Post by
bmike818 »
https://forums.nicoclub.com/bmike818-u56949.html
Mon Mar 09, 2009 8:41 am
ABS and EBD is totally different. ABS is there to prevent your wheels from locking up. EBD makes sure that you car remains stable under hard braking. This is different form the VDC system.
To know what the EBD does, one must know what brake bias means:
Bias Defined
What exactly is brake bias and how will it help you? Brake Bias is just a fancy way to describe how the total braking force is distributed between the front and rear tires.
Many factors affect the amount of braking force a tire can generate. The most important one is the force (weight, downforce, etc) pushing the tire against the ground (see sidebar on friction). As your car decelerates, weight is transferred from the rear to the front tires. This weight transfer reduces the amount of braking force the rear tires can produce. Apply too much braking to the rear wheels and they will lock up causing the rear end to lose traction and possibly swing around violently.
For most of us, losing traction on the rear end is one of the last things we want to have happen. However, some people actually use the knowledge of this principle to their advantage. Rally drivers use quick applications of the parking brakes to turn tighter corners. How many of us haven't used the parking brakes to spin "doughnuts" in a freshly snow covered parking lot? For now though, we will concentrate on getting the maximum braking force from all four of our tires without losing control.
Losing traction on the front tires is not as bad as on the rear. You usually plow forward in in the original direction until the driver lightens up enough on the pedal to regain control. As a general rule, 60% of your braking capacity should be on the front tires. Whatever the percentage is for your particular car, the front tires should lock up slightly before the rear tires.
The EBD system changes the brake bias constantly, this means the brake bias settings are different for a Z with a full tank of gas from a Z with 1/4 tank. That's High-Tech.