Mbenz W169 rear brake pads never active

Flyinspanner

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Xhemal, Yes car rear brakes work every time you press the pedal.

You don’t appear to be very mechanically minded, and so you are best to take the car to your nearest independent mercedes specialist, who can properly diagnose and fix your problem, the “mechanic” who said it is a Mercedes problem, sounds foolish, and I wouldn’t trust him to deal with it.

Post up the general area you live and you may get a recommendation of a good local independent.
 

Bogus

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Take it to garage (if you can find one open ) or even get a mobile mechanic out, (socially distanced ). They are brakes, (not flux capacitors ) and you dont need an MB expert, but its clear they need attention, either a caliper clean and lub or maybe a bit of bleeding. They should work every time you press on that pedal
 
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Xhemal

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Very clear from evryone, Thank you all, for helpfull answers :)
 

ZZZZ

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I've owned my A200 C169 for five years now, never had a problem with rear (or front, for that matter) brakes.

Just recently replaced front brake pads myself (sensor message came up on IC), next time it will be both front and rear, same as it was the last time.

Had a rear parking brake cables and shoes, etc replaced a few weeks ago by a competent mechanic - now works like new.

I think, as with any car - if you look after it, it'll be fine :)
 

mioba

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To the OP. For the sake and your safety and those of others in the vicinity of your vehicle. Please do get your van looked at regarding the break issue by a professional.
 

Boki

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Yeah i know about water , i did that only to check if rear brakes worked
Hey, did you check the main brake cylinder, did you check the rear brake corector, and in the end did you try to vent the rear brake calipers. If they don't get any oil by presing pedal because of air in the system they simply don't work, simple as that. Also, further, the brake calipers have sliders along which the inner part travels, if they are not correct, they will also not work. This is so simple, I don't belive what I'm reading here, no offense to anybody.
 

Boki

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Hey, did you check the main brake cylinder, did you check the rear brake corector, and in the end did you try to vent the rear brake calipers. If they don't get any oil by presing pedal because of air in the system they simply don't work, simple as that. Also, further, the brake calipers have sliders along which the inner part travels, if they are not correct, they will also not work. This is so simple, I don't belive what I'm reading here, no offense to anybody.
It has nothing to do wit the tipe of your car, brake work the same on all cars.
 

brandwooddixon

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I guess that the rear callipers are probably seized due to lack of use.

I've found in the past that if you have a tendency to brake gently then the rear brakes never really get much use and depending on the design the callipers will seize with rust especially if they are the one piston sliding calliper type.

Its a simple thing to fix, just time consuming and it can be done without replacing the whole calliper.

If I've not done much mileage, like at the moment, I tend to find an empty stretch of road where its safe to brake hard, without causing an accident, releasing them before I come to a stop. Repeat a couple of times and that's it.

Have you ever noticed how your brakes feel sharper after an MOT? All due to the brake test.
 

gh3382

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I have a 2010 vehicle and had to replace the pads due to wear so they must work.
No emergency heavy stopping just normal driving. Whatever the problem is I dont see it being a Mercedes fault and if it was it would have been subject to a recall many years ago.
 
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Xhemal

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I've owned my A200 C169 for five years now, never had a problem with rear (or front, for that matter) brakes.

Just recently replaced front brake pads myself (sensor message came up on IC), next time it will be both front and rear, same as it was the last time.

Had a rear parking brake cables and shoes, etc replaced a few weeks ago by a competent mechanic - now works like new.

I think, as with any car - if you look after it, it'll be fine :)

Well the problem was that rear brakes get active at pressure of 890 N when the pedal is pressed , the MOT wont pass my car unles the rear brakes get active under 500 N which is the limit, this problem is not only on my car !
 
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Xhemal

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Have you ever noticed how your brakes feel sharper after an MOT? All due to the brake test.
Yes thats correct, my rear brakes got active at 890 N , limit was 500 N
 

V6Matty

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Well the problem was that rear brakes get active at pressure of 890 N when the pedal is pressed , the MOT wont pass my car unles the rear brakes get active under 500 N which is the limit, this problem is not only on my car !
You have a problem with your rear brakes, either not enough pressure going to them or someone has changes the brake assist to a different part (looks the same but incorrect for the car) and it’s not doing what it should.
As above my wife’s 169 rears are active well below what your suggesting
 

mioba

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OP did you get this fixed or still driving around without brakes.

500N....you must have a very heavy left foot
 

mattkh

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........ as my recent MOT had the rears stopping at around 300/330
Does the MOT Tester put these figures down on the printout the garage gives you after a MOT. ?
 

V6Matty

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Does the MOT Tester put these figures down on the printout the garage gives you after a MOT. ?
Yeah written somewhere on the bill he usually gives me, I’ll dig through the paperwork in a bit

edit,
Found them and actually much lower than I thought, afraid I haven’t a clue which way around they are but this is front then rear then handbrake,
330
320
150
130
150
 
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joderest

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wow, what a thread !!!!
I think the OP needs a little knowledge imparted to him...…...
When the brake pedal is pushed down, all systems will favour a little bit more pressure to the front brakes, hence why the nose of the car dips, however it will also ALWAYS send pressure to rear brakes so the braking is balanced.
What happens is that rear brakes tend to move less than the fronts, and start to get, for want of a better word, sticky, hence over time it requires more and more pressure to get the pistons to move, until, at some point they become seized.
When that time is reached, as has already been explained, a rebuild or replacement of the callipers is required to bring back the balance to the braking effort.
Like others, i am somewhat surprised it has been granted an MOT pass.
 

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