SBC Brakes onW211

[N4D5]

This thread has started to worry me now. I have a 2005 E280 CDI sport estate with SBC brakes. It's done 64000 miles should I consider selling it. I don't fancy a fat bill for a replacement pump. I love the car and it suits my needs perfectly but this is worrying.

Gotta agree with ya here mate worrying me too. Mine has done 110k.:sad:

 

[star]

This is the unknown thing, the pedal is fly by wire for the best part, and how much movement is there when it switched off,,the system runs at 160 bar,if there is a pressure loss then the dash goes red, so a caliper should not put the red dash on.

Are MB going to tell us of the real fault and if the SAM was involved.


I can turn my SBC off and try, and see how it feels. I can do this on my drive way,, the parking brake will not hold it in reverse on it.

The sbc pump is basically a servo, so if the servo assistance is lost ie sbc pump, the the master cylinder will still operate as normal. you can test this by depessing the brake pedal several times with the ign off and door closed. A caliper would not inself loose make the brake pedal sink to the floor unless its leaking OR is sticking on and making the fluid boil.

 

[television]

The sbc pump is basically a servo, so if the servo assistance is lost ie sbc pump, the the master cylinder will still operate as normal. you can test this by depessing the brake pedal several times with the ign off and door closed. A caliper would not inself loose make the brake pedal sink to the floor unless its leaking OR is sticking on and making the fluid boil.

Thank you for your input and thinking,,I have just been out and tried it, and to all intents and purposes the pedal does go very nearly down to the floor.

So to see if any braking effect at all I will try it on my driveway in the morning.

thank you again and thats easier than plugging in STAR

 

[dieselman]

So to see if any braking effect at all I will try it on my driveway in the morning.

I'd be careful of that, because if there isn't enough force to stop the car then you'll hit the house.
Try it somewhere with a decent run off area.

 

[television]

I'd be careful of that, because if there isn't enough force to stop the car then you'll hit the house.
Try it somewhere with a decent run off area.

Thank you and a very good point,,I will try a straight dip where the road goes up again

 

[jberks]

This thread has started to worry me now. I have a 2005 E280 CDI sport estate with SBC brakes. It's done 64000 miles should I consider selling it. I don't fancy a fat bill for a replacement pump. I love the car and it suits my needs perfectly but this is worrying.

I wouldn't worry - 95,000 now and no concerns yet. They'll replace the pump FOC anyway so no need to worry about a fat bill. If in doubt you can have it checked. My Dads was replaced on a service. No problem with it and no warnings but it had clocked up the required number of activations so a new one was fitted automatically. I am wondering whether I can get the indie to interrogate mine and tell me whether it's due for replacement though. If it is, I can simply book it into the dealer.

 

[television]

Too foggy down her to do a run with no brakes and take photo's this morning

 

[star]

Malc, you will need to deactivate pump to test for pedal height. No fog here.

 

[television]

Malc, you will need to deactivate pump to test for pedal height. No fog here.

Indeed I will , while still thinking about this, in my normal driving position with the seat right back, if the pedal went too far down I would not be able to reach it.

I have worked out the road that I can do it on, as I intend to get to 30mph, turn off the engine, deactivate the pressure and see how far I go,,yes I will have no power steering, if I do not post back you will know that it did not go well

 

[rpe2]

Good Luck, nice knowing you

 

[television]

As a safety feature, the SBC is always active from the pedal,,even when the car is off, this has to be so if you think about it even if you were towing the car or pushing it around, Last night i did not have my shoes on,,so I did not get the correct feel,,7 pumps start mine up with the engine not running

All I can do now is to take STAR with me and de activate the SBC and take it from there on a suitable road

 

[st4]

As a safety feature, the SBC is always active from the pedal,,even when the car is off, this has to be so if you think about it even if you were towing the car or pushing it around, Last night i did not have my shoes on,,so I did not get the correct feel,,7 pumps start mine up with the engine not running

All I can do now is to take STAR with me and de activate the SBC and take it from there on a suitable road

Yes, I have moved mine with the key in the ignition but engine off and used N to get the car to roll and the footbrake to stop the car.

Remember, the "wake up" will trigger on the door being openned. You often hear the pump when you unlock the car.

The bold: Please don't, for your own sake.

 

[turbopete]

Yes, I have moved mine with the key in the ignition but engine off and used N to get the car to roll and the footbrake to stop the car.

Remember, the "wake up" will trigger on the door being openned. You often hear the pump when you unlock the car.

The bold: Please don't, for your own sake.

i think it would be a low speed test on a piece of quiet straight road, to simulate a failure, to allow Malcolm to assess what happens when a failure occurs, so that he can advise accordingly

 

[television]

Yes, I have moved mine with the key in the ignition but engine off and used N to get the car to roll and the footbrake to stop the car.

Remember, the "wake up" will trigger on the door being openned. You often hear the pump when you unlock the car.

The bold: Please don't, for your own sake.

I will start on a slight slope with a run up the other side, I must find out before I do the 150mph runs in the summer

trouble is the rain and getting the car wet

 

[st4]

i think it would be a low speed test on a piece of quiet straight road, to simulate a failure, to allow Malcolm to assess what happens when a failure occurs, so that he can advise accordingly

I suppose so.

You will get about 10% braking power so its not so good. A word of advice to Malc, move your seat closer to the wheel, that pedal will need shoved in further and A LOT harder.

Still, when SBC works its ace. So strong.

 

[st4]

I will start on a slight slope with a run up the other side, I must find out before I do the 150mph runs in the summer

Mine tops out at 140mph

trouble is the rain and getting the car wet

try living here!!!

 

[television]

i think it would be a low speed test on a piece of quiet straight road, to simulate a failure, to allow Malcolm to assess what happens when a failure occurs, so that he can advise accordingly

Yes just a rolling start,,I will know instantly if the car will stop

All on a farm track

 

[turbopete]

I suppose so.

You will get about 10% braking power so its not so good. A word of advice to Malc, move your seat closer to the wheel, that pedal will need shoved in further and A LOT harder.

Still, when SBC works its ace. So strong.

but when it doesnt...............

i just dont like the idea of fly by wire on brakes. at least with solid linkages, you know the linkage will work. with a bit of wire with plugs etc, you can never be 100% sure IMO

 

[turbopete]

Yes just a rolling start,,I will know instantly if the car will stop

All on a farm track

it will stop. eventually!

farm track? you obviously have better farm tracks there than we do here! i avoid taking a car on them, wherever possible!

 

[television]

it will stop. eventually!

farm track? you obviously have better farm tracks there than we do here! i avoid taking a car on them, wherever possible!

They are better than the roads now Pete