Brake Hold

Discussion in 'General Discussion' started by erdnase, Nov 7, 2016.

  1. erdnase

    erdnase Active Member

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    I've tried multiple times to get Brake Hold to work but nothing happens. How far are and fast are you meant to press down on the brake.
     
  2. Piff

    Piff MB Enthusiast

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    press hard until hold appears in the display
     
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  3. WOODYTHEWISE

    WOODYTHEWISE MB Enthusiast

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    Come to a stop as normal......then press on the brake harder. The hold should show on the display. You can then remove your foot from the brake pedal. To set off again just use the go pedal.
     
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  4. OP
    OP
    erdnase

    erdnase Active Member

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    Usually I find the eco stop start function kicks in and the engine goes off.
     
  5. Yugguy

    Yugguy MB Enthusiast

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    And that's a whole other debate. (;->
     
  6. Wheelsnuts

    Wheelsnuts MB Enthusiast

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    That should not stop the brake hold working.
     
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  7. CaptainChaos

    CaptainChaos Active Member

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    Try a sharp jab, rather than trying to push the pedal through the bulkhead.
     
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  8. TheFoX

    TheFoX Active Member

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    I sometimes find that I need to release the pressure slightly then reapply to engage HOLD.
     
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  9. David404

    David404 Active Member

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    Come to complete stop and apply firm but not harsh or jerky additional pressure. hold should then illuminate on the dash, remove foot from brake.

    Use with caution and never when fiddling with anything, all too easy to blip throttle.
     
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  10. grober

    grober MB Master

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    I think the tap or jab analogy to be good advice. Short sharp application/thrust on the brake pedal does the trick. Difficult to describe but you just need to do it once successfully to get the hang of it and it rapidly becomes second nature.
     
    Last edited: Nov 8, 2016
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  11. OP
    OP
    erdnase

    erdnase Active Member

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    Thanks for all the advice, how far is brake pedal meant to travel so the brake hold is activated..
     
  12. grober

    grober MB Master

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    Not very far at all just enough to take up movement slack and feel back pressure as the brake starts to apply/pressurise up. You shouldn't have to "stand" on the brakes as if stopping from speed.
     
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  13. John

    John Hardcore MB Enthusiast

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    I find a short sharp jab works fine (feels like you are pushing the pedal in about an inch).

    Car switches off and stays off whilst held (until it decides to turn back on or until I press the accelerator).
     
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  14. tangey

    tangey Active Member

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    I don't know what the actual criteria are, but to me, it seems to be the speed of travel, not the actual distance the pedal travels. The terms Jab or Dab are therefore pretty good. For example if you slowly depressed the pedal all the way down to the floor, Hold wouldn't activate.
     
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  15. knighterrant

    knighterrant MB Enthusiast

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    I find that after braking to a stop, an extra push (not necessarily a jab/dab) brings up Hold.
     
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  16. reflexboy

    reflexboy MB Enthusiast

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    I think with brake hold you just sort of get a feel for it. It is also a different sort of push of the pedal on different cars. My E class needs quite a firm push whilst my partner's SLK needs a gentle push to activate the hold function. Like I say, every car is different
     
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  17. Submariner1

    Submariner1 Member

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    First thing to do when you get in is to disable that!

    Worst engineering concept for 50 years, the only beneficiary is MB. ( huge EU eco grant, massive expected future parts and service revenues. )

    Bad points:-
    1. Knackers battieries
    2. Wears out starter motors and the gearing ring!
    3. Huge increease in engine wear due to startup wear. ( constantly stopping the engine displaces the protective start up film of oil. )
    4. Potentially distorts the crankshaft over time due to the off centre twisting.

    Er remember the old instructions :- start the engine and move off swiftly but without excessive revs. More wear done at startup than driving for half an hour.

    Almost as bad as that crazy idea of shutting off a few cylinders.
     
  18. houseboss2

    houseboss2 New Member

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    Absolutely correct, it never fails on my car and would assume
    it to be the same on all models.

