How to use HOLD function in new C class?
MBWorld Fanatic!
Joined: Sep 2008
Posts: 1,331
Likes: 9
From: Delaware
2004 Mazda6, 1993 RX7
.
Junior Member
Joined: Jul 2012
Posts: 18
Likes: 1
C250
Brake Hold Function
Ok, so I got my new (to me) C250 (2016) just a week ago and use the brake hold function, works great.
However, this morning I was stopped at lights and the engine autostop kicked in, so the engine stopped. I applied the brake HOLD function and all good. The junction was a bit mad, so I was sat there for a bit, then the engine restarted as the autostop timed out and the brakes released and the car started to move forward. Very disconcerting!!!
So at the next lights i did the same again, but this time pressed the deactivate on the autostop and the engine started up, but the brakes remained on!.
So the question is, what is supposed to happen?
I would have thought that the brakes should not release unless i want them too, not when the autostop times out?
What experience do you guys have of this???
Thanks.
However, this morning I was stopped at lights and the engine autostop kicked in, so the engine stopped. I applied the brake HOLD function and all good. The junction was a bit mad, so I was sat there for a bit, then the engine restarted as the autostop timed out and the brakes released and the car started to move forward. Very disconcerting!!!
So at the next lights i did the same again, but this time pressed the deactivate on the autostop and the engine started up, but the brakes remained on!.
So the question is, what is supposed to happen?
I would have thought that the brakes should not release unless i want them too, not when the autostop times out?
What experience do you guys have of this???
Thanks.
Member
Joined: Nov 2024
Posts: 97
Likes: 31
From: California
E53 (2025), C300 4MATIC (2014)
Hoping this is the right place for this discussion:
Brake HOLD feature, which I have used for 11 years in my 2014 C300, is suddenly intermittent for the last 2-3 weeks.
Some days it works for a while, or only after a few miles, and others it doesn't work at all. Others it works right away, all day. The last month I have noticed it fails in a similar scenario that may have worked the day before. Brake pedal doesn't feel more or less stiff than anytime in the last decade. Wondering if this sounds like regular wear after a decade or so, or first time you've heard of this failing inconsistently? Maybe time to buy a data port reader to see if there is something off, or just bring it to the dealership and set my money on fire?
Brake HOLD feature, which I have used for 11 years in my 2014 C300, is suddenly intermittent for the last 2-3 weeks.
Some days it works for a while, or only after a few miles, and others it doesn't work at all. Others it works right away, all day. The last month I have noticed it fails in a similar scenario that may have worked the day before. Brake pedal doesn't feel more or less stiff than anytime in the last decade. Wondering if this sounds like regular wear after a decade or so, or first time you've heard of this failing inconsistently? Maybe time to buy a data port reader to see if there is something off, or just bring it to the dealership and set my money on fire?
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
Hoping this is the right place for this discussion:
Brake HOLD feature, which I have used for 11 years in my 2014 C300, is suddenly intermittent for the last 2-3 weeks.
Some days it works for a while, or only after a few miles, and others it doesn't work at all. Others it works right away, all day. The last month I have noticed it fails in a similar scenario that may have worked the day before. Brake pedal doesn't feel more or less stiff than anytime in the last decade. Wondering if this sounds like regular wear after a decade or so, or first time you've heard of this failing inconsistently? Maybe time to buy a data port reader to see if there is something off, or just bring it to the dealership and set my money on fire?
Brake HOLD feature, which I have used for 11 years in my 2014 C300, is suddenly intermittent for the last 2-3 weeks.
Some days it works for a while, or only after a few miles, and others it doesn't work at all. Others it works right away, all day. The last month I have noticed it fails in a similar scenario that may have worked the day before. Brake pedal doesn't feel more or less stiff than anytime in the last decade. Wondering if this sounds like regular wear after a decade or so, or first time you've heard of this failing inconsistently? Maybe time to buy a data port reader to see if there is something off, or just bring it to the dealership and set my money on fire?
Member
Joined: Nov 2024
Posts: 97
Likes: 31
From: California
E53 (2025), C300 4MATIC (2014)
Got an OBD2 reader. No error codes. Brake HOLD worked today for 10 minutes while testing just to further puzzle me.
Forgot to check 12V battery directly, but OBD2 reader said the "Control Module Voltage" was 7-8V while engine was off, then shot up to 13-14V while the engine was idling and I drove a little. Not sure that tells me anything about the 12V battery. If I drive about 4 miles for my commute (same for 11 years) is that enough to keep the 12V battery topped up? About 80% surface streets. Less than 2 mins on the highway.
How do I check AUX battery (new to me)?
Forgot to check 12V battery directly, but OBD2 reader said the "Control Module Voltage" was 7-8V while engine was off, then shot up to 13-14V while the engine was idling and I drove a little. Not sure that tells me anything about the 12V battery. If I drive about 4 miles for my commute (same for 11 years) is that enough to keep the 12V battery topped up? About 80% surface streets. Less than 2 mins on the highway.
How do I check AUX battery (new to me)?
