My rear pads needed replacing.... that's what the idiot light on my dash was alerting me to .... worn pads.....
To quote @MidnightTouaregV8
1st clue
The wrenching commences... everything goes fairly smoothly, except I'm unable to remove and transfer the inspection screws from the old rotor over to the new units (rusted like MOFOs).....
The EPB is left OFF.... it is not actuated, touched, anything.
The ebrake shoes\hardware is also left alone......
(although, I should've replaced everything as the linings are worn and everything is super rusty)
Everything is reassembled, vehicle is started.... EPB is cycled on and off... tested... everything holds.
That was easy.... or was it?
I go to drive away, and within 10 ft of rolling off the start, the cluster goes ape and starts screaming about EPB faults, Auto-Hold faults, etc. (I don't even have Auto-Hold) 🤬
I've already burnt up my wrench time for the day, so I say efff this and go on..... well.... the annoying warnings, both visual and audible don't just go away... no.... they keep at it.... driving you nuts..... the only time they "pause" is once you get up to over 60kph in speed.... at that point, they will STFU until you slow down again or stop.... and then it's ON once again.
As I am perplexed to how this could've happened, I start jumping to all kind of conclusions prior to actually diagnosing anything..... I'm telling myself how the controller lost its coding and how I will just have to pull it from a past scan record... no biggie right? WRONG!
So the next day, I get back into it and start looking into WHY this is happening.
First thing, let's scan this to see WTF is going on.
OK.... so seems like the coding wasn't lost.... I verify that it's still the same as it was in previous scans, all good.
Due the the reported codes, I look into some values
All seems well, no malfunction, air gaps are in spec.... W T F is going on? 😵
I decide to look into "grind in stats", and sure thing, the system is reporting that Grind-In Procedure has not been started or completed, and that something like a 222m grind in distance is required. (sorry, didn't save log of it)
Crap.... I guess I'll do the grind-in so that I can do the basic setting and make the system happy.
So I go through the process, as documented on the RT wiki, etc.
Grind-in completed & sufficient... sweet.
I go ahead and perform airgap calibration, as documented on the RT wiki, and it completes successfully..... sweet.
I exit the controller, clear codes, go back in controller, no codes.... sweet.
Lastly, I cycle the ignition, and BAM..... ERRORS ARE STILL THERE. 🤬
RAGE!
So let's dig some more.
Cycling EPB.....
Frustrated, I decide I'm going to do another grind-in and calibration, because I must've screwed something up during the prior attempt.... so I go through all that again, everything works again, cycle ignition... and still NFG.
Same errors..... 🤬
Since I can't see anything wrong, I decide to look into additional values....
Well, crap... look at that... my air gaps are way out of range! (I would've known that if I was paying attention to what the code description was telling me, but I stopped reading at "NO CALIBRATION".... just like a donkey!
Excellent... now we know what the issue is.
So, time to rip the wheels off again, rotate the rotors so that they are in the correct position, and start to adjust the air gaps as per manual......
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So I start making adjustments, and after a handful of turns, I go back to VCDS, cycle the EPB about 3 times and take new readings.
Ok... looks like I'm going down the right path.... continuing.....
Bunch more adjustments
OK... we are in spec... time to put the wheels back on and redo the grind-in and calibration..... but first, lets check for codes.
OH... look at that... bunch more codes.... why?
Well, it turns out reading is important.... and so is battery voltage, as the EPB system does not like low voltages... and I've been draining the battery by leaving ignition on, lights, running my laptop off the inverter, cycling the EPB about a dozen times, etc. all while making the physical air gap adjustments outside......
So... if you're going to do this, I strongly suggest throwing a battery charger\maintainer on the egg while wrenching.
Anyways, I reassemble everything, clear codes, go do another grind-in, do another calibration, clear codes again, cycle the ignition, and BAM.... everything is good again.
Last gap check.
Fault code check.
In conclusion, I suspect that the aftermarket rotors are manufactured to a way more relaxed tolerance, and as such, the diameter of the drum is way larger than the OEM spec.... this would explain why my gaps went to crap without anyone touching anything after simply replacing the rotors.
Lesson learned.... either check with a caliper that whatever parts you're putting on are the same diameter,
OR
Immediately after replacing the parts, cycle the EPB several times prior to putting the rear wheels back on. After these cycles, ensure that you use VCDS to check that air gaps are in spec, and if required adjust to be in spec.
If you skip any of that, you'll end up having to do grind-in and calibration on top of having to do air gap adjustments.
And now, tagging @Lifecrane who won't bother reading or following any of this stuff to solve his issues, but will more than likely reply with something to do about a GF, CD or some parasitic drain of his system.
To quote @MidnightTouaregV8
So I suspected it was the rears, because I had already replaced the front disks and pads about 2 years ago, but at that time, there was still plenty of life left in the rears, so I left them alone. I also had the parts still kicking around as I had bough a complete "aftermarket" set of cheap brakes to try out.....
