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      04-14-2021, 04:00 PM   #1
tgeho_e92
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Proportioning Valve

I’ve been trying to figure out if my 2010 328i x-drive had a proportioning valve for the brakes in its OEM stock form. If it does indeed have one then is it electronically controlled by the computer? Mechanically controlled based on which wheel needs optimal braking force? Another follow up question would be could you change the front-back pressure. If it does have a proportioning valve what is the pressure rating for the front/rear? 50/50, 70/30, 90/10? I guess my goal would be a lesser braking distance without changing much with the physical hardware.

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      04-14-2021, 09:58 PM   #2
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The DSC handles brake proportioning using the wheel speed sensor inputs.
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      04-14-2021, 10:23 PM   #3
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Quote:
Originally Posted by 3PedalJake View Post
The DSC handles brake proportioning using the wheel speed sensor inputs.
So it's constantly changing based on what's needed. I'm assuming it's capable of 100/0 or 0/100 brake pressure? Or maybe something different?
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      04-14-2021, 10:41 PM   #4
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Quote:
Originally Posted by tgeho_e92 View Post
So it's constantly changing based on what's needed. I'm assuming it's capable of 100/0 or 0/100 brake pressure? Or maybe something different?
The DSC is controlling braking as well as throttle based on wheel speed, engine load, throttle position, steering position and tries to keep you from spinning or skidding or sliding off a too-fast turn, that's the Dynamic part of Stability Control. Whatever the exact parameters for it are they're in a map somewhere in the DSC software.
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      04-15-2021, 05:35 PM   #5
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Quote:
Originally Posted by 3PedalJake View Post
The DSC is controlling braking as well as throttle based on wheel speed, engine load, throttle position, steering position and tries to keep you from spinning or skidding or sliding off a too-fast turn, that's the Dynamic part of Stability Control. Whatever the exact parameters for it are they're in a map somewhere in the DSC software.
What about when this is turned off? Does it keep the braking parameters but shut off the traction parameters? Basically keeping the dynamic part but leaving the stability control.
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      04-16-2021, 03:34 PM   #6
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It's all handled by the DSC. it monitors all the pressures to the brake outputs and controls distribution.
"Disabling" the DSC just tells it to not interfere, it doesn't make it turn off.

if you want to improve braking for minimal cost, buy better pads and change the fluid.

If you think there were a performance gain to be had with a simple brake force change, don't you think the factory likely would have found it?
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      04-16-2021, 09:57 PM   #7
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Originally Posted by nsjames View Post
It's all handled by the DSC. it monitors all the pressures to the brake outputs and controls distribution.
"Disabling" the DSC just tells it to not interfere, it doesn't make it turn off.

if you want to improve braking for minimal cost, buy better pads and change the fluid.

If you think there were a performance gain to be had with a simple brake force change, don't you think the factory likely would have found it?
Possibly but I’m sure they have to balance comfort/efficiency/performance. I’ve read in many cases where OEMs set the brake pressure almost exclusively front bias pressure. That may have been the days when most cars had drum brakes in the rear. If it does it automatically then it most likely finds the path of least resistance already. Also having a fixed ratio might be worse then having a fluid one.
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      04-17-2021, 12:53 AM   #8
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I've found the factory EBD (electronic brakeforce distribution) is quite good, and very adaptable as well. Threshold braking feels natural and not "one axled"...it is very slightly front biased, but nowhere near as bad as others I've driven. EBD does way more than you can ever notice, as well, as it is constantly adjusting to inputs such as ABS (grip loss, per wheel), steering angle, yaw, deceleration, and much more.
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      04-17-2021, 09:01 AM   #9
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Quote:
Originally Posted by tgeho_e92 View Post
Possibly but I’m sure they have to balance comfort/efficiency/performance. I’ve read in many cases where OEMs set the brake pressure almost exclusively front bias pressure. That may have been the days when most cars had drum brakes in the rear. If it does it automatically then it most likely finds the path of least resistance already. Also having a fixed ratio might be worse then having a fluid one.
the factory brakes are already capable of exceeding the mechanical grip of the tires.

The ABS system will make sure that you are doing threshold braking at every wheel, all the time.
Changing the distribution won't accomplish anything because ABS.

If you want better brakes, either commit to a whole sale mechanical upgrade like doing F series brakes, or just put some better pads on it.
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      04-17-2021, 09:22 AM   #10
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Quote:
Originally Posted by nsjames View Post
Quote:
Originally Posted by tgeho_e92 View Post
Possibly but I’m sure they have to balance comfort/efficiency/performance. I’ve read in many cases where OEMs set the brake pressure almost exclusively front bias pressure. That may have been the days when most cars had drum brakes in the rear. If it does it automatically then it most likely finds the path of least resistance already. Also having a fixed ratio might be worse then having a fluid one.
the factory brakes are already capable of exceeding the mechanical grip of the tires.

The ABS system will make sure that you are doing threshold braking at every wheel, all the time.
Changing the distribution won't accomplish anything because ABS.

If you want better brakes, either commit to a whole sale mechanical upgrade like doing F series brakes, or just put some better pads on it.
Will the F series brakes fit on my x-Drive 328
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      04-18-2021, 10:03 AM   #11
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Quote:
Originally Posted by tgeho_e92 View Post
Will the F series brakes fit on my x-Drive 328
the fronts bolt on, the rears require an eccentric spacer and e60 calipers.

it's all well documented on the internet.
https://*********************/thread...93-guide.2941/

spool street is the website that's blocked out because this website sucks.
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