What is the minimum fluid level for the master cylinder before rejecting a vehicle?

The minimum fluid level for the master cylinder being set at 50% full is critical for ensuring that the vehicle's braking system functions effectively. Brake fluid is essential for proper brake operation; it transfers the force from the brake pedal to the brake components at the wheels. If the fluid level drops below 50%, it may indicate a leak or issue in the brake system, which could compromise braking performance and overall vehicle safety.

Maintaining adequate brake fluid levels is vital, as insufficient fluid can lead to air entering the brake lines, resulting in a spongy brake pedal feel and diminished stopping power. Therefore, if the fluid level in the master cylinder is found to be at 50% or lower, rejecting the vehicle for inspection is necessary to promote safety and compliance with state regulations.