Accidentally applied parking brake whilst driving

Accidentally applied parking brake whilst driving

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Butterfly88

Original Poster:

11 posts

41 months

Thursday 5th August 2021
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So today whilst driving I went to turn my seat warmer off in my Mitsubishi PHEV and accidentally flicked the parking brake up, whilst travelling at circa 40, warning light came on immediately of course, felt a small jolt and quickly flicked it off again but now I’m terrified I may have harmed the car components. The car drove completely fine afterwards. When I parked back home I got a further fright when I applied the parking brake and a warning light came on with something like “auto hold cancelled”. I put the car into drive again and reapplied the parking brake. I must have flicked auto hold as well in my panic to disable the parking brake. I’ve never used this function but gather it’s fine to have switched on whilst driving. Realistically what are the chances of me having done any harm to my vehicle through this? I was planning to take to a garage tomorrow for a check up for peace of mind, but don’t want to go in armed with no knowledge! Thank you in advance

Wills2

22,889 posts

176 months

Thursday 5th August 2021
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If you had to do an emergency stop today would you be worried that the car was broken?


annodomini2

6,867 posts

252 months

Thursday 5th August 2021
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The parking brake is also the emergency brake, should your hydraulics fail (very rare) it acts as so you pull the switch and it's designed to bring the car to a halt. (I still think this is a poorer design than a mechanical hand brake.)

I don't know the setup in your car, but most OEMs systems are integrated, they will try to work to avoid damage (where it does not conflict with safety requirements).

Likely you've given the brakes a heat soke, worn your pads a little bit.

Possibly warped the discs (depends on duration).

Worst case you've damaged a sensor or the caliper actuator.

HustleRussell

24,726 posts

161 months

Thursday 5th August 2021
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It’ll be fine. Electric handbrakes have been around for ages, there’s no way they’d engineer it in such a way that application whilst moving could cause serious damage.

CharlesdeGaulle

26,305 posts

181 months

Thursday 5th August 2021
quotequote all
It will be fine. My BMW handbook says you can use it as an emergency brake if necessary. You've probably caused a negligible bit of extra pad wear. Don't worry, and don't bother taking it to a garage unless you get other problems or warnings.

Megaflow

9,444 posts

226 months

Thursday 5th August 2021
quotequote all
It is not a parking brake. It is a brake.

The primary use these days is for parking, but that is because modern brakes are so reliable that is not needed during driving. The primary reason for it being fitted is a back up for use in emergencies if the foot brakes fail.

Serious question, when did you pass your test and how did you pass it not knowing this?

mac96

3,793 posts

144 months

Thursday 5th August 2021
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I am surprised that no one has pointed out yet that the main purpose of a handbrake is for handbrake turns.... Or at least it was before electric ones!

Shambler

1,191 posts

145 months

Thursday 5th August 2021
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Megaflow said:
It is not a parking brake. It is a brake.

The primary use these days is for parking, but that is because modern brakes are so reliable that is not needed during driving. The primary reason for it being fitted is a back up for use in emergencies if the foot brakes fail.

Serious question, when did you pass your test and how did you pass it not knowing this?
Why post the final sentence?

Evil.soup

3,595 posts

206 months

Thursday 5th August 2021
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mac96 said:
I am surprised that no one has pointed out yet that the main purpose of a handbrake is for handbrake turns.... Or at least it was before electric ones!
Exactly this!!

Many applications of the handbrake while moving when I was a yoof did no damage at all. The E-brake is pretty much the same old working parts but with electric motors and a nanny brain controlling things. Other than getting told off by the computer, the components should be totally unharmed.

MDL111

6,975 posts

178 months

Thursday 5th August 2021
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I once did half a lap on a track day with the parking brake still lightly engaged. It still works, so probably all fine

HTP99

22,586 posts

141 months

Thursday 5th August 2021
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If you hold the switch up it will gradually apply the brakes until you slow to around 5 mph then they will lock on, a quick flick of the switch won't do any harm.

