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eBrake failure
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Well last set of traffic lights coming home, pulled switch, no park brake and amber warning.
So read the codes.
Interesting the car has been suffering from unstable cold starts for some months, idle fluctuating for 5-6 seconds then settles. Bit random.
I am beginning to think that ambient temp. sensor is throwing a wobbly.
It was reading 16 degrees, which agrees with the temp. outside. But could be intermittent.
I'm wondering if the knock on effect is the eBrake system is not sure what the ambient temp. is so refusing to operate the brake.
The emergency function works ok, so the switch works.
One ebrake motor on the left did work for a moment, can be seen 20knf. So that's my bank holiday sorted.
Think i will just go to the dealer Tuesday and buy another sensor.
Also cost out motor replacement part.
Actuator counter is also different left and right ("left" on bottom line i think is a Foxwell naming error).
I wonder if the right has been failing to lock.
Temp. sensor and ebrake problem might just be coincidence.
So read the codes.
Interesting the car has been suffering from unstable cold starts for some months, idle fluctuating for 5-6 seconds then settles. Bit random.
I am beginning to think that ambient temp. sensor is throwing a wobbly.
It was reading 16 degrees, which agrees with the temp. outside. But could be intermittent.
I'm wondering if the knock on effect is the eBrake system is not sure what the ambient temp. is so refusing to operate the brake.
The emergency function works ok, so the switch works.
One ebrake motor on the left did work for a moment, can be seen 20knf. So that's my bank holiday sorted.
Think i will just go to the dealer Tuesday and buy another sensor.
Also cost out motor replacement part.
Actuator counter is also different left and right ("left" on bottom line i think is a Foxwell naming error).
I wonder if the right has been failing to lock.
Temp. sensor and ebrake problem might just be coincidence.
- Ole gits rule
- Lifer
- Posts: 4566
- Joined: Sat Oct 24, 2020 5:49 pm
- Location: Pont-y-Pwll
eBrake failure
The brake failure is normally due to poor battery and needs a software update to correct it, normally throws a wheel speed sensor error
M4 Vert in Yas Marina Blue
2011 23i M Sport Highline in Alpine White with Smart Top installed - Gone but not forgotten.
2011 23i M Sport Highline in Alpine White with Smart Top installed - Gone but not forgotten.
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Just ordered some motors and sensor online cheap enough.
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Well will see next week when the parts arrive, i'm not suspecting battery.Ole gits rule wrote: ↑Sat Apr 30, 2022 8:03 pm The brake failure is normally due to poor battery and needs a software update to correct it, normally throws a wheel speed sensor error
- Chippie
- Senior Member
- Posts: 2321
- Joined: Tue Apr 30, 2019 9:11 pm
- Location: Wakefield
eBrake failure
What makes you think it’s not the battery? And how old is it?flybobbie wrote: ↑Sat Apr 30, 2022 8:23 pmWell will see next week when the parts arrive, i'm not suspecting battery.Ole gits rule wrote: ↑Sat Apr 30, 2022 8:03 pm The brake failure is normally due to poor battery and needs a software update to correct it, normally throws a wheel speed sensor error
E89 35is space grey Kansas coral red leather
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Battery about 3 years old.
Have a volt meter fitted always well over 12 volts.
Have a volt meter fitted always well over 12 volts.
- Ole gits rule
- Lifer
- Posts: 4566
- Joined: Sat Oct 24, 2020 5:49 pm
- Location: Pont-y-Pwll
eBrake failure
My car had the brake failure before when I went to pick it up, the garage spent a week trying to fix the issue despite me telling them it needed a new battery and software update.flybobbie wrote: ↑Sat Apr 30, 2022 8:23 pmWell will see next week when the parts arrive, i'm not suspecting battery.Ole gits rule wrote: ↑Sat Apr 30, 2022 8:03 pm The brake failure is normally due to poor battery and needs a software update to correct it, normally throws a wheel speed sensor error
They finally gave up and sent it to BMW and it was sorted with the update and a new battery - your could be very different so you have to try what you feel is going to cure the issue.
