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Thread: EPB Emergency Stop

  1. 20th February 2014, 02:59 PM #21
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    letherm
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    Was telling my son about this and he asked a good question. What happens if your brakes have failed if you pull the EPB lever. In a normal car this would activate the parking brake via a cable.

    Would the parking brake still be applied if the normal brakes have failed?

    Martin
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  2. 20th February 2014, 04:53 PM #22
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    Quote Originally Posted by letherm View Post
    Was telling my son about this and he asked a good question. What happens if your brakes have failed if you pull the EPB lever. In a normal car this would activate the parking brake via a cable. Would the parking brake still be applied if the normal brakes have failed? Martin
    Maybe then, you number is up.

    Brett....
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  3. 20th February 2014, 05:02 PM #23
    BobD
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    I haven't tried it but I assume you would use it the normal way by a single pull on the lever with your foot off the accelerator and it would work as it does when parked, rather than as an emergency brake as it does when you hold the lever up continuously.

    Would this be correct, Gordon?

    Bob
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  4. 20th February 2014, 07:02 PM #24
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    gghaggis
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    No, the epb won''t operate whilst the car is moving at any speed. It would still activate the transmission downshifts, but it won't do miracles.

    Cheers,

    Gordon
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  5. 20th February 2014, 07:05 PM #25
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    Quote Originally Posted by gghaggis View Post
    No, the epb won''t operate whilst the car is moving at any speed. It would still activate the transmission downshifts, but it won't do miracles.
    Cheers,
    Gordon
    Incorrect.

    If you pull up and hold the EPB, this is telling the vehicle you want to perform an emergency stop.

    Irrespective of other driver inputs, the ECU will then bring the vehicle to a standstill as quickly as possible by applying maximum braking power to all wheels (ABS, DSC, etc. will still come into effect).

    So even if the driver has his foot planted on the accelerator, this procedure will still work.
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  6. 20th February 2014, 07:17 PM #26
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    Dearie me ......

    Following from BobD's post, if you apply the EPB NORMALLY ( ie you momentarily pull it up), it will not activate at speed. Of course, if you hold it on for 2 sec, the emergency stop algorithm will be implemented. But that doesn't activate the EPB!

    Clearer?
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  7. 20th February 2014, 07:19 PM #27
    Graeme
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    Quote Originally Posted by letherm View Post
    Would the parking brake still be applied if the normal brakes have failed?
    Yes. According to the manual the EPB will be applied as a last resort if the vehicle is not slowing as expected when the EPB lever is held up.
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  8. 20th February 2014, 07:21 PM #28
    BobD
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    Thanks Gordon.
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  9. 20th February 2014, 09:30 PM #29
    Celtoid
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    I don't think this conversation is being helped by the fact that the lever commonly referred to as the EPB may or may not actually work as a park brake .... depending on the parameters.


    And the same lever is being used to initiate an emergency braking system, under certain parameters..... but not the park brake....


    Clear ....LOL????
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  10. 20th February 2014, 11:40 PM #30
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    You're right, and me trying to type responses on a phone isn't helping. So to be clear(er):

    If the braking system is working normally, pulling up on the EPB lever whilst travelling over the cut-off speed (5kph) will not engage the EPB - a momentary application (as per when you're applying the EPB to park) will have no effect. Holding the lever up for over 1 ~ 2 seconds will engage the emergency stop routine, which doesn't invoke the EPB mechanism, but uses the ABS/ETC/DSC/transmission to stop you as fast as possible without losing line, for as long as you hold it up (caveat: the EPB will engage once you're under 5 kph).

    However, if the disc braking system is NOT working: again a momentary application of the EPB lever at speeds above 5 kph will do nothing; holding up the lever to invoke the emergency stop will (as a last resort) engage the EPB proportionally, such that skidding is not invoked (along with the transmission braking).

    Hopefully, that's clear.

    Cheers,

    Gordon
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