How does brake bias affect vehicle stability during braking?

Brake bias is the front/rear distribution of braking force. Under braking, weight transfers forward, increasing front axle grip and reducing rear grip. Optimal bias matches braking force to available grip at each axle, which changes with deceleration. Too much rear bias causes rear lock-up and spin; too little underutilizes rear brakes. Production vehicles use front-biased distribution for safety. EBD (Electronic Brake Distribution) dynamically adjusts bias based on load and deceleration for optimal braking.