2010 c300 4matic sport
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2010 e350, 2015 glk350 2010 c300, 2004 bmw 530 6speed , 1993 vw corrado, 1997f150
You have 100% of the braking system replaced :
It's really time to put on thinking cap to inspect these brakes. Replacing good part does not help fix issues.
Eventually you will note that all brake pads normally leak rotors without abnormal dragging effect.
You finding rear calipers filled with air... points to poor service procedure.
Get a "pressure fill system" to flush out all air bubbles.
- The ABS/ESP controller
- the master cylinder
- all wheel calipers
- all flexible brake lines
- all pads/springs
It's really time to put on thinking cap to inspect these brakes. Replacing good part does not help fix issues.
Eventually you will note that all brake pads normally leak rotors without abnormal dragging effect.
You finding rear calipers filled with air... points to poor service procedure.
Get a "pressure fill system" to flush out all air bubbles.
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Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Simple Freeplay Tip
Trust that cap has been on long ago, it makes no sense at all that I am still having issues and yeah the parts cannon is empty. I only did the abs controller because of the previous error of a low voltage issue to the pump last time it messed up when I drove it. Been reading and researching and they say the control module fails on these alot because the connector pins are not soldered in only press fit so gonna open the old unit and solder all the press fit connections and have a spare just in case. I have a power bleeder so I will be doing that this week then finding a patch of grass or gravel and see if the abs kicks in on a hard panic stop.
I am very disappointed in the dealer and the indy shop that claimed and charged for work not performed. I always get my parts back but you still never know
I am very disappointed in the dealer and the indy shop that claimed and charged for work not performed. I always get my parts back but you still never know
Inspect and diagnose each brake set while forcing all the air out. Don't let DOT-3 tank run low...
While in there inspect freeplay in the wheel bearings ajustement.
The pads are mounted to the caliper/carrier on spindle while the rotor is attached to the hub meaning brakes work across wheel bearings.
Freeplay = poor brakes!
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2010 e350, 2015 glk350 2010 c300, 2004 bmw 530 6speed , 1993 vw corrado, 1997f150
Okay, no cigar yet again replaced missing spring on rear passenger as it was missing, gravity bled then power bled entire system again. With all four wheels off the ground on jack stands all four wheels spin freely and no errors when scanned with autel or Mercedes scanner drove the car for about 15 minutes limited my braking at first then slammed on brakes to activate abs which worked perfectly and brakes stop as normal, but could seemingly feel the wheels starting to drag again, then got a tire pressure monitor inoppertive , no wheel sensors error no esc or triangle or abs error. Got back to mother's house only do about a 3 to 4 mile circle in case 8 have to huff it back home , but seems to be the sweet spot as far as distance and speed around 60 mp. Once home quickly grabbed the jack raised the rear and both wheels were jammed stuck could not even force to turn, then quickly jacked the front , slam locked up just like the rear.
So it is all four that is dragging once it starts . It started pouring rain so i did not get a chance to crack open the bleeder and see if the whell let go. Will try that tomorrow. So what in the system can be telling the system or module to use the brakes. I am probably gonna put it back in the shop one last time if I can not figure it out soon. But dang I almost stumped gonna borrow my daughter's tpms reset tool and see if that can get a reading from the sensors, although I dont think tpms can make a cars brake when not asked or can it ? Also the no wheel sensors error is that wheel speed sensor or tpms sensor
So it is all four that is dragging once it starts . It started pouring rain so i did not get a chance to crack open the bleeder and see if the whell let go. Will try that tomorrow. So what in the system can be telling the system or module to use the brakes. I am probably gonna put it back in the shop one last time if I can not figure it out soon. But dang I almost stumped gonna borrow my daughter's tpms reset tool and see if that can get a reading from the sensors, although I dont think tpms can make a cars brake when not asked or can it ? Also the no wheel sensors error is that wheel speed sensor or tpms sensor
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
GREAT UNTIL HOME
Okay, no cigar yet again replaced missing spring on rear passenger as it was missing, gravity bled then power bled entire system again. With all four wheels off the ground on jack stands all four wheels spin freely and no errors when scanned with autel or Mercedes scanner drove the car for about 15 minutes limited my braking at first then slammed on brakes to activate abs which worked perfectly and brakes stop as normal, but could seemingly feel the wheels starting to drag again, then got a tire pressure monitor inoppertive , no wheel sensors error no esc or triangle or abs error. Got back to mother's house only do about a 3 to 4 mile circle in case 8 have to huff it back home , but seems to be the sweet spot as far as distance and speed around 60 mp. Once home quickly grabbed the jack raised the rear and both wheels were jammed stuck could not even force to turn, then quickly jacked the front , slam locked up just like the rear.
