Drums cannot be easily modulated without them locking up, especially in very slippery conditions, hence manufacturers put very little bias on them in passenger cars.
Originally Posted by supton
It's a positive if the alternative is fighting to get the drums off. I suspect heavy rear brake bias wasn't do-able until ABS came along, and even then, not until computational power got cheaper yet still. Given the issues of oversteer it has always been "better" to just let the fronts do all the work. Now that we have all sorts of computers running, heavy rear brake bias isn't a problem, heck i bet the car "knows" when it is under a load and has an idea where thresholds are, and will predictively know when to alter the pressures so as to avoid cycling ABS.
Originally Posted by AZjeff
It's interesting that many people see this as a positive thing. To me it means there's something off in the brake balance and you're not getting optimal braking. More rear bias, softer pad compound, something. No disrespect intended.
Originally Posted by Rolla07
Still on my original rear drum brakes at 165k miles.