Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2007 Toyota Prius BaseFACTORY OEM SERVICE PROCEDURE
Fail-Safe Chart
- FAIL-SAFE FUNCTION
- If a malfunction occurs in the skid control ECU, sensor signal, or actuator, the normally operating parts will maintain brake control.
- If the brake control is stopped under such conditions as when trouble occurs with a hydraulic pressure source, the pressure generated in the master cylinder by the driver is applied to the wheel cylinder to ensure braking force.
- A power back-up unit is built in as an additional power source to supply stable power to the system,
- If the regenerative brake alone does not operate under such conditions as a communication error with the HV ECU, control is switched so that all braking force is generated with the hydraulic pressure brake.SPECIFICATION CHART
Trouble Area Generated Braking Force Skid control ECU Normally operating parts will control brake and generate braking force Hydraulic pressure controlling parts Normally operating parts will control brake and generate braking force Hydraulic pressure source Braking force generated by the driver
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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