So it is all four that is dragging once it starts . It started pouring rain so i did not get a chance to crack open the bleeder and see if the whell let go. Will try that tomorrow. So what in the system can be telling the system or module to use the brakes. I am probably gonna put it back in the shop one last time if I can not figure it out soon. But dang I almost stumped gonna borrow my daughter's tpms reset tool and see if that can get a reading from the sensors, although I dont think tpms can make a cars brake when not asked or can it ? Also the no wheel sensors error is that wheel speed sensor or tpms sensor
So it is all four that is dragging once it starts . It started pouring rain so i did not get a chance to crack open the bleeder and see if the whell let go. Will try that tomorrow. So what in the system can be telling the system or module to use the brakes. I am probably gonna put it back in the shop one last time if I can not figure it out soon. But dang I almost stumped gonna borrow my daughter's tpms reset tool and see if that can get a reading from the sensors, although I dont think tpms can make a cars brake when not asked or can it ? Also the no wheel sensors error is that wheel speed sensor or tpms sensor
TPMS sensors are on a separate module.
Your brakes worked perfectly as you road tested them all the way until at home where wheels got stuck.
You raised the rear axle that was locked and then also the front axle that was also found locked as follow...
Once home quickly grabbed the jack raised the rear and both wheels were jammed stuck could not even force to turn, then quickly jacked the front , slam locked up just like the rear.
Are you familiar with the "PRND" gear selection on a Mercedes 4Matic?Last edited by CaliBenzDriver; Jun 14, 2025 at 04:46 AM.
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2010 e350, 2015 glk350 2010 c300, 2004 bmw 530 6speed , 1993 vw corrado, 1997f150
Lets unbundle everything to only deal with brakes.
TPMS sensors are on a separate module.
Your brakes worked perfectly as you road tested them all the way until at home where wheels got stuck.
You raised the rear axle that was locked and then also the front axle that was also found locked as follow...
TPMS sensors are on a separate module.
Your brakes worked perfectly as you road tested them all the way until at home where wheels got stuck.
You raised the rear axle that was locked and then also the front axle that was also found locked as follow...
Once home quickly grabbed the jack raised the rear and both wheels were jammed stuck could not even force to turn, then quickly jacked the front , slam locked up just like the rear.
Are you familiar with the "PRND" gear selection on a Mercedes 4Matic?I was asking because of the no wheel sensor error, was it a wheel speed error or or a wheel air error. I have two other benz 2010 e350 4matic and a 2015 glk 350 4matic and have scanned them both while driving a get pretty much the same live data readings on sensors brake pressures, and switch activations.
At 60 and a person that has literally rebuilt engines, tranny, cluthes, and trouble shot electronics to board level repair, while not acting like i know it all i am pretty good with this kind of thing normally this one just does not add up, and i have tried two repair shops one being the dealer and the other being a bmw, audi, Mercedes specific independent shop and i get the car back saying its fixed or they want to open parts cannon , all of which unfortunately I have done also.
I appreciate your help in trying to figure out this issue bu it won't be posting my issues or scenarios of testing again as they seem to get under your skin or tool box a bit , again thanks for your help and contribution to this forum
Out Of Control!!
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
UNUSUAL MIX UP
lol yes I am i think, wondered about that also, but here is the question then why did they turn freely in park before I drove the car?
Each axel turned with no resistance each wheel turned freely until after I drove it.
After about 15 minutes in the air I could then spin each axel again while the car was in park.
Again it started storming so no further testing was done. And I also do understand that abs and tpms are different modules and differnt things all together but not sure if they in sone way work together and do sone sort of active braking thing. .
I was asking because of the no wheel sensor error, was it a wheel speed error or or a wheel air error. I have two other benz 2010 e350 4matic and a 2015 glk 350 4matic and have scanned them both while driving a get pretty much the same live data readings on sensors brake pressures, and switch activations.
At 60 and a person that has literally rebuilt engines, tranny, cluthes, and trouble shot electronics to board level repair, while not acting like i know it all i am pretty good with this kind of thing normally this one just does not add up, and i have tried two repair shops one being the dealer and the other being a bmw, audi, Mercedes specific independent shop and i get the car back saying its fixed or they want to open parts cannon , all of which unfortunately I have done also.
I appreciate your help in trying to figure out this issue bu it won't be posting my issues or scenarios of testing again as they seem to get under your skin or tool box a bit , again thanks for your help and contribution to this forum
Each axel turned with no resistance each wheel turned freely until after I drove it.
After about 15 minutes in the air I could then spin each axel again while the car was in park.
Again it started storming so no further testing was done. And I also do understand that abs and tpms are different modules and differnt things all together but not sure if they in sone way work together and do sone sort of active braking thing. .