M4 Vert in Yas Marina Blue
2011 23i M Sport Highline in Alpine White with Smart Top installed - Gone but not forgotten.
2011 23i M Sport Highline in Alpine White with Smart Top installed - Gone but not forgotten.
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
l tried this morning. Left came on briefly, right never tried.
So the right one has failed.
It can be seen by the actuator count discrepancy on the obd readout that the right has not kept up with the left actuator.
Difference is 92, so for me that is about 10 days driving.
Car has done 95k miles, mainly commuter 15 miles per day.
So averages out ebrake applied every 3 miles.
Can't complain, i have not had to crawl under the car just before MOT to adjust the parking brakes like every other car i have owned..
Don't even mention the stupid design of park brake on Mazda RX-7's, always leaking brake fluid.
So the right one has failed.
It can be seen by the actuator count discrepancy on the obd readout that the right has not kept up with the left actuator.
Difference is 92, so for me that is about 10 days driving.
Car has done 95k miles, mainly commuter 15 miles per day.
So averages out ebrake applied every 3 miles.
Can't complain, i have not had to crawl under the car just before MOT to adjust the parking brakes like every other car i have owned..
Don't even mention the stupid design of park brake on Mazda RX-7's, always leaking brake fluid.
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Well all sotrted.
Replaced temp. sensor. Cleared the codes.
Might have made some difference.
First time for a while i have seen 32mpg on spirited drive home.
Next replaced both ebrake motors.
Had to operate the ebrake switch several times in order to allow the code reader to erase errors, although they went away on car no problem.
So reader was only needed to clear the historic error.
Took some multimeter reading on the motor gearbox contacts, someone without code reader might find useful. Can see the faulty motor showing 4.8 k ohm across outside contacts.
When i have more time i will cut the faulty one open, see what's inside.
Replaced temp. sensor. Cleared the codes.
Might have made some difference.
First time for a while i have seen 32mpg on spirited drive home.
Next replaced both ebrake motors.
Had to operate the ebrake switch several times in order to allow the code reader to erase errors, although they went away on car no problem.
So reader was only needed to clear the historic error.
Took some multimeter reading on the motor gearbox contacts, someone without code reader might find useful. Can see the faulty motor showing 4.8 k ohm across outside contacts.
When i have more time i will cut the faulty one open, see what's inside.
- Chippie
- Senior Member
- Posts: 2321
- Joined: Tue Apr 30, 2019 9:11 pm
- Location: Wakefield
eBrake failure
It’s good to see you got it sorted and thanks for posting results
E89 35is space grey Kansas coral red leather
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
I did measure the temperature sensor, it was 4k ohm at 20 degrees.
The old one seemed fine, but the new one allowed me to cancel it's faults, so something was wrong with it.
The old one seemed fine, but the new one allowed me to cancel it's faults, so something was wrong with it.
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Seems corrosion killed it.
There is a rubber O ring when fitted to the caliper. Moisture must still get in.
Not sure if some rubber safe grease would do no harm to keep moisture out.
Only connection to outside world is the clearance around the planetary gear housing.There is a rubber O ring when fitted to the caliper. Moisture must still get in.
Not sure if some rubber safe grease would do no harm to keep moisture out.
- B21
- Lifer
- Posts: 5457
- Joined: Tue Oct 05, 2021 7:15 pm
- Location: In my Banana Yellow Space Shuttle...somewhere over Southern Caledonia
eBrake failure
I had one fail..the plastic casing had a micro crack in which allowed water to enter..full of rusty water..
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard…
A very modified Atacama Yellow 35is
A very modified Atacama Yellow 35is
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- Lifer
- Posts: 4048
- Joined: Sat May 25, 2013 8:27 pm
- Location: Stourbridge
eBrake failure
Seen it on street electrical equipment. Component gets warm, air inside expands escapes through micro gaps..
As it cools draws in moisture and cycle repeats. Like a thermal pump.
Open up to find condensation inside and rusty electrics.
As it cools draws in moisture and cycle repeats. Like a thermal pump.
Open up to find condensation inside and rusty electrics.