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Service bulletin No. 56-21-1

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 id10200877
Published by NHTSA2021-09-02
Manufacturer's numberNo. 56-21-1
Manufacturer's date2021-08-09
NHTSA componentSERVICE BRAKES, HYDRAULIC

NHTSA's summary

Instructions on how to treat a squeaking noise from the front end area when a brake pedal is actuated.

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
PORSCHE TAYCAN2020, 2021

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

Recalls for the same vehicles and component
20243532024-06-19. Brakes
24V4550002024-06-19. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS
23V3470002023-05-16. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL; SERVICE BRAKES, HYDRAULIC
21V6970002021-09-08. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS; SERVICE BRAKES, HYDRAULIC:CRITICAL FASTENERS

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
No. 90-212026-04-07. Service bulletin. Symptom based workshop manual for a Brake Symptom – Brake Pedal Travel Perceived as “Too Far”: Observe Specified Procedure
No. 105-25-12026-02-05. Service bulletin. Technical information for Active Malfunction Indicator Light in Conjunction with Fault Memory Entries Regarding Brake Booster "U01B400" and "C114113"
No. D7522026-02-05. Service bulletin. Parts information for parts withdrawal involving the caliper without brake pads. The part numbers affected are in the attached PDF. The vehicles associated are cars that use the part numbers in the PDF.
No. 25302025-12-05. Service bulletin. Instructions on advanced technical information for Y1A, 971, 9YB, 9YA – Brake Noise & Long Brake Pedal
No. D7492025-12-05. Service bulletin. Parts information for parts withdrawal involving the brake disc 9Y0615301AJ
No. 31-252025-08-04. Service bulletin. Technical information for a complaint Maneuvering Assistant: Implausible Standstill When Reversing
D7192025-06-02. Service bulletin. Parts information for Parts Withdrawal - 1 Set of Brake Pads for Disk Brake. Vehicles included are all cars that use part number 992698451R
D7122025-04-07. Service bulletin. Parts Information - Parts Withdrawal - Brake Hose & Retainer for Brake Hose
No. 90-212025-04-07. Service bulletin. Symptom-based workshop manual - Brake Symptom – Brake Pedal Travel Perceived as “Too Far”: Observe Specified Procedure (SY 90/21)
No. 187-242024-12-06. Service bulletin. Technical information for a Creaking Noises when Releasing the Footbrake: Observe Specified Procedure