I was asking because of the no wheel sensor error, was it a wheel speed error or or a wheel air error. I have two other benz 2010 e350 4matic and a 2015 glk 350 4matic and have scanned them both while driving a get pretty much the same live data readings on sensors brake pressures, and switch activations.
At 60 and a person that has literally rebuilt engines, tranny, cluthes, and trouble shot electronics to board level repair, while not acting like i know it all i am pretty good with this kind of thing normally this one just does not add up, and i have tried two repair shops one being the dealer and the other being a bmw, audi, Mercedes specific independent shop and i get the car back saying its fixed or they want to open parts cannon , all of which unfortunately I have done also.
I appreciate your help in trying to figure out this issue bu it won't be posting my issues or scenarios of testing again as they seem to get under your skin or tool box a bit , again thanks for your help and contribution to this forum
You say that wheel gets stuck at home and other times they spin freely while in Park: "THEY TURN FREELY IN PARK" -
I have a hard time with that.
This sounds more related to a transmission issue than brakes.
The only remaining brake assembly are your ABS valves have not been replaced...
I can see one valve getting marginal but not all. So unlikely.
You need to troubleshoot why you wheels spin in Park and get stock other times..."PRND".
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Last edited by CaliBenzDriver; Jun 14, 2025 at 10:39 PM.
Thread Starter
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Joined: Jun 2023
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2010 e350, 2015 glk350 2010 c300, 2004 bmw 530 6speed , 1993 vw corrado, 1997f150
Well I'm about to light a cigar , if the test drive goes as planned today like it did yesterday, I replaced the pump power bled the system again and test drove. At first the brakes still dragged and felt stronger than ever stopping the car so I jammed on the brakes and few times from 60 and all of a sudden they released and stopped dragging. I drove the car for about 45 minutes on and off the brakes and it ran perfectly, so looks like the actual pump was bad even though the abs was working in it and no errors.. As far as the wheels turning in park it seems it will do that if both wheels on the same axel are off the ground at the same time, the differential allows that to happen one turns one way while other the opposite direction, but if one on the ground same axel you can not atleast while in
Park. I again thank you fir chimming in with ideas, and if it returns i will let the forum know.
Park. I again thank you fir chimming in with ideas, and if it returns i will let the forum know.
Out Of Control!!
Joined: Apr 2019
Posts: 11,924
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
ABS PUM SWAP
Well I'm about to light a cigar , if the test drive goes as planned today like it did yesterday, I replaced the pump power bled the system again and test drove. At first the brakes still dragged and felt stronger than ever stopping the car so I jammed on the brakes and few times from 60 and all of a sudden they released and stopped dragging. I drove the car for about 45 minutes on and off the brakes and it ran perfectly, so looks like the actual pump was bad even though the abs was working in it and no errors..
As far as the wheels turning in park it seems it will do that if both wheels on the same axel are off the ground at the same time, the differential allows that to happen one turns one way while other the opposite direction, but if one on the ground same axel you can not atleast while in
Park. I again thank you fir chimming in with ideas, and if it returns i will let the forum know.
As far as the wheels turning in park it seems it will do that if both wheels on the same axel are off the ground at the same time, the differential allows that to happen one turns one way while other the opposite direction, but if one on the ground same axel you can not atleast while in
Park. I again thank you fir chimming in with ideas, and if it returns i will let the forum know.
Your ABS pump itself was bad regardless of ESP control module being replaced once already.
Defective hydraulic pump without fault.
The pump itself is part of the ESP valve-body, the very last unit that was never replaced.
It's odd ESP control module never pulled any fault for pressure issues. It's loaded with line pressure sensors...
Good call then.
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Thread Starter
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Joined: Jun 2023
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2010 e350, 2015 glk350 2010 c300, 2004 bmw 530 6speed , 1993 vw corrado, 1997f150
Okay guys i know it's been a while, I just had to get away from it for a while but it is fixed now for sure and with all that the things replaced it was the after market master cylinder. I followed service data tested the brake booster and check valve they tested good then I disconnected the booster vacuum line and drove the car for couple hours no brake binding of course I needed increased foot strength to stop car but no lock up. What seemed to be the issue with the master cylinder is it had a pin located in the rear chamber that I think allows fluid to return to the reservoir after the brakes are released , the aftermarket one has the pin but it also had some kind of shipping cover inside the hole holding the pin down so fluid could not quickly leave the lines, I replaced it with ate factory brand it had the pin but not the pin holder so when I bench bled it the pin moved up and down unlike in the aftermarket one . Moral of the story I guess by factory parts? Gonna see if that holder is for shipping to keep from loosing the pin. Can send pics if anyone needs to see what I'm talking about.
