Brake pedal hard when using Adaptive Cruise Control
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Thread: Brake pedal hard when using Adaptive Cruise Control

  1. #1
    Junior Member vertrkr's Avatar
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    Brake pedal hard when using Adaptive Cruise Control

    When ever i'm using the Adaptive Cruise Control the first time I hit the brakes the pedal is hard with no free play like it lost it's vacuum. It stops just fine and doesn't require any extra effort and the 2nd press the brake pedal goes back to normal.

    Just wondering if everyone else's behaves this way.
    Last edited by vertrkr; 04-24-2015 at 04:10 PM.

  2. #2
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    I noticed they're "grabby" but never put 2 and 2 together. I'm guessing the ACC kicks in the ready alert braking which i think basically applies enough pressure to get the "slack" out of the brake system. That way there is NO free play so that the brakes respond a fraction of a second sooner.

    (just a guess but perhaps the ACC needs to get the variable out of the way that the "slack" provides. If it's calculating braking distance to maintain proper distances maybe they didn't want to put in yet another variable into the equation?)

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    Senior Member SLAINTE06's Avatar
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    I think mine does that, dam thing has scared crap out of me a few times, also it has a weird way of braking when it kicks in, not like it screeches but more grinds I guess.
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    Senior Member Shelbyguy's Avatar
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    I think they brakes are pre-charged to a higher level when the adaptive cruise is on. Try it with the standard cruise and see if it's the same. I never noticed a difference when using the adaptive cruise.

    Marty

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    Super Moderator tomk's Avatar
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    if the ACC/FCW has started to brake, the brake system is partially pressurized, so it "catches" at a higher pedal.. not really any way around that, you are adding your braking to the braking already in progress.

    I've gotten used to it.

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    Quote Originally Posted by SLAINTE06 View Post
    I think mine does that, dam thing has scared crap out of me a few times, also it has a weird way of braking when it kicks in, not like it screeches but more grinds I guess.
    I noticed that too. I was thinking that it's becasue it applies "just enough" pressure to maintain the proper distance rather then just braking hard and stopping right now like a human would.

    As an aside I love the ACC- it reacts faster than I can. I was driving in the rain on 95 in philly a couple weeks back. It's all under construction plus the normal philly traffic so I was totally paying attention ready to slam the brakes if needed. It opened up by and everyone got back up to going highway speed and some yuckle head in the left lane decides he wants to get over to the exit in a couple hundred feet and basically STOPS in the left lane a couple cars in front of me. I go to slam the brakes and before i get my foot there the ACC has it all under control. Cars swerving all over and horns a honking. I almost had to change my shorts but the ACC had it all under control faster than my reaction. I LOVE IT.

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