Small Brake Fluid Leak for Toyota
Some 2011-2015 Toyota Prius and 2012-2015 Prius Plug-in Hybrid vehicles may exhibit a condition where the brake, anti-lock brake system (ABS) and/or active traction control (TRAC) warning lights are on and/or a check vehicle stability control (VSC) message displays. Diagnostic trouble codes (DTCs) C1391, C1252 and C1253 may be stored. This condition may be caused by a small internal brake fluid leak inside the brake booster assembly with the master cylinder.
Are the brake, ABS and/or TRAC warning lights on and/or does a check VSC message appear on the display? If yes, continue to Step 2.
Using Techstream, check and record any DTCs. If the afore-mentioned codes are set, continue to Step 3.
Remove the brake booster assembly with the master cylinder.
Remove the brake booster pump assembly.
Install a new brake booster assembly with the master cylinder.
Install a new brake booster pump assembly.
Test drive to confirm the repair.
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.
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.