NHTSA ID Number: 10198129
Manufacturer Communication Number: T-SB-0028-21
TSB/Document Date: 2021-06-21
Summary
TSB: Some 2012 ? 2014 model year Prius C hybrid
vehicles may exhibit a condition in which the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. Diagnostic Trouble Codes (DTCs) C1391, C1252, C1256, and/or C1253 may also be stored. This condition may be caused by a small internal brake fluid leak inside the brake booster assembly with master cylinder. Follow the Repair Procedure in this bulletin to address this condition.
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- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
- Provides an extra margin of safety in extreme braking...
- Mix of polyglycol ethers ensures hot brake-system operation...
- Excellent for ABS, disc and drum brake systems
- Delivers braking power when needed by avoiding a spongy...
- Both wet and dry boiling points exceed the minimum...
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TSB/Document ID: T-SB-0028-21
Replacement Service Bulletin Number:
MFR Communication Date: 2021-05-11
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
T-SB-0028-21
May 11, 2021
ABS Brake Warning Light On
Service
Category
Brake
Section
Brake Control/Dynamic Control System
Market USA
Applicability
YEAR(S)
MODEL(S)
2012 - 2014
Prius C
ADDITIONAL INFORMATION
Introduction
Some 2012 – 2014 model year Prius C hybrid vehicles may exhibit a condition in which the brake,
ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. Diagnostic
Trouble Codes (DTCs) C1391, C1252, C1256, and/or C1253 may also be stored. This condition
may be caused by a small internal brake fluid leak inside the brake booster assembly with master
cylinder. Follow the Repair Procedure in this bulletin to address this condition.
Warranty Information
MODEL YEAR
2012 – 2014
MODEL
Prius C
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
BR1922
R & R Brake Booster Assembly
With Master Cylinder
and
Brake Booster Pump Assembly
2.3
47050-#####*
8C
99
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being repaired
by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Toyota Basic Warranty. This warranty is in effect for
36 months or 36,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
© 2021 Toyota Motor Sales, USA
Page 1 of 3
T-SB-0028-21
May 11, 2021
Page 2 of 3
ABS Brake Warning Light On
Parts Information
PART NUMBER
MODEL YEAR
MODEL
2012 – 2013
PART NAME
PREVIOUS
NEW
47050-52020
04000-23152
47050-52040
04000-23252
47050-52220
04000-23352
47050-52240
04000-23452
47070-52020
04006-74152
QTY
Cylinder Kit, Brake Master W/Fluid
Prius C
2013 – 2014
2012 – 2014
1
Pump Assy Kit, Brake Booster
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVI*
PART NUMBER
QTY
TSADVUNIT
Techstream 2.0
TS2UNIT
ADE
1
Techstream Lite
TSLITEPDLR01
Techstream Lite (Green Cable)
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
Software version 16.00.021 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787.
© 2021 Toyota Motor Sales, USA
T-SB-0028-21
May 11, 2021
Page 3 of 3
ABS Brake Warning Light On
Repair Procedure
1. Confirm the condition exists.
Are the brake, ABS, and/or TRAC warning lights on and/or does a Check VSC
message display?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Using Techstream, check for and record ANY stored DTCs.
Are ANY of the following DTCs stored: C1391, C1252, C1256, or C1253?
YES — Continue to step 3.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
3. Remove the brake booster assembly with master cylinder.
Refer to TIS, applicable model and model year Repair Manual:
2012 / 2013 / 2014 Prius C:
Brake – Brake System – “Brake System (Other): Brake Booster: Removal”
4. Remove the brake booster pump assembly.
Refer to TIS, applicable model and model year Repair Manual:
2012 / 2013 / 2014 Prius C:
Brake – Brake System – “Brake System (Other): Brake Booster Pump: Removal”
5. Install the NEW brake booster assembly with master cylinder.
Refer to TIS, applicable model and model year Repair Manual:
2012 / 2013 / 2014 Prius C:
Brake – Brake System – “Brake System (Other): Brake Booster: Installation”
6. Install the NEW brake booster pump assembly.
Refer to TIS, applicable model and model year Repair Manual:
2012 / 2013 / 2014 Prius C:
Brake – Brake System – “Brake System (Other): Brake Booster Pump: Installation”
7. Using Techstream, clear ANY stored DTCs and test-drive the vehicle to confirm the condition is
no longer present.
© 2021 Toyota Motor Sales, USA
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