Mbenz W169 rear brake pads never active

Xhemal

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Hello

I can see in my car W169 - 2005 - rear brake pads almost never work, I asked some mechanics , and they told me that it was an mercedes engineering mistake, LOL , so car only works with front brake pads, anyone using this car had the same problem and any possible fix ?!
 

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Hello

I can see in my car W169 - 2005 - rear brake pads almost never work, I asked some mechanics , and they told me that it was an mercedes engineering mistake, LOL , so car only works with front brake pads, anyone using this car had the same problem and any possible fix ?!
So the car has just failed the MOT ?
 
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Xhemal

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So the car has just failed the MOT ?

Well after 4-5 times of trying somehow they started working, and passet it, but i dont see them working on the road.
 

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Well after 4-5 times of trying somehow they started working, and passet it, but i dont see them working on the road.
You probably don’t brake hard enough normally to activate the rear brakes ? Maybe they could do with a caliper refurb if they are sticking (brake caliper pistons)
 
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Xhemal

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You probably don’t brake hard enough normally to activate the rear brakes ? Maybe they could do with a caliper refurb if they are sticking (brake caliper pistons)
well i think its more like a Mbenz problem, meaby changing the brake caliber could make them work, as i told you during MOT test it probably failed about 5 times
 

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How is it a Mercedes problem?
 
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Xhemal

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How is it a Mercedes problem?
Well if knew it i wouldn’t be asking here , I know it does not make sense but , i need someone who owned/ owns this car to asnwer me
 

alexanderfoti

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Rear brakes work all the time.

If your rear brakes do not work, its because the calipers are seized or seizing, and need rebuilding or replacing.

not because they are designed not to work by Mercedes.
 
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Xhemal

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Rear brakes work all the time.

If your rear brakes do not work, its because the calipers are seized or seizing, and need rebuilding or replacing.

not because they are designed not to work by Mercedes.

Well i know thats the logic of brakes, but it would be good to get an answer from someone who knows this kind of car , probably you are right, but mechanic could simply fix the calipers or tell me to buy new and get the money and not tell me that is an Mbenz problem and MOT test guy didnt have why to try 4-5 times for the rear brakes to work
 

alexanderfoti

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Well i know thats the logic of brakes, but it would be good to get an answer from someone who knows this kind of car , probably you are right, but mechanic could simply fix the calipers or tell me to buy new and get the money and not tell me that is an Mbenz problem and MOT test guy didnt have why to try 4-5 times for the rear brakes to work

We (I) know this car. Fix multiple versions on a weekly basis.

You have asked for the info and we have provided it? I fail to see what you are looking for?
 
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Xhemal

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We (I) know this car. Fix multiple versions on a weekly basis.

Oh you could tell me this at beginning :), so they should get actived evrytime/ and not when i only press hard on brakes ? and so I do need a caliber work in order to fix them ?
 

alexanderfoti

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Oh you could tell me this at beginning :), so they should get actived evrytime/ and not when i only press hard on brakes ? and so I do need a caliber work in order to fix them ?

They will always work on a percentage of braking, about 35% or so.

With the wheels off the ground they should stop them spinning with moderate pressure.
 
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Xhemal

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They will always work on a percentage of braking, about 35% or so.

With the wheels off the ground they should stop them spinning with moderate pressure.
Well mine do not seem to work , as I told it was very problematic to pass the MOT test , and when I wash my car i put water to front brakes ( i see black water getting out of it - probably because of brake work ) but for rear brakes never something like that
 

alexanderfoti

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Well mine do not seem to work , as I told it was very problematic to pass the MOT test , and when I wash my car i put water to front brakes ( i see black water getting out of it - probably because of brake work ) but for rear brakes never something like that

The water is probably not helping as this will accelerate corrosion on the pistons.

If it struggled to pass the brake test on the MOT then they need looking at, most likely both rear calipers need replacing. or rebuilding.
 

EmilysDad

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Oh you could tell me this at beginning :), so they should get actived evrytime/ and not when i only press hard on brakes ?

Of course they get 'actived' every time you press the brake pedal, but all cars will brake harder at the front because the weight on the front increases as you brake .. that's why cars have bigger brakes at the front.

and so I do need a caliber work in order to fix them ?
Impossible to tell from a forum. ;)
 
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Xhemal

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The water is probably not helping as this will accelerate corrosion on the pistons.

If it struggled to pass the brake test on the MOT then they need looking at, most likely both rear calipers need replacing. or rebuilding.
Yeah i know about water , i did that only to check if rear brakes worked
 

V6Matty

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I have the same can and year as you and can categorically state they do work on the rear
 

malcolm E53 AMG

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Yes rear brakes are usually rated at 35% of the braking force that is why the callipers and discs are much smaller than the fronts. I would get the rear callipers refurbed or replaced as the piston seals are obviously sticking which makes the car unsafe in some conditions
 
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Xhemal

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I have the same can and year as you and can categorically state they do work on the rear
they work without problem, evry time right ?
 

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