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Total Brake Failure Mercedes C220 BlueEffiency

My car was taken by Mercedes recovery to the Blackburn Mercedes garage. It stayed there for a week and is now at the Preston Mercedes garage.
 
Apologies to DMS from trapperjohn

Apologies DMS. Hardly a warm welcome to the forum from me.

I hope your Mercedes is sorted out fully very soon and if you could let us know what the fault was I'm sure that will help other members to the future.

Again, sorry.
 
Given that there is a direct connection between the pedal and the wheel brakes I can't come up with a scenario where the braked could fail completely, then recover to normality without intervention on the information given

Were the brakes still operational, but extremely heavy? - that could be loss of servo assistance. Faulty servo or pipework, maybe. Doesn't explain the CC staying on.

I don't see ABS/ASR etc. causing this without other symptoms, and errors being flagged in the ECU. The brakes should fail safe, again very heavy.

Brake fluid boiling, maybe? It could cause the symptoms, but unlikely in a newish car with presumeably decent brake fluid cruising on CC. Brakes on at least 3 wheels would need to be binding very severely, I'd suspect. Why didn't CC turn off?

Has the brake fluid been topped up with anything dodgy, like water, maybe?

Is it a manual? Pressing the clutch in error would reset CC, or the engine would over-rev, noticeably.

I'm assuming the car is standard, and hasn't been crashed/repaired or modified.

I feel for the victim, he doesn't have his car, and he will be met with a wall of doubt.
 
Just run your car in to a Mercedes-benz dealer to get this issue checked over
 

Maybe the cruse control did disengage, but going at 75 mph towards a roundabout you would not notice it had done so, if you had no brakes.

I had the master cylinders both go on my 2007 JCB [ yes JCB].

I was loading a lorry, but managed to put it in reverse before i hit, pumped the brakes and they where fine, three days later the same thing, pedal to the floor and nothing, turned it off and then back on all was fine, it turned out both cylinders where faulty [ intermittently].
 
wheels1 said:

Maybe the cruse control did disengage, but going at 75 mph towards a roundabout you would not notice it had done so, if you had no brakes.

I had the master cylinders both go on my 2007 JCB [ yes JCB].

I was loading a lorry, but managed to put it in reverse before i hit, pumped the brakes and they where fine, three days later the same thing, pedal to the floor and nothing, turned it off and then back on all was fine, it turned out both cylinders where faulty [ intermittently].
Click to expand...

depends on the car , the 4cyl cars do actually decellerate when you knock the cruise off , the 6cyl cars take a lot longer.
 
DMS said:
My car was taken by Mercedes recovery to the Blackburn Mercedes garage. It stayed there for a week and is now at the Preston Mercedes garage.
Click to expand...


DMS/Tayloss, I would be interested if you have an update on your accidents involving the total brake failure which occurred whilst using cruise control.

A friend of mine has been involved in a rather serious accident after picking up his new Mercedes CLC. He has expressed a similar experience to that which you both experienced. Cruise Control at around 65/70, approaching a roundabout he tried to apply the brakes but the pedal just went to the floor. Rather than run into the cars in front he was forced up the bank at the side of the dual carriageway and crashed at high speed into a tree.

I really would be grateful if you could let me know if Mercedes (or other investigations teams for that matter) got to the bottom of the reason for failure to stop in both of your cases?

Thanks in advance for any help.
 
Tayloss and DMS appear to have taken their leave. I doubt you will hear from them again.

Either their posts were indeed just a sham, or they are both now in St Peter's harp chorus behind the Pearly Gates.
 
Why do the Police want to know how the vehicle was being driven before the crash if it's down to brake failure?

Police are appealing for witnesses and information from anyone who saw the collision or the vehicle being driven prior to incident.

Please keep us updated as to their findings relating to the cause. If indeed this is three cases of brake failure it will spark a recall, should be big news.
 
I suppose they will try to establish if it was indeed mechanical failure that caused the crash. At the moment all they have is the driver's statement. They will probably also look at the vehicle itself, but they need to be prepared for the possibility that - depending on the severity of the crash - they may not actually be able to find any proof of the brake failure claimed by the driver.
 
tjw said:
Routine practice one would suspect...
Click to expand...

The problem with this type of thing is that it doesn't ring true. Except for the pedal the CC and the brakes are separate.

The coincidence for both the brakes to fail and the switch on the CC to fail at exactly the same time must be a billion to one.

So as with the other two posters (who never came back to back up their stories)...this doesn't ring true either. Sorry but it's just plain common sense.
 
How do you explain the BMW that crashed on the roundabout a few years back?

Driver said that car accelerated out of control, brakes burnt down, so far OK, but he was also said that the gear lever was stuck in D (i.e. would not shift to N) and the key was stuck in the ignition (i.e. he could not switch off the engine)? Now what are the chances of this? And before you say he simply panicked, he was talking to police on the phone for several minutes trying to slow the car..
 
markjay said:
I suppose they will try to establish if it was indeed mechanical failure that caused the crash. At the moment all they have is the driver's statement. They will probably also look at the vehicle itself, but they need to be prepared for the possibility that - depending on the severity of the crash - they may not actually be able to find any proof of the brake failure claimed by the driver.
Click to expand...

Unfortunately this may prove to be the case, we'll see.

Renault21ts, your assertions as to validity have no real basis, I hope for your sake you do not experience such a situation. (Similarly I could assert that the 2 other posters may have settled with MB in which case you can be assured that a confidentiality clause came into play hence their lack of return to the site...)
 
tjw said:
Unfortunately this may prove to be the case, we'll see.

Renault21ts, your assertions as to validity have no real basis, I hope for your sake you do not experience such a situation. (Similarly I could assert that the 2 other posters may have settled with MB in which case you can be assured that a confidentiality clause came into play hence their lack of return to the site...)
Click to expand...

You miss my point.

The action of hitting the brake pedal would deactivate the CC. The brakes then failed also...I don't buy it.

Why have I no basis for my doubts?
 
tjw, I am not discrediting your friend's explanation, nor the BMW driver's. What I am suggesting is that the probabilities are indeed low and that Police are therefore (rightly) concerned when such a claim is made. Hence their call for witnesses.
 
markjay said:
How do you explain the BMW that crashed on the roundabout a few years back?

Driver said that car accelerated out of control, brakes burnt down, so far OK, but he was also said that the gear lever was stuck in D (i.e. would not shift to N) and the key was stuck in the ignition (i.e. he could not switch off the engine)? Now what are the chances of this? And before you say he simply panicked, he was talking to police on the phone for several minutes trying to slow the car..
Click to expand...

If you are referring to the young driver in a BMW 316 or similar who claimed to have hit speeds of 130mph before crashing into the roundabout, he was subsequently prosecuted for the "incident", IIRC. The prosecution emerged about 6 months after the incident.
 
Bizarre story...
 
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