But to me it's even worse to loose control in the front when they lock up.
That's a common but absolutely incorrect misconception. Do a little reading on the subject and you'll quickly learn why all vehicles have most of the braking force up front. And think how a lot of stunt or security drivers get their rear-ends to slide out for fast u-turns... they often engage the rear parking brake to get the rear tires to lock up which makes it easy to get the vehicle to "swap ends".
And the whole point of ABS braking is to prevent brake lockup but the very worst/most dangerous brakes to have locked up are the rear brakes. That is why the brake proportioning valve is designed to bias the braking force towards the front to around 75/25, 70/30, or 80/20.
The reason being is that when you apply the brakes hard, that causes a massive weigh transfer towards the front which unweights the rear tires and puts most of the weight on the front tires and brakes. That makes it very easy to lock up the rear brakes in a hard stop, since there's no longer as much weight on the rear tires, which is why the brake proportioning valve is set to only give a small percentage of the available braking force to the rear brakes.