Do modern/fwd cars have more brake bias?

[Slow]

Was just driving a 2018 hyundai tuscon fwd on a gravel drive. Just pressed the brakes as I normally would and felt the rear step out. Nothing major just a feeling that it was odd.

Made me wonder if it is something to do with being fwd or just a fairly modern car as I have never had this in any of my Range Rovers or Bmws over the years doing the same thing.

Might just be the car being the way it is as it always wheelspins on the gravel if going up a slight hill which again is weird.

[Slow]

Title should say rear brake bias.

[Haltamer]

Rather than proportioning valves of old, they use electronic brake distribution controller which is something of a subset of ABS - It's all housed within the VSA control system, so once the rear begins locking up, it will "pause" brake pressure to the rear rather than release the brakes (As with ABS)


From the Honda service manual (Different of course, but I'm taking a shot here that the sytem is very similar):
"When rear wheel speed is less than the estimated vehicle speed, the VSA modulator-control unit closes the inlet valve to maintain brake fluid pressure. As wheel speed increases, the VSA modulator-control unit opens the inlet valve momentarily to increase the brake fluid pressure. When lower pressure is required, the modulator unit opens the outlet valve momentarily decreasing fluid pressure. The VSA modulator-control unit repeats this valve control operation to control the EBD function."

I could see how such a system may lead to momentary twitching of the rear, as it is looking for wheel locking similar to ABS, but it does enable maximum-possible braking effort if you've got 300kg of bricks in the boot.

[Pica-Pica]

I am not sure about recent ABS systems, but they used to not operate below about 4mph. I recall I could always make my wheels lock up on wet leaves if I pressed hard at very low speeds.