Auto safety regulators said a brake control module software on some GM models may fail to display a warning light when a loss of brake fluid occurs.

GM is recalling more than 449,000 vehicles from its Cadillac, Chevrolet and GMC brands over an issue that may prevent the low brake fluid warning light from illuminating.

Without the warning light, a vehicle may be driven with low brake fluid, which can reduce braking performance and increase the risk of a crash, safety agency said.