1st clue
The wrenching commences... everything goes fairly smoothly, except I'm unable to remove and transfer the inspection screws from the old rotor over to the new units (rusted like MOFOs).....
The EPB is left OFF.... it is not actuated, touched, anything.
The ebrake shoes\hardware is also left alone......
(although, I should've replaced everything as the linings are worn and everything is super rusty)
Everything is reassembled, vehicle is started.... EPB is cycled on and off... tested... everything holds.
That was easy.... or was it?
I go to drive away, and within 10 ft of rolling off the start, the cluster goes ape and starts screaming about EPB faults, Auto-Hold faults, etc. (I don't even have Auto-Hold) 🤬
I've already burnt up my wrench time for the day, so I say efff this and go on..... well.... the annoying warnings, both visual and audible don't just go away... no.... they keep at it.... driving you nuts..... the only time they "pause" is once you get up to over 60kph in speed.... at that point, they will STFU until you slow down again or stop.... and then it's ON once again.
As I am perplexed to how this could've happened, I start jumping to all kind of conclusions prior to actually diagnosing anything..... I'm telling myself how the controller lost its coding and how I will just have to pull it from a past scan record... no biggie right? WRONG!
So the next day, I get back into it and start looking into WHY this is happening.
First thing, let's scan this to see WTF is going on.
Code:
Address 53: Parking Brake Labels: 7P0-907-801.clb
Control Module Part Number: 7P0 907 801 F HW: 7P0 907 801 F
Component and/or Version: EPB H51 1201
Software Coding: 01040200
Work Shop Code: WSC 31414 790 00001
ASAM Dataset: EV_ParkbA7 000006 (VW52)
ROD: EV_ParkbA7.rod
VCID: B6690D0909D17A21A9-80E2
2 Faults Found:
0025 - No Calibration
B2010 F0 [00001000] - Deviation from Expected Range
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 218
Mileage: 203519 km
Date: 2024.04.13
Time: 14:29:19
Voltage: 14.6 V
0024 - No Basic Setting
B2010 00 [00001001] - -
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 217
Mileage: 203515 km
Date: 2024.04.13
Time: 14:21:07
Voltage: 14.8 VDue the the reported codes, I look into some values
Code:
IDE02712-IDE05270 System conditions-Parking brake motors: malfunction status No malfunction detected
IDE04435-MAS01849 Air gap-Left 2.008 mm
IDE04435-MAS01850 Air gap-Right 2.132 mm
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 6.188 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 5.849 mmI decide to look into "grind in stats", and sure thing, the system is reporting that Grind-In Procedure has not been started or completed, and that something like a 222m grind in distance is required. (sorry, didn't save log of it)
Crap.... I guess I'll do the grind-in so that I can do the basic setting and make the system happy.
So I go through the process, as documented on the RT wiki, etc.
Grind-in completed & sufficient... sweet.
I go ahead and perform airgap calibration, as documented on the RT wiki, and it completes successfully..... sweet.
I exit the controller, clear codes, go back in controller, no codes.... sweet.
Lastly, I cycle the ignition, and BAM..... ERRORS ARE STILL THERE. 🤬
RAGE!
So let's dig some more.
Cycling EPB.....
Code:
IDE02712-IDE05270 System conditions-Parking brake motors: malfunction status No malfunction detected
IDE04435-MAS01849 Air gap-Left 2.008 mm
IDE04435-MAS01850 Air gap-Right 2.132 mm
IDE05267-MAS01849 Electro-mechanical parking brake: tensioning force-Left 3579 N
IDE05267-MAS01850 Electro-mechanical parking brake: tensioning force-Right 3597 N
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 6.188 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 5.849 mm
ENG109099-MAS01849 Actuator status-Left closed
ENG109099-MAS01850 Actuator status-Right closed
Code:
IDE02712-IDE05270 System conditions-Parking brake motors: malfunction status No malfunction detected
IDE04435-MAS01849 Air gap-Left 2.008 mm
IDE04435-MAS01850 Air gap-Right 2.132 mm
IDE05267-MAS01849 Electro-mechanical parking brake: tensioning force-Left -2008 N
IDE05267-MAS01850 Electro-mechanical parking brake: tensioning force-Right -2132 N
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 0.000 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 0.000 mm
ENG109099-MAS01849 Actuator status-Left Open
ENG109099-MAS01850 Actuator status-Right OpenSame errors..... 🤬
Since I can't see anything wrong, I decide to look into additional values....
Code:
IDE04435-MAS01849 Air gap-Left 4.377 mm
IDE04435-MAS01850 Air gap-Right 4.255 mm
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 0.000 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 0.000 mm
IDE05272-MAS01849 Air gap before calibration-Left 4.624 mm
IDE05272-MAS01850 Air gap before calibration-Right 4.318 mmExcellent... now we know what the issue is.
So, time to rip the wheels off again, rotate the rotors so that they are in the correct position, and start to adjust the air gaps as per manual......