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
Got an OBD2 reader. No error codes. Brake HOLD worked today for 10 minutes while testing just to further puzzle me.
Forgot to check 12V battery directly, but OBD2 reader said the "Control Module Voltage" was 7-8V while engine was off, then shot up to 13-14V while the engine was idling and I drove a little. Not sure that tells me anything about the 12V battery. If I drive about 4 miles for my commute (same for 11 years) is that enough to keep the 12V battery topped up? About 80% surface streets. Less than 2 mins on the highway.
How do I check AUX battery (new to me)?
Forgot to check 12V battery directly, but OBD2 reader said the "Control Module Voltage" was 7-8V while engine was off, then shot up to 13-14V while the engine was idling and I drove a little. Not sure that tells me anything about the 12V battery. If I drive about 4 miles for my commute (same for 11 years) is that enough to keep the 12V battery topped up? About 80% surface streets. Less than 2 mins on the highway.
How do I check AUX battery (new to me)?
Member
Joined: Nov 2024
Posts: 97
Likes: 31
From: California
E53 (2025), C300 4MATIC (2014)
I did a comprehensive scan and 4 blue notices (not warnings) came up that were particular to my car. It knew all the specs for my car while I looked at the detail on the notices. Once I started the engine and did another scan the two notices (seat adjustment and ESP) disappeared. The second one was "ESP(R) - Electronic stability program (N30/4): The power supply is outside the valid range"
I bought the OBD2 reader last night: BlueDriver
I bought the OBD2 reader last night: BlueDriver
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
I did a comprehensive scan and 4 blue notices (not warnings) came up that were particular to my car. It knew all the specs for my car while I looked at the detail on the notices. Once I started the engine and did another scan the two notices (seat adjustment and ESP) disappeared. The second one was "ESP(R) - Electronic stability program (N30/4): The power supply is outside the valid range"
I bought the OBD2 reader last night: BlueDriver
https://www.amazon.com/dp/B00652G4TS
I bought the OBD2 reader last night: BlueDriver
https://www.amazon.com/dp/B00652G4TS
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MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
Got an OBD2 reader. No error codes. Brake HOLD worked today for 10 minutes while testing just to further puzzle me.
Forgot to check 12V battery directly, but OBD2 reader said the "Control Module Voltage" was 7-8V while engine was off, then shot up to 13-14V while the engine was idling and I drove a little. Not sure that tells me anything about the 12V battery. If I drive about 4 miles for my commute (same for 11 years) is that enough to keep the 12V battery topped up? About 80% surface streets. Less than 2 mins on the highway.
How do I check AUX battery (new to me)?
Forgot to check 12V battery directly, but OBD2 reader said the "Control Module Voltage" was 7-8V while engine was off, then shot up to 13-14V while the engine was idling and I drove a little. Not sure that tells me anything about the 12V battery. If I drive about 4 miles for my commute (same for 11 years) is that enough to keep the 12V battery topped up? About 80% surface streets. Less than 2 mins on the highway.
How do I check AUX battery (new to me)?
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
Sorry about that, I forgot to answer your aux battery question, see this thread: https://mbworld.org/forums/c-class-w...y-battery.html
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
I did a comprehensive scan and 4 blue notices (not warnings) came up that were particular to my car. It knew all the specs for my car while I looked at the detail on the notices. Once I started the engine and did another scan the two notices (seat adjustment and ESP) disappeared. The second one was "ESP(R) - Electronic stability program (N30/4): The power supply is outside the valid range"
I bought the OBD2 reader last night: BlueDriver
https://www.amazon.com/dp/B00652G4TS
I bought the OBD2 reader last night: BlueDriver
https://www.amazon.com/dp/B00652G4TS
Member
Joined: Nov 2024
Posts: 97
Likes: 31
From: California
E53 (2025), C300 4MATIC (2014)
This reader was chosen after only a paltry amount of research (less than most here would likely do). The main reason was that it had reasonable reviews online, would use the smartphone for the screen and not require subscriptions for future use. Finally, and embarrassingly, Amazon said I could have it in 9 hours if I ordered now... and I muttered to myself "what a time to be alive" and clicked purchase. I am happy that less than 12 hours after wondering if there was an obvious fault, I now know I need to dig deeper, pay more attention to the symptoms, and then chill out in 2 weeks when my 2025 E53 is delivered.
MBWorld God!
Joined: Dec 2019
Posts: 32,681
Likes: 6,420
This reader was chosen after only a paltry amount of research (less than most here would likely do). The main reason was that it had reasonable reviews online, would use the smartphone for the screen and not require subscriptions for future use. Finally, and embarrassingly, Amazon said I could have it in 9 hours if I ordered now... and I muttered to myself "what a time to be alive" and clicked purchase. I am happy that less than 12 hours after wondering if there was an obvious fault, I now know I need to dig deeper, pay more attention to the symptoms, and then chill out in 2 weeks when my 2025 E53 is delivered.
Ah I see, enjoy the new vehicle! Congrats : ) W214 will be too new for the Launch CReader anyways.
