I cant find anything indicating a spring being used to "decrease" the strength of a linear pull brake. Given the lever advantage at the handle, I cant picture a little spring hidden in a rubber boot providing any "anti-lock" affect on a rim. A lawyer friend of mine DID say it would be more likely a bike company be sued for an instance of "I applied my brakes, they didn't stop me, and I hit a bus", rather than "I grabbed my brakes too hard and got launched over the handlebars". The latter is user error vs. the former being inadequate safety device effectiveness.