    Michael
     
  19. knighterrant

    knighterrant MB Enthusiast

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    A total myth. This is what really happens with Mercedes start/stop:


    How the ECO start/stop system works in detail: as a general principle, the engine is switched off every time the vehicle comes to a standstill (auto-stop function. Restarting the engine (auto-starting function) takes place almost imperceptibly; and moving off without any noticeable time lag compared to a stationary vehicle with its engine running. This rapid action is attributable to two special features: a crankshaft Hall sensor which is able to identify the rotational direction of the crankshaft enables the engine control unit to identify the cylinder in which the piston is ideally positioned for starting. The fuel is injected into this cylinder first, thereby speeding up the starting process. An additional electric transmission oil pumpsupplies the clutches of the automatic transmission with oil pressure prior to starting, so as to enable a swift resumption of the journey after direct starting of the combustion engine via the ECO start/stop function. The starter motor (starter) has also undergone thorough modification: it is now designed to cope with eight times as many starting procedures, ensuring that it will last a car's lifetime in continuous urban driving involving frequent auto-starting. In addition, the on-board electrical system is supported by a second battery.
    Preconditions for the ECO start/stop function
    It is not always expedient for the engine to be shut down automatically when the vehicle comes to a standstill. The auto-stop function will therefore only be initiated if a number of conditions are met:
    1. The combustion engine must have attained the necessary operating
    parameters (e.g. the minimum coolant temperature).
    2. The relevant conditions relating to the vehicle must be met (e.g. sufficient voltage in the on-board electrical system, the interior climate has been regulated following the key start, the accumulator for the air suspension or brake system is sufficiently full). And the vehicle must be stationary, of course.
    3. The relevant conditions relating to the driver must be met: the transmission selector lever must be set to D or N; no movement of the accelerator or the steering wheel; the driver's foot must be on the brake or the HOLD function must be active; the doors must be closed, the driver's seat belt must be fastened and the bonnet must be closed.
    4. The ECO start/stop must not have been switched off via the ECO button.
    5. Relevant speeds must have been exceeded after starting with the ignition key or during manoeuvring, for example.
    Auto-starting takes place when the engine is in auto-stop mode, i.e. when the engine has been shut down via the engine-stop function and the ignition remains switched on. One of the following conditions must also be met:
    The accelerator pedal is pressed.
    Position "R" is selected on the transmission.
    The transmission selector lever is moved out of position "P".
    The brake pedal is released and Hold is not activated and the parking brake is released and the transmission selector lever is not set to "P".
    The ECO start/stop function is switched off via the ECO switch.
    The vehicle begins to roll.
    A function linked to running of the engine, e.g. raising of the ride height, is activated by the driver.
    But the start/stop function can think beyond that: it is also able to start the engine automatically as an intelligent comfort and safety function. The engine control unit starts the engine automatically, without any intervention on the part of the driver, when one of the following conditions is met:
    A vehicle-related precondition for the auto-stop function, such as the conditions pertaining to air conditioning, the on-board electrical system, the brake system, the chassis and other vehicle-related influences, is no longer met.
    The driver releases his seat belt or opens the driver's door. Automatic starting takes place in order to prompt the driver to actively switch off the engine by turning the ignition key to position 0, prior to leaving the vehicle. This ensures that the ECO start/stop system is safely deactivated when the vehicle is parked.
    To provide the driver of the CLS with the necessary assurance that the ECO start/stop function is working at all times, the availability of the auto-stop function is indicated by the ECO symbol on the multifunction display of the
    instrument cluster:
    Green = all conditions are met, engine will be shut down when the vehicle stops.
    Yellow = ECO is active, but conditions are not met.
    No ECO symbol displayed = ECO is switched off or has been deactivated due to an error.
    Show less
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  20. Happytalk73

    Happytalk73 MB Enthusiast

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    I was just about to say that. :D
     
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