Having this problem?

Voltage Auto Service specializes in advanced hybrid, plug-in hybrid and EV diagnostics. Schedule an appointment to have the fault properly tested before replacing parts.

2012 Toyota Prius C One – Brake Pedal Goes to Floor With C1246

Aug 16

1 min read

CUSTOMER CONCERN

The brake pedal drops to the floor and remains low after repeated bleeding attempts, with DTC C1246 stored.

CAUSE

Blocking the master-cylinder outlets and the hydraulic noise at the master cylinder isolated an internal brake master-cylinder failure rather than residual air alone.

CORRECTION

Remove and replace the failed brake master cylinder, perform the complete Prius brake air-bleed procedure, reset ABS memory and required initialization, clear DTC C1246, and verify a firm brake pedal and normal brake-system operation.

Recent Posts

See All

2020 Toyota RAV4 Hybrid LE – Hybrid System Fault With P0AA6-49 and P1C80-49

CUSTOMER CONCERN The hybrid system stores isolation-fault DTCs P0AA6-49 and P1C80-49 for the rear motor area. CAUSE Corrosion in the high-voltage floor under-wire harness caused the documented isolati

2021 Toyota Venza XLE – Park Assist Warning With U023A-87 After Collision Repair

CUSTOMER CONCERN After collision repairs and replacement of the front bumper and steering rack, the intuitive park-assist warning remains on and the EPS system stores U023A-87. CAUSE The replacement s

2020 Toyota Camry Hybrid SE – Check Engine Light With P2681-15

CUSTOMER CONCERN The engine control module stores DTC P2681-15 for the coolant-flow control circuit. CAUSE The confirmed repair identified a failed coolant flow control valve; Toyota's updated valve w

2012 Toyota Prius C One – Brake Pedal Goes to Floor With C1246

CUSTOMER CONCERN

CAUSE

CORRECTION

Recent Posts

CALL US

EMAIL US

OPENING HOURS