Electronic Brake Force Distribution and Brake assist

Nissan 350z / Nissan 370z general community discussion forum
Phoenix SRT
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Joined: Sat Feb 28, 2009 1:24 pm

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I posted this question as a reply in another topic, but wasn't getting much of a response. That may have been because it was buried and not being seen by many folks, so here goes again. Thanks for any help.

What are Electronic Brake force Distribution (EBD) and Brake Assist (BA). More importantly, are either part of, or code words for, stability contol? And if stability control is involved, can it be shut off competely? I searched but didn't find the answers to those specific questions.


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bmike818
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Car: 2007 Z

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EBD- Electronic brakeforce distribution or EBD or EBFD is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes, based on road conditions, speed, loading, etc. Always coupled with anti-lock braking systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping power whilst maintaining vehicular control.[1][2] Typically, the front end carries the most weight and EBD distributes less braking pressure to the rear brakes so the rear brakes do not lock up and cause a skid.

BA-Brake Assist is a generic term for an automobile braking technology that increases braking pressure in an emergency situation.

Unless your car has "VDC" you don't have stability control. The only system that ties in with the VDC is the TCS (traction control system).

The VDC and the TCS systems can be turned off. The button is located on top of your fuel release button.

Phoenix SRT
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bmike818 wrote:EBD- Electronic brakeforce distribution or EBD or EBFD is an automobile brake technology that automatically varies the amount of force applied to each of a vehicle's brakes, based on road conditions, speed, loading, etc. Always coupled with anti-lock braking systems, EBD can apply more or less braking pressure to each wheel in order to maximize stopping power whilst maintaining vehicular control.[1][2] Typically, the front end carries the most weight and EBD distributes less braking pressure to the rear brakes so the rear brakes do not lock up and cause a skid.

BA-Brake Assist is a generic term for an automobile braking technology that increases braking pressure in an emergency situation.

Unless your car has "VDC" you don't have stability control. The only system that ties in with the VDC is the TCS (traction control system).

The VDC and the TCS systems can be turned off. The button is located on top of your fuel release button.
Based on this explanation, EBD sounds much like ABS. But, a list of features on the 350Z NISMO includes both ABS and EBD so they are apparently different. Do you know how they differ?

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bmike818
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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.


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ldstang50
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ABS-anti lock braking systemEBD-as described by bigmike aboveABS prevents your tires from locking up under braking.What EBD does is distribute the maximum amount of braking to the tire(s) with the most grip. In most ABS system, if one tire is on a slippery surface and you hit the brakes, your ABS kicks in because that one tire is locking up and the ABS is activated to all the tires. This INCREASES your stopping distance because the tires with grip are not being used to their potential.EBD will distribute the braking power to the tires with more grip and only modulate or activate the ABS to that one tire that is locking up. This is also called 4wheel independant braking or 4wheel independant ABS. This ensures the shortest stopping distance possible in all surfaces.

Phoenix SRT
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Thank you for the quick replies.


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