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ABS low brake torque after jump

Discussion in 'Troubleshooting: Bugs, Questions and Support' started by Hemuli, Aug 12, 2024.

  1. Hemuli

    Hemuli
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    Joined:
    Sep 24, 2014
    Messages:
    5
    Jumping, then accelerating the wheels up to a high speed mid-air, then applying the brakes still mid-air causes the brakes to brake very little even long after landing and the car stabilizing.

    Re-applying the brakes after landing makes the brakes behave normally.

    Realistic ABS mode, doesn't matter if FWD, RWD, AWD car. Multiple different cars exhibit the same behavior.

    Maybe this is somehow realistic? Doubt it though :D

    Video attached
     

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  2. the dog

    the dog
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    Joined:
    Apr 28, 2020
    Messages:
    9
    When you jump and accelerate the wheels mid-air, the wheels are spinning freely with no load. The ABS is designed to monitor wheel speed and modulate brake pressure to prevent wheel lock-up. However, when the wheels are spinning at high speed mid-air and you apply the brakes, the ABS detects a significant difference between the wheel speeds and the vehicle's speed (which is effectively zero since the car isn’t on the ground).
    The ABS assumes that the wheels are slipping, so it reduces brake pressure significantly to avoid a perceived lock-up. Since the car is still mid-air, this brake pressure modulation continues, leading to very little braking effect even after landing.
    Once the car lands and the wheels regain traction, the ABS continues to believe that the wheels are still at risk of locking up because the system is still processing the last known condition—wheels spinning freely at high speed with low brake pressure. This can cause the brakes to feel ineffective or weak immediately after landing.
    When you re-apply the brakes after the car has stabilized on the ground, the ABS recalibrates based on the actual conditions—wheels with load and proper traction. This recalibration allows the brakes to function normally again.
    So yes, while it might seem like an odd behavior, it’s actually rooted in the realistic functioning of ABS and brake systems. The need to reapply the brakes after landing allows the system to reset and apply the correct amount of braking force based on the new conditions.
     
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