Toyota Prius C brake fluid failure and inconsistent brake light operation on Toyota Prius C

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Toyota Prius C owners report experiencing issues with brake fluid failure and inconsistent brake light operation. Common causes include low brake fluid levels, which can trigger brake light activation, and fluid leaks in the brake system that lead to a loss of brake fluid. Additionally, worn brake pads may affect braking performance, necessitating replacement if the vehicle does not stop as quickly as before. Some owners also encounter problems with the brake actuator, indicated by unusual noises or frequent operation of the system pump, suggesting a potential failure. Furthermore, diagnostic trouble codes (DTCs) may arise during brake maintenance, requiring proper system bleeding and resetting to avoid false brake failure warnings. Addressing these concerns promptly is crucial for maintaining the safety and efficiency of the Prius C's braking system.

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