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Old 09-16-2016, 12:44 PM
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Emergency brake?

For owners of the 2017 Grand Cherokee (I have the Limited), does your emergency brake pedal feel like it needs to be adjusted? I need to press mine almost all the way to the floor in order for it to start working. On my 2014 Limited, all I needed to do was press the e-brake pedal half way down.

Also, I swear I can hear a slight ping under initial light acceleration. This is for the v6. I especially notice it at my work parking garage. Nothing bad, just a faint ping sound for a second just as I am pressing on the gas pedal while moving under 15mph.....windows down of course. Anyone else hear this? Maybe bad tank of gas? I use regular 87 octane.

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Old 09-16-2016, 02:18 PM
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Re: Emergency brake?

Unless I'm mistaken, the pedal is kind of like the shifter: it's just an electronic switch. It's either on or off. There's no adjustment, unlike older systems that pull a wire to engage the brakes.

In other words, you press the pedal until the switch activates and engages the brakes for you, just like the new push button parking brakes.
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Old 09-16-2016, 02:41 PM
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Re: Emergency brake?

Quote:
Originally Posted by NetworkTV View Post
Unless I'm mistaken, the pedal is kind of like the shifter: it's just an electronic switch. It's either on or off. There's no adjustment, unlike older systems that pull a wire to engage the brakes.

In other words, you press the pedal until the switch activates and engages the brakes for you, just like the new push button parking brakes.
My e-brake is in the same location as my 2014 was....far left floor - bottom. Looks like the conventional e-brake, not the electronic version you are referring to like on the Cherokee where it's located near the shifter.
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Old 09-17-2016, 08:20 AM
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Re: Emergency brake?

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Originally Posted by vnbWK2 View Post
My e-brake is in the same location as my 2014 was....far left floor - bottom. Looks like the conventional e-brake, not the electronic version you are referring to like on the Cherokee where it's located near the shifter.
Mine's there too, but I don't think it's a traditional brake with a mechanical linkage anymore. All it does is activate the computer controlled system that allows it to apply the brakes when necessary, such as when stopped on a hill.
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Old 09-17-2016, 08:36 AM
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Re: Emergency brake?

If that's true then I hope it's built to take the force that most people are used to applying to that pedal.
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Old 09-17-2016, 08:49 AM
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Re: Emergency brake?

I just checked the service manual.

It is a totally conventional mechanical linkage emergency brake. No electronics involved.
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Old 09-17-2016, 08:58 AM
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Re: Emergency brake?

yeah totally mechanical. always makes me laugh that half the people I see don't even set them with enough pressure to keep the vehicle from moving, if they hear one click then that's good enough for them lol. I have probably used that thing 2 times in the last 3 years on extreme hills and that's it. in the US people just don't use that thing as a regular as they do overseas
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Old 09-17-2016, 09:06 AM
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Re: Emergency brake?

Quote:
Originally Posted by whitexkr View Post
I just checked the service manual.

It is a totally conventional mechanical linkage emergency brake. No electronics involved.
Thanks for the correction.

For some reason, I was under the impression it just engaged or disengaged an electronic switch - like pretty much everything else.

I though I saw something about it automatically engaging or disengaging under some conditions.

Quote:
Originally Posted by silvermax04 View Post
yeah totally mechanical. always makes me laugh that half the people I see don't even set them with enough pressure to keep the vehicle from moving, if they hear one click then that's good enough for them lol. I have probably used that thing 2 times in the last 3 years on extreme hills and that's it. in the US people just don't use that thing as a regular as they do overseas
Which is precisely why they should just go to push-button controls for them. Then it's on or it's off - not halfway.

The fact is, they aren't "emergency brakes" anymore. Nobody is going to use that foot pedal to attempt to stop the car. It doesn't have enough force to do it anyway since you can drive right off with it one.
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Old 09-17-2016, 10:07 AM
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Re: Emergency brake?

Quote:
Originally Posted by NetworkTV View Post
Thanks for the correction.

For some reason, I was under the impression it just engaged or disengaged an electronic switch - like pretty much everything else.

I though I saw something about it automatically engaging or disengaging under some conditions.


Which is precisely why they should just go to push-button controls for them. Then it's on or it's off - not halfway.

The fact is, they aren't "emergency brakes" anymore. Nobody is going to use that foot pedal to attempt to stop the car. It doesn't have enough force to do it anyway since you can drive right off with it one.
lol yeah its a parking brake but half the population will keep calling it an emergency brake until the end of the earth anyway just like the extended warranty that's really an extended service contract that Jim is always yelling at everyone about.

Years back when I was a little younger I had a car that the master cylinder was beginning to fail on and foolishly I thought I could get home before total pressure failure on the brakes. well I was wrong and the system quickly lost total pressure. The car was an automatic but had a pull rerelease on the emergency brake unlike the push the petal release today. so I used the emergency brake (in that case lol) to meter the pressure on the rear brakes to bring the car to a stop, a longer stopping distance with some back wheels smoking but the car did stop with out hitting the one in front of me. then foolishly again I used the back wheel only braking of the emergency brake to get the car the rest of the way home but I got home fine.

