E320 Mercedes Brake Failure WTF
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Joined: Jan 2016
Posts: 2,748
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From: In the Shadow of the Tetons
2013 ML350 Bluetec
e-brake at higher speeds is not more efficient than engine braking.
How many W211 owners know that you can select "1" at 80 mph and the computer will not switch to lower gear till the car slows down to allowed speed.
What stumps me is that W211 do have emergency solenoids that will give you mechanical braking, just like in your Corvette. but in panic - in maneuver you never practice it is easy to mistake hard brakes for no brakes.
How many W211 owners know that you can select "1" at 80 mph and the computer will not switch to lower gear till the car slows down to allowed speed.
What stumps me is that W211 do have emergency solenoids that will give you mechanical braking, just like in your Corvette. but in panic - in maneuver you never practice it is easy to mistake hard brakes for no brakes.
A solenoid operated e-brake (either ON or OFF) isn't really an e-brake. It's a parking brake.
Agreed on the electronics of a modern transmission "protecting" the drive train. If the TCM thinks the car will over rev by shifting into the requested gear, it ain't gonna do it.
Last edited by rapidoxidation; Feb 20, 2016 at 03:27 PM.
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Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
I did use ebrake once at over 40 mph and could not tell it did anything. Downshifting sure gave good slow down.
Each experience is different, but using really good ebrake at high speeds might end in locking both rear wheels and that is not going to be pretty.
I made it my life policy to test each vehicle with no power.
Take it to empty parking lot, switch to neutral at 20 mph, (higher on 2nd try) switch engine off and try to maneuver it.
It is very doable, but first impression is scary.
Simulating SBC going to emergency mode is a bit harder to figure out and I am still working on it.
Each experience is different, but using really good ebrake at high speeds might end in locking both rear wheels and that is not going to be pretty.
I made it my life policy to test each vehicle with no power.
Take it to empty parking lot, switch to neutral at 20 mph, (higher on 2nd try) switch engine off and try to maneuver it.
It is very doable, but first impression is scary.
Simulating SBC going to emergency mode is a bit harder to figure out and I am still working on it.
MBWorld Fanatic!
Joined: Jan 2016
Posts: 2,748
Likes: 880
From: In the Shadow of the Tetons
2013 ML350 Bluetec
I wonder if disconnecting the SBC pedal value sensor on the brake pedal hydraulic unit would be enough to trigger the emergency mode...
Back in the day, a manual E-brake lever (worked the rear wheels) on a front wheel drive 5 speedToyota was GANGS of fun on ice covered roads. Yes, yes it was.
I like your "life policy". Makes good sense to know how the car will react to bad situations well before you find yourself unwillingly in a bad situation.
Back in the day, a manual E-brake lever (worked the rear wheels) on a front wheel drive 5 speedToyota was GANGS of fun on ice covered roads. Yes, yes it was.
I like your "life policy". Makes good sense to know how the car will react to bad situations well before you find yourself unwillingly in a bad situation.
Last edited by rapidoxidation; Feb 20, 2016 at 05:31 PM.
Super Member
Joined: Jun 2013
Posts: 804
Likes: 74
From: Staten Island, NY
2010 MB S550, 2017 MB SLC 300
I did use ebrake once at over 40 mph and could not tell it did anything. Downshifting sure gave good slow down.
Each experience is different, but using really good ebrake at high speeds might end in locking both rear wheels and that is not going to be pretty.
I made it my life policy to test each vehicle with no power.
Take it to empty parking lot, switch to neutral at 20 mph, (higher on 2nd try) switch engine off and try to maneuver it.
It is very doable, but first impression is scary.
Simulating SBC going to emergency mode is a bit harder to figure out and I am still working on it.
Each experience is different, but using really good ebrake at high speeds might end in locking both rear wheels and that is not going to be pretty.
I made it my life policy to test each vehicle with no power.
Take it to empty parking lot, switch to neutral at 20 mph, (higher on 2nd try) switch engine off and try to maneuver it.
It is very doable, but first impression is scary.
Simulating SBC going to emergency mode is a bit harder to figure out and I am still working on it.
Super Member
Joined: Jun 2013
Posts: 804
Likes: 74
From: Staten Island, NY
2010 MB S550, 2017 MB SLC 300
I wonder if disconnecting the SBC pedal value sensor on the brake pedal hydraulic unit would be enough to trigger the emergency mode...
Back in the day, a manual E-brake lever (worked the rear wheels) on a front wheel drive 5 speedToyota was GANGS of fun on ice covered roads. Yes, yes it was.
I like your "life policy". Makes good sense to know how the car will react to bad situations well before you find yourself unwillingly in a bad situation.
Back in the day, a manual E-brake lever (worked the rear wheels) on a front wheel drive 5 speedToyota was GANGS of fun on ice covered roads. Yes, yes it was.
I like your "life policy". Makes good sense to know how the car will react to bad situations well before you find yourself unwillingly in a bad situation.
Member
Joined: Feb 2014
Posts: 242
Likes: 18
W211 320CDI -04, W210 270CDI -01
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
On the other hand, the plug was subject to recall as was giving originally big headaches, so I am not touching it till I am sure this is what I need.
Member
Joined: Feb 2014
Posts: 242
Likes: 18
W211 320CDI -04, W210 270CDI -01
If I recall right, emergency solenoids are energized during normal operation (makes sense if total blackout system is emergency mode)... I am sure I have SBC document saved somewhere but watching sport right now 
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MB E320
Was it $985 total including the $675 SBC part?
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Posts: 1
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2006 Mercedes E350 4matic
2006 Mercedes E350 4matic brake failure
I DRIVE A 2006 MERCEDES E350 4MATIC AND JUST EXPERIENCED A CATASTROPHIC BRAKE FAILURE WHILE DRIVING DOWN THE FREEWAY. BRAKES WORKING FINE ALL DAY AND THEN WITH NO WARNING MESSAGES OR NOTICEABLE CHANGES IN CAR THE BRAKES FAILED WHEN I APPLIED THE PEDAL. TRUCKS IN FRONT OF ME, CARS BEHIND, ROAD CONSTRUCTION ON THE RIGHT, CLIFF ON THE LEFT, GOING 65 MPH, THEN NO BRAKES WHEN NEEDED TO AVOID SLOWING TRUCK IN FRONT OF ME. LUCKY ME TO SLIP INTO NEXT LANE, MISS THE TRUCKS AND WENT ANOTHER MILE BEFORE FINDING A PLACE TO PULL OVER. WAS ABLE TO COAST TO SLOW SPEED THEN BY PUMPING BRAKE PEDAL GOT MINIMAL BRAKING UNTIL SLOWED TO A STOP. AFTER THE BRAKES FAILED A "STOP NOW" BRAKE SYSTEM WARNING LIGHT APPEARED IN SPEEDOMETER DISPLAY. YOU MOTHER WAS LUCKY NOT TO GET KILLED.
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Joined: May 2017
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C320