HJG

465 posts

108 months

Thursday 5th August 2021
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mac96 said:
I am surprised that no one has pointed out yet that the main purpose of a handbrake is for handbrake turns.... Or at least it was before electric ones!
OP must've had a boring youth

Megaflow

9,444 posts

226 months

Thursday 5th August 2021
quotequote all
Shambler said:
Megaflow said:
It is not a parking brake. It is a brake.

The primary use these days is for parking, but that is because modern brakes are so reliable that is not needed during driving. The primary reason for it being fitted is a back up for use in emergencies if the foot brakes fail.

Serious question, when did you pass your test and how did you pass it not knowing this?
Why post the final sentence?
Because the OP is asking a question about damaging the emergency/handbrake by using it while the car is moving. What would the OP do in a genuine emergency if the foot brake had failed? It terrifies me how many people drive a car with no understanding of how to properly operate it, and for some reason I cannot fathom, not knowing how to operate a car properly and/or not caring about how to is consider cool in this country.

Butterfly88

Original Poster:

11 posts

41 months

Thursday 5th August 2021
quotequote all
Megaflow said:
It is not a parking brake. It is a brake.

The primary use these days is for parking, but that is because modern brakes are so reliable that is not needed during driving. The primary reason for it being fitted is a back up for use in emergencies if the foot brakes fail.

Serious question, when did you pass your test and how did you pass it not knowing this?
Was there really a need to be snarky?

Butterfly88

Original Poster:

11 posts

41 months

Thursday 5th August 2021
quotequote all
Shambler said:
Why post the final sentence?
Thank you!

Butterfly88

Original Poster:

11 posts

41 months

Thursday 5th August 2021
quotequote all
Thanks everyone for your help, given me peace of mind

Butterfly88

Original Poster:

11 posts

41 months

Thursday 5th August 2021
quotequote all
Megaflow said:
Because the OP is asking a question about damaging the emergency/handbrake by using it while the car is moving. What would the OP do in a genuine emergency if the foot brake had failed? It terrifies me how many people drive a car with no understanding of how to properly operate it, and for some reason I cannot fathom, not knowing how to operate a car properly and/or not caring about how to is consider cool in this country.
FYI my first car brakes failed and I stopped it successfully without incident, whilst learning to drive. That was a manual. I took my test in a manual like most people. I now drive an automatic so it’s not exactly a stupid question to ask when I didn’t learn about the inner workings of an automatic car. Additionally, if I were needing to do an emergency stop clearly I’d be more concerned about preserving life and worry about any damage to my car afterwards. In this instance I clearly had no reason to apply it hence my primary concern was whether I had damaged my car. If the thought you expressed TERRIFIES you I suggest you stop in bed and never leave the house. Seriously. If you can’t be kind or helpful then stay silent.

Thanks everyone else.

Megaflow

9,444 posts

226 months

Thursday 5th August 2021
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Butterfly88 said:
FYI my first car brakes failed and I stopped it successfully without incident, whilst learning to drive. That was a manual. I took my test in a manual like most people. I now drive an automatic so it’s not exactly a stupid question to ask when I didn’t learn about the inner workings of an automatic car. Additionally, if I were needing to do an emergency stop clearly I’d be more concerned about preserving life and worry about any damage to my car afterwards. In this instance I clearly had no reason to apply it hence my primary concern was whether I had damaged my car. If the thought you expressed TERRIFIES you I suggest you stop in bed and never leave the house. Seriously. If you can’t be kind or helpful then stay silent.

Thanks everyone else.
Yes, the amount of people on the road that have no clue how a car works does bother me, maybe terrifies is a bit over the top. It bothers me because I have to share the road with people like this.

Megaflow

9,444 posts

226 months

Thursday 5th August 2021
quotequote all
Shambler said:
Megaflow said:
It is not a parking brake. It is a brake.

The primary use these days is for parking, but that is because modern brakes are so reliable that is not needed during driving. The primary reason for it being fitted is a back up for use in emergencies if the foot brakes fail.

Serious question, when did you pass your test and how did you pass it not knowing this?
Why post the final sentence?
Because I can’t believe there are people on the road that do not understand the basic controls of their car.

HustleRussell

24,726 posts

161 months

Thursday 5th August 2021
quotequote all
Get out of the wrong side of bed this morning Megaflow?