTSA notice. Check official source for details.
Brake Parts Inc. is recalling certain RAYBESTOS BRAKE MASTER CYLINDER equipment due to service brakes, hydraulic:foundation components:master cylinder issues. If the piston pops out of the master cylinder housing, a complete loss of braking or unintended brake application can occur, increasing the risk of a .
Summary derived from NHTSA notice
Reason for Recall
As stated by NHTSA
Brake Parts, Inc. (Brake Parts) is recalling certain brake master cylinders sold under Raybestos, NAPA, and AC Delco brands, part numbers MC391232, M4840, and 18M2578, respectively sold as aftermarket replacement parts for 2012-2017 Volkswagen Beetle, 2005-2018 Volkswagen Jetta and 2007-2010 Volkswagen Jetta GLI. The crimping of the aluminum housing may be insufficient, allowing the master cylinder piston to pop out of the housing.
Reported concern (NHTSA)
If the piston pops out of the master cylinder housing, a complete loss of braking or unintended brake application can occur, increasing the risk of a crash. Owners may initially notice brake fluid leaking onto the vacuum booster, or a change in brake pedal travel and feel.
Recommended Action
Per NHTSA guidance
Brake Parts will notify the distributors that sold this product, and provide a replacement part, free of charge. The recall began August 13, 2020. Owners may contact NAPA customer service, at 1-800-272-5372; ACDelco: GM customer service at 1-815-759-7328; or Raybestos customer service at 1-800-323-0354.
Verify this information on the official source
For complete details and official instructions, check the National Highway Traffic Safety Administration (NHTSA) directly.
View official NHTSA recall noticePage updated: Jan 10, 2026