So that parking/emergency brake does serve 2 purposes primarily its a parking brake but also can be used as an emergency brake to give you limited emergency braking if the vehicle had a sudden loss of its primary hydraulic braking. try it on your jeep in a parking lot press the parking/emergency brake down part way and your jeep will slowly come to a stop. though limited there is some braking there for an emergency situation, problem is most people never use enough force on it for parking or emergency to get anything from it. it can lock those back wheels if you use enough force on it which you certainly don't want either.

So what I wonder is when things do go to an ebrake which is all or none it seems, unlike the current mechanical style that you can meter. is it truly only a parking brake at that point or will it retain emergency brake abilities? if the computer locks out the ebrake ability while moving then it truly does become a parking brake only at that point. a step back in my opinion unless that ebrake has got some secondary ability built in to assist in a limited emergency stop. typically you get 70% of stopping from the front wheels and 30% from the back. 30% isn't much but id take that over 0% any day. from experience a total loss of the cars hydraulic braking is not a fun situation to be in
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Old 09-17-2016, 11:26 AM
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Re: Emergency brake?

Quote:
Originally Posted by NetworkTV View Post
Thanks for the correction.

For some reason, I was under the impression it just engaged or disengaged an electronic switch - like pretty much everything else.

I though I saw something about it automatically engaging or disengaging under some conditions.


Which is precisely why they should just go to push-button controls for them. Then it's on or it's off - not halfway.

The fact is, they aren't "emergency brakes" anymore. Nobody is going to use that foot pedal to attempt to stop the car. It doesn't have enough force to do it anyway since you can drive right off with it one.
You are thinking of the hill start feature and several other forms of active braking. Those all use the ABS to perform there function and need power.

The electric parking brakes usually use a motor and needs to not rely on the standard hydraulics. To act as a backup in case hydraulics fail.
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Old 09-17-2016, 12:34 PM
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Re: Emergency brake?

Quote:
Originally Posted by silvermax04 View Post
... that half the people I see don't even set them with enough pressure to keep the vehicle from moving, if they hear one click then that's good enough for them lol.
How many people do you ride with that you can see how much pressure they use when setting the brake? Considering, "in the US people just don't use that thing as a regular ... " I don't know how anybody sets the brake.




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Old 09-17-2016, 02:12 PM
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Re: Emergency brake?

Quote:
Originally Posted by silvermax04 View Post
lol yeah its a parking brake but half the population will keep calling it an emergency brake until the end of the earth anyway just like the extended warranty that's really an extended service contract that Jim is always yelling at everyone about.

Years back when I was a little younger I had a car that the master cylinder was beginning to fail on and foolishly I thought I could get home before total pressure failure on the brakes. well I was wrong and the system quickly lost total pressure. The car was an automatic but had a pull rerelease on the emergency brake unlike the push the petal release today. so I used the emergency brake (in that case lol) to meter the pressure on the rear brakes to bring the car to a stop, a longer stopping distance with some back wheels smoking but the car did stop with out hitting the one in front of me. then foolishly again I used the back wheel only braking of the emergency brake to get the car the rest of the way home but I got home fine.

So that parking/emergency brake does serve 2 purposes primarily its a parking brake but also can be used as an emergency brake to give you limited emergency braking if the vehicle had a sudden loss of its primary hydraulic braking. try it on your jeep in a parking lot press the parking/emergency brake down part way and your jeep will slowly come to a stop. though limited there is some braking there for an emergency situation, problem is most people never use enough force on it for parking or emergency to get anything from it. it can lock those back wheels if you use enough force on it which you certainly don't want either.

So what I wonder is when things do go to an ebrake which is all or none it seems, unlike the current mechanical style that you can meter. is it truly only a parking brake at that point or will it retain emergency brake abilities? if the computer locks out the ebrake ability while moving then it truly does become a parking brake only at that point. a step back in my opinion unless that ebrake has got some secondary ability built in to assist in a limited emergency stop. typically you get 70% of stopping from the front wheels and 30% from the back. 30% isn't much but id take that over 0% any day. from experience a total loss of the cars hydraulic braking is not a fun situation to be in
I get your thinking, but I bet more people leave them engaged accidentally than those that use it for emergencies. In fact, it's the same reason some cars don't even include any sort of spare tire: most people will never have reason to use it. 4x4's and other trucks will probably always have them since they may be in a place AAA can't get to them, but most people aren't going to ever have a desire to change a tire - or know how.

The fact is, braking systems are very reliable and failure is very rare. Further, many parking brakes use the same system as the mains, so it's not the fully mechanical system like you had with drum brakes of years ago. With ABS, traction control and other electronics, the odds that the parking brake is going to be available as an emergency brake if failure occurs is increasingly unlikely.

One thing I will say is I actually attempted to lock up my rears in a parking lot by stomping hard on the "emergency brake" pedal in my last truck. Despite how hard I hit them and the complete lack of weight over the rear wheels, I came nowhere close to locking up the rears.

I would submit that my Saturn from the early 90's was the last car I was successfully able to do that using the hand brake.

Honestly, I'll bet there will come a day there won't even be a parking brake control. It will just simply automatically engage under conditions where the vehicle might roll while the driver is not in the seat.

Push button starters have started to eliminate ignition keys. Fuel injection eliminated the choke. Electronic control of the parking brake might well eliminate the manual control of it.
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