Repeatable Brake Bias using Brake Pressure Sensors

Many folks that have brake pressure sensors on their data acquisition system use them only to analyze their braking technique. That is how hard and when are the brakes applied. What if there’s more to it

Did you know on cars with a cockpit adjustable brake bias, you are missing out on a real advantage of having two brake pressure sensors if you don’t use them to help you set the brake bias to the desired value? Let me break it down for you.

Normally brake bias is presented as the percentage of front brake pressure like this:

BiasPercent = 100 * FrontPressure / (FrontPressure + RearPressure)

With some data systems, the bias can be calculated directly and displayed on the dash.   Make sure your dash is configured so you can see this info before heading out on track.

For systems where the bias isn’t calculated as a percentage, here’s another neat trick. Configure the dash to display both the front and rear brake pressures. In the car, press the brake pedal until the front pressure is 600 psi — note the rear pressure value. Assuming the bias is what you want — that number is your “magic number” for getting the adjuster back to that exact point. Should you adjust it while on track, to compensate for tire wear or conditions, you can return to the exact baseline by adjusting until your rear pressure is the same value when the front is 600 psi.

To adjust the brake bias you, generally, have to release the brakes, turn the adjuster and press the pedal again.

You might also determine that in the rain, you need a bit more rear brake bias so there won’t be as much weight transfer to the front. Again, learn what your magic number is for the wet, and you can dial it in when it begins to rain while you’re on pre-grid. What do you think, will this work for you?

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