Parking Brake Sticking, Now Clunking Sound and Ford Roadside on Speed Dial

BMT1071

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Does the MME use the caliper for the parking brake, or a drum-in-hat design?
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Vecii

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Dont forget, if you don't use them they will seize so it's better to use them even when not necessary because the day you do need them, you want to make sure they work. The last thing you want to see is your car rolling down a hill or into your garage door.
In the same line of thought, we have learned that it is good practice to pull the pads and clean the calipers at least once a year, especially if you live in an area that salts the roads. Using the one pedal driving does not allow the pads to slide as much and more road grime and corrosion will build up on the calipers.
 

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I had this happen once, and it was after I drove in the rain. Like the brake kind of froze in place. Has not happened since so I suspect it just happened due to being applied to wet pads and it 'stuck'.

Will be interested to see what Ford tells you. As long as it doesn't hurt the car it won't bug me.
No rain and sunny 70s weather and outdoors - I heard the thumping noise twice in short during yesterday while backing/reversing the car and had to stop by using the brakes. My autohold is ON - so I am not what happened but it was loud enough that the passengers thought I hit something but I knew I did not. Did not hear that again - I thought it was odd but this thread makes me think I may have slammed the brakes hard enough to stick or the weight of the vehicle just makes that noise when auto hold is ON?
 

kdryden99

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No rain and sunny 70s weather and outdoors - I heard the thumping noise twice in short during yesterday while backing/reversing the car and had to stop by using the brakes. My autohold is ON - so I am not what happened but it was loud enough that the passengers thought I hit something but I knew I did not. Did not hear that again - I thought it was odd but this thread makes me think I may have slammed the brakes hard enough to stick or the weight of the vehicle just makes that noise when auto hold is ON?
It might be a by product of the auto hold. But it seems this occurs mostly when the car is parked for a long time. But if you are in stop and go traffic discs are hot and not being used, all you need is one slam of the brakes and theyll stick. I hope they put enough anti-seize?! I'll see once I get my car.
 

sockmeister

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So I park the MME ( FE, AWD ER) in my garage, twice when I released the parking brake and gently applied the accelerator pedal, nothing happened, double check and yes parking brake is off, apply slightly more pressure to accelerator and "thunk!" The car moves. The first time the car was fine after that - no more symptoms. I have experienced this before when wet brakes sit and dry in the garage. Add on Covid and only going into the office twice a week...hmmm

Today was the second time and when we backed out it was making a rhythmic thunking sound like it had a flat tire as we pulled from the driveway. Needless to say, I went back into the driveway and I will call Ford to come get it in the morning.

Any ideas? Did I dislodge the parking brake?
It's not uncommon on non-EV cars for the parking brake to "freeze" to the rotors (via rust) when it sits while it's applied -- especially if it's applied while the rotors are hot or if it's left on for a while.

When you release the E-Brake electronically, the tension on it is released, but if the pad's frozen in place, it won't release itself.
When you first start moving after that, it'll "pop" back into its off position, since the movement of the rotor has forced it to dislodge.

In other words, this is normal and isn't anything to worry about, in my opinion.
 
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sockmeister

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Does the MME use the caliper for the parking brake, or a drum-in-hat design?
Don't know for sure, but on my past Mustangs, it uses the actual rear brake pad. There's another tensioner on the caliper that forces the pad onto the rotor.
 
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Thank you all for the replies - I appreciate being able to tap the minds of the forum! For now, this is a watch and see, the thunking disappeared and I had a chat with the service manager at my dealer. If I notice it again, I will have them give it a once over to ensure the parking brake tensioner doesn't need adjustment or the pad needs to be reseated. Right now I am only driving it twice a week ?, my office will not expand to regular work weeks for months it seems... LOL, I need to become a Sunday driver!
 

Superdeg

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I had a similar experience only worse. Front right caliper locked up. Had it towed to the dealer. Rotor and pads are ruined, dealer trying to find parts. Not sure of cause at this point, dealer thinks might be something in the regenerative breaking system. Dealer is being super nice, put me in a rental because they just do not know when it will be fixed.
 

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I had a similar experience only worse. Front right caliper locked up. Had it towed to the dealer. Rotor and pads are ruined, dealer trying to find parts. Not sure of cause at this point, dealer thinks might be something in the regenerative breaking system. Dealer is being super nice, put me in a rental because they just do not know when it will be fixed.
If locked up did they say anything about the calipers? Was it the pad that fused with the disc or the caliper that stuck? If its the pad that froze then strongly suggest everyone to not depend on 1pd only at the beginning. At least for the first couple of hundred miles.
 

Dave

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We had this happen to us also and had Ford roadside tow to the dealership they were able to replicate the problem the next morning however the problem went away and nothing was done except a few updates which I don't think had anything to do with the brakes.

Ford Mustang Mach-E Parking Brake Sticking, Now Clunking Sound and Ford Roadside on Speed Dial 20210318_081005
 

Timelessblur

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It might be a by product of the auto hold. But it seems this occurs mostly when the car is parked for a long time. But if you are in stop and go traffic discs are hot and not being used, all you need is one slam of the brakes and theyll stick. I hope they put enough anti-seize?! I'll see once I get my car.
I have had the thunk like thing happen on other cars I owned. I noticed it more often with my Sentra SE-R I had back in the 2000's because I used the parking brake a lot more on that car but I did have it happen a few times to my Honda Crosstour as well. It would generally happen if I drove in some weather and then the car would sit for a few days. When I first would move the car there would be thunk and I would need to give the car a little power to move then it was fine. My guess was it was a little rust on the rotors would be stick to the pads. After few wheel turns the rust would be scrapped off and everything was fine.
I would not be surprised at all to learn it is something like that causing it.
 
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RockDaphne98296

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We had this happen to us also and had Ford roadside tow to the dealership they were able to replicate the problem the next morning however the problem went away and nothing was done except a few updates which I don't think had anything to do with the brakes.

20210318_081005.jpg
Wow! that is my car exactly! Hmmm....
 

Superdeg

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If locked up did they say anything about the calipers? Was it the pad that fused with the disc or the caliper that stuck? If its the pad that froze then strongly suggest everyone to not depend on 1pd only at the beginning. At least for the first couple of hundred miles.
Dealer said the caliper was defective, he knew of one other instance of this with a MME.
 

kdryden99

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Dealer said the caliper was defective, he knew of one other instance of this with a MME.
I was goig to say if the pad stuck it wouldnt prevent you from driving but if the slider pin or piston stuck that would definetely prevent you from moving. Wonder if this is a general defect or isolated case. we'll have to keep an eye on this one
 

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My car starting making a thumping sound yesterday. It was the first time It was driven since washing the car on Monday. I tried the suggestions on this thread to no avail last night. This morning I took it out for a short, more spirited ride (1/2 mile, 60 mph w/ hard braking) this morning. The thumping was much better but not totally gone. Another quick ride and it solved the problem. Sure would like to know the specific cause. Thanks to everyone that shared their experiences.

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