Service Repair

Toyota Prius Leaks Brake Fluid

May 20, 2022

A small internal brake fluid leak inside the brake booster assembly may be causing the brake, ABS and/or TRAC warning lights to illuminate on some 2011-2015 Toyota Prius and 2012-2015 Prius Plug-in Hybrid vehicles.

Information courtesy of Mitchell 1,

Mike Mavrigian

Some 2011-2015 Toyota Prius and 2012-2015 Prius Plug-in Hybrid vehicles may exhibit a condition where the brake, ABS and/or TRAC warning lights are illuminated and/or a Check VSC message displays.

DTCs C1391, C1252, C1256 and C1253 may be stored. This condition may be caused by a small internal brake fluid leak inside the brake booster assembly. If any of these DTCs are stored, remove and replace the brake booster assembly with master cylinder. Note that replacement booster/master assemblies are enhanced versions that feature a different part number than original.

MODEL YEAR PRIUS	PREVIOUS	NEW
2011	47050-4714	04008-11147
	47050-47150	04008-11247
2012-2013	47050-47180	04008-11347
	47050-47190	04008-11447
2014-2015	47050-47310	04008-11547
	47050-47320	04008-11647

MODEL YEAR PRIUS PHV	PREVIOUS	NEW
2012-2013	47050-47210	04008-11747
2014-2015	47050-47340	04008-11847

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.