Quote:
Originally Posted by LVR
I might be on to a cause (and therefore a solution...)
I happened to be flicking through the vehicle manual on the weekend whilst looking for a way to change the DSP sound preset (got the original nav) and came across an index reference to EBV....
The manual states that it is a booster for the braking force to the rear wheels to assist the vehicle stopping straight particularly at speed with extra pressure. Been doing some digging and it apparently relates to an electrical harness/contact on the right rear wheel being rusty somewhere...
Have to replace a plastic retaining clip on the rear axle for the brake lines so as soon as it comes in am going to see what I can find....
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Found this in one the BMW training manuals (on brakes...)
Electronic Brake Proportioning (EBV)
The Electronic Distribution of the braking force (EBV). Will adjust the braking force to the rear wheels based on the vehicle’s loading to maximize the braking force at all wheels.
The control module monitors the wheel speed sensor inputs, when the brakes are applied, to determine vehicle loading. The control module compares the rate at which the front and rear axles are slowing down.
If the rear axle is slowing at a rate similar to the front it indicates that the vehicle is loaded and more braking force can be applied to the rear calipers to stop the vehicle.
If the decel rate of the rear wheels is far less than the front, it indicates a lightly loaded vehicle. At this point, if the same braking force were applied to the front and rear axles, the vehicle would become unstable.
If this difference exceeds the threshold values programmed in the control module, EBV is activated. The control module will cycle the inlet valves to the rear brakes to regulate the braking force.
Sounds like it uses the wheel speed sensors and not any other sensor...
