Brake Controller Failure?
Thread Starter
Member
Joined: Apr 2007
Posts: 97
Likes: 1
From: Doylestown (Bucks County) PA
2015 ML250, 06 E320 CDI, 2008 GL320 (sold)
Brake Controller Failure?
Driving home yesterday and big red letters...BRAKE FAILURE - VISIT SHOP NOW. Or something to that effect. Braking power was reduced significantly and got the car home. turn it on and off a few times and same message. Next day, message is gone and you can here the pump controller when you turn the key (assume that is the brake controller going into action). drove the car on a few short trip and its back again. turned it off and back on....message is gone.
Any ideas on troubleshooting process? Car has 260K on it. Thanks!
Any ideas on troubleshooting process? Car has 260K on it. Thanks!
Newbie
Joined: Nov 2023
Posts: 8
Likes: 3
E55 AMG
Hi, @ekm I have had the similar issue, can you provide my an update in this.
you can see my thread here :
https://mbworld.org/forums/e-class-w...ing-power.html
Thanks
you can see my thread here :
https://mbworld.org/forums/e-class-w...ing-power.html
Thanks
Member
Joined: Sep 2019
Posts: 119
Likes: 56
From: SD
2000 C230 - 2001 E430 - 2003 E320 -
If you have access to a star (aka - you own one), there is nothing wrong with doing a scan. C2490F is the code for hitting the SBC brake counter limit.
https://mbworld.org/forums/e-class-w...2003-e320.html (this car is still running -still his daily driver and I'm doing all the work on it).
If you clear the code, it will come right back on poweron - the code is set when the SBC reads its internal counter and its > 25k or whatever the actual value was (don't exactly remember). But there is no reason to clear it if you see it - that code is your free ticket to a new SBC unit.
On the user display it will show you what you are seeing BUT it can also be from any other SBC error. It can also be the front battery is bad (there is a battery under the air filter, passenger side of engine compartment) If you are not comfortable doing the diagnose then take it to the dealer. If C2490F is in the unit, it will be a covered repair and replacing the unit will cost nothing.
If they upsell you a brake fluid flush - pay it. Its not covered by the warranty. Most non-MB shops and most DYI's don't do it correctly. Needs positive pressure setup and you follow the star while it cycles the sbc pump as you do each wheel - its a controlled process. Takes about 2L of new fluid.
This is also an excellent time to look at all of the brake lines and hoses and replace those that have cracks in the outer rubber.
https://mbworld.org/forums/e-class-w...2003-e320.html (this car is still running -still his daily driver and I'm doing all the work on it).
If you clear the code, it will come right back on poweron - the code is set when the SBC reads its internal counter and its > 25k or whatever the actual value was (don't exactly remember). But there is no reason to clear it if you see it - that code is your free ticket to a new SBC unit.
On the user display it will show you what you are seeing BUT it can also be from any other SBC error. It can also be the front battery is bad (there is a battery under the air filter, passenger side of engine compartment) If you are not comfortable doing the diagnose then take it to the dealer. If C2490F is in the unit, it will be a covered repair and replacing the unit will cost nothing.
If they upsell you a brake fluid flush - pay it. Its not covered by the warranty. Most non-MB shops and most DYI's don't do it correctly. Needs positive pressure setup and you follow the star while it cycles the sbc pump as you do each wheel - its a controlled process. Takes about 2L of new fluid.
This is also an excellent time to look at all of the brake lines and hoses and replace those that have cracks in the outer rubber.
Last edited by tyabnet; Jan 31, 2024 at 04:37 PM.
MBWorld Fanatic!
Joined: May 2022
Posts: 1,917
Likes: 499
From: The Netherlands
2005 CLS55 AMG W219 C219
@tyabnet This is pretty much a perfect summary
I was notified on Instagram that not all MB dealers worldwide act in the same way. I created a post about SBC failure and luckily it gained traction. You can see some reactions over there:
I was lucky enough that my local dealer also flushed the brake system for free when they replaced my SBC unit.
I was notified on Instagram that not all MB dealers worldwide act in the same way. I created a post about SBC failure and luckily it gained traction. You can see some reactions over there:
I was lucky enough that my local dealer also flushed the brake system for free when they replaced my SBC unit.
Newbie
Joined: Nov 2023
Posts: 8
Likes: 3
E55 AMG
I git the call from the dealer about the service and replacement of the sbc unit is done.
Seems like they have done the brake fluid flush. I posted in the other thread. Please take a look guys
https://mbworld.org/forums/e-class-w...ml#post8918333
Seems like they have done the brake fluid flush. I posted in the other thread. Please take a look guys
https://mbworld.org/forums/e-class-w...ml#post8918333
