Race start loud clank and awkward braking
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Race start loud clank and awkward braking

This is a discussion on Race start loud clank and awkward braking within the Mercedes-Benz CLA45 AMG forums, part of the Mercedes-Benz CLA Model Specific Forums category; A very happy new year to everyone on this forum . I absolutely love my CLA and It feels even better to see how everyone ...

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Thread: Race start loud clank and awkward braking

  1. #1
    Newbie saxonjackson's Avatar
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    Race start loud clank and awkward braking

    A very happy new year to everyone on this forum . I absolutely love my CLA and It feels even better to see how everyone is so passionate on this forum .

    Recently I did run into an issue when I tried race start for the first time .

    1) once race start was started and the engine was at 4K . I released the brake but it made this loud clank sound, which was not from the exhaust but almost sounded like a bad loud clank sound as if something was released or slipped from the rear of the car. It happened every time I tried race start ( 3 times ) . After this the car would continue to work just the loud sound was the odd part.

    2) after I was able to get the car going even after the loud clank, I lightly pressed on the brake to stop and check what had happened, however instead of slowly coming to a halt it engaged in a really hard break on lightly pressing the brake and the car thudded and came to an instant halt as if the abs was seriously engaged. This was quite scary and at the end I was worried I had done some serious damage to either the engine or transmission or brakes or even the tires . But so far the car is working smoothly.

    3) lastly after I would get going, it would quickly say race start disengaged or inactivated , not so sure why.

    So would anyone have any ideas what this could have been ?? Do I need to go to the dealer or am I doing something wrong ?

    I will also add some pics of my vehicle I recently ceramic coated it . It looks great .

    Just some
    Info on the car - it's well maintained 13000 miles , never going over 2000-2500 rpm when engine and transmission is cold . No issues yet.


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    Pro Clallan's Avatar
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    this is normal. Race Start is... violent.
    2014 CLA45 AMG (Jupiter Red, Night, Exhaust, Premium, MM, MBTex w/ Recaro Seats, BSA, AMG steering wheel) -
    Ordered Nov 2013; Delivered April 2014. Engine Builder: Sylvio Muller

    2012 Subaru Forester
    2010 Volvo XC60
    2006 Subaru Impreza WRX
    1997 Toyota Camry
    1996 VW Jetta
    1989 Mercedes 560SL
    1986 Mercedes 560SEL
    1983 Mercedes 300D Turbodiesel

  • #3
    Newbie saxonjackson's Avatar
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    Thanks clallan, appreciate the reply .
    One of the main reasons I ask is because none of the videos I've seen on YouTube have any other sound apart from the exhaust .

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    Rookie Capt Torch's Avatar
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    I did several race starts, and so far no strange noises. Of course it is violent but a clunky noise and abrupt stop when touching the brakes is not good. Everything should operate smoothly. Do check in with dealer because it is not normal.
    My CLA 45 AMG has 6000Km and everything works smooth, even race start. yes a lot noise from exhaust and engine ( normal sounds)

  • #5
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    Just re read your post OP and the abrupt stopping seems out of place I would definitely have the dealer check out the transmission.
    2014 CLA45 AMG (Jupiter Red, Night, Exhaust, Premium, MM, MBTex w/ Recaro Seats, BSA, AMG steering wheel) -
    Ordered Nov 2013; Delivered April 2014. Engine Builder: Sylvio Muller

    2012 Subaru Forester
    2010 Volvo XC60
    2006 Subaru Impreza WRX
    1997 Toyota Camry
    1996 VW Jetta
    1989 Mercedes 560SL
    1986 Mercedes 560SEL
    1983 Mercedes 300D Turbodiesel

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    Newbie saxonjackson's Avatar
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    Yeah sounds about right I will take it to the dealer thanks so much guys really appreciate will update you on what the dealer says

  • #7
    Newbie saxonjackson's Avatar
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    So Mercedes dealer couldn't even half answer my question about the loud clanking noise, cause the handlers in the service department don't even know what race start is lol . So now I am to go there and race start with the mb service person, it's gonna be interesting trying to find an empty road for race start in the middle of the day in jersey haha

  • #8
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    Show them YouTube clips...
    2014 CLA45 AMG (Jupiter Red, Night, Exhaust, Premium, MM, MBTex w/ Recaro Seats, BSA, AMG steering wheel) -
    Ordered Nov 2013; Delivered April 2014. Engine Builder: Sylvio Muller

    2012 Subaru Forester
    2010 Volvo XC60
    2006 Subaru Impreza WRX
    1997 Toyota Camry
    1996 VW Jetta
    1989 Mercedes 560SL
    1986 Mercedes 560SEL
    1983 Mercedes 300D Turbodiesel

  • #9
    Newbie saxonjackson's Avatar
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    Good idea thanks

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