So I start making adjustments, and after a handful of turns, I go back to VCDS, cycle the EPB about 3 times and take new readings.
Code:
IDE02712-IDE05270 System conditions-Parking brake motors: malfunction status No malfunction detected
IDE04435-MAS01849 Air gap-Left 4.377 mm
IDE04435-MAS01850 Air gap-Right 4.255 mm
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 0.000 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 0.000 mm
IDE05272-MAS01849 Air gap before calibration-Left 3.046 mm
IDE05272-MAS01850 Air gap before calibration-Right 2.062 mmBunch more adjustments
Code:
IDE02712-IDE05270 System conditions-Parking brake motors: malfunction status No malfunction detected
IDE04435-MAS01849 Air gap-Left 4.377 mm
IDE04435-MAS01850 Air gap-Right 4.255 mm
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 4.478 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 4.491 mm
IDE05272-MAS01849 Air gap before calibration-Left 2.148 mm
IDE05272-MAS01850 Air gap before calibration-Right 2.118 mm
Code:
Address 53: Parking Brake Labels: 7P0-907-801.clb
Control Module Part Number: 7P0 907 801 F HW: 7P0 907 801 F
Component and/or Version: EPB H51 1201
Software Coding: 01040200
Work Shop Code: WSC 31414 790 00001
ASAM Dataset: EV_ParkbA7 000006 (VW52)
ROD: EV_ParkbA7.rod
VCID: B6690D0909D17A21A9-80E2
5 Faults Found:
0052 - Parking Brake Motor; Right
C10BD 07 [00001000] - Mechanical Failure
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 219
Mileage: 203556 km
Date: 2024.04.14
Time: 12:47:03
Voltage: 10.2 V
0024 - No Basic Setting
B2010 00 [00001001] - -
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 219
Mileage: 203556 km
Date: 2024.04.14
Time: 12:22:07
Voltage: 12.2 V
0025 - No Calibration
B2010 F0 [00001001] - Deviation from Expected Range
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 219
Mileage: 203556 km
Date: 2024.04.14
Time: 13:25:24
Voltage: 13.4 V
0051 - No Calibration
B2010 F0 [00001001] - Deviation from Expected Range
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 219
Mileage: 203556 km
Date: 2024.04.14
Time: 12:47:27
Voltage: 11.4 V
0004 - Parking Brake Motor; Left
C10BC 07 [00001001] - Mechanical Failure
[New feature! Extended UDS fault detail is only supported by current gen. interfaces]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Frequency: 1
Reset counter: 219
Mileage: 203556 km
Date: 2024.04.14
Time: 13:03:49
Voltage: 9.8 VWell, it turns out reading is important.... and so is battery voltage, as the EPB system does not like low voltages... and I've been draining the battery by leaving ignition on, lights, running my laptop off the inverter, cycling the EPB about a dozen times, etc. all while making the physical air gap adjustments outside......
So... if you're going to do this, I strongly suggest throwing a battery charger\maintainer on the egg while wrenching.
Anyways, I reassemble everything, clear codes, go do another grind-in, do another calibration, clear codes again, cycle the ignition, and BAM.... everything is good again.
Last gap check.
Code:
IDE02712-IDE05270 System conditions-Parking brake motors: malfunction status No malfunction detected
IDE04435-MAS01849 Air gap-Left 2.071 mm
IDE04435-MAS01850 Air gap-Right 2.105 mm
IDE05268-MAS01849 Electro-mech parking brake: position of parking brake motors-Left 0.000 mm
IDE05268-MAS01850 Electro-mech parking brake: position of parking brake motors-Right 0.000 mm
IDE05272-MAS01849 Air gap before calibration-Left 2.071 mm
IDE05272-MAS01850 Air gap before calibration-Right 2.105 mm
Code:
53-Parking Brake -- Status: OK 0000
Address 53: Parking Brake (J540-) Labels:| 7P0-907-801.clb
Part No SW: 7P0 907 801 F HW: 7P0 907 801 F
Component: EPB H51 1201
Revision: 00000000 Serial number: C1451300316 Dataset Number: A001
Coding: 01040200
Shop #: WSC 31414 790 00001
ASAM Dataset: EV_ParkbA7 000006
ROD: EV_ParkbA7.rod
VCID: B6690D0909D17A21A9-80E2
Slave 3:
No fault code found.Lesson learned.... either check with a caliper that whatever parts you're putting on are the same diameter,
OR
Immediately after replacing the parts, cycle the EPB several times prior to putting the rear wheels back on. After these cycles, ensure that you use VCDS to check that air gaps are in spec, and if required adjust to be in spec.
If you skip any of that, you'll end up having to do grind-in and calibration on top of having to do air gap adjustments.
And now, tagging @Lifecrane who won't bother reading or following any of this stuff to solve his issues, but will more than likely reply with something to do about a GF, CD or some parasitic drain of his system.
