M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

ML500 brakes help needed please.

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Old Aug 21, 2009 | 10:42 AM
  #1  
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2016 GLE 450 Coupe
ML500 brakes help needed please.

Hi guys,

I am thinking of buying 06 ML500 and found the vehicle I kind of like, but have one concern – the brake pad travels to long until complete stop – it has consistent performance, but it is much longer (pad travel) then on other MLs that I drove. And it starts braking from the beginning, but goes far down towards floor until complete stop. (brake pads condition is ok - about 50% left).
Now, the stupid question – could it be related somehow to the towing package that is factory/dealer installed on it from the beginning? The car has 41K on it.
Any info would be appreciated.

Thank you!
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Old Aug 21, 2009 | 01:57 PM
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2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
Are you saying that the brake pedal travels too far, or the vehicle travels too far before it stops?
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Old Aug 21, 2009 | 02:45 PM
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The brake pedal travels too far. No problem with stopping. But you need to make an adjustment in mind that you have to push it much deeper before it stops.
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Old Aug 21, 2009 | 03:15 PM
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2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
Originally Posted by rostov
The brake pedal travels too far. No problem with stopping. But you need to make an adjustment in mind that you have to push it much deeper before it stops.
My guess is that there is air in the system - probably up near the master cylinder.

I recently rebuilt the calipers on my G500. After what I thought was a very thorough bleeding of the brake system, I had this exact same problem. It required a non-standard reverse brake pressure bleed to get the air cleared out, followed by a conventional pressure bleed. I then had a good pedal; and it's been fine ever since.
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Old Aug 21, 2009 | 03:28 PM
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Correct me if i am wrong, but if there is an air in the system, wouldn't it get back to normal if you pump during single stop?
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Old Aug 21, 2009 | 04:11 PM
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2000 MB G500 NMLE, 2015 Audi Q7 3.0 TDI Prestige
Originally Posted by rostov
Correct me if i am wrong, but if there is an air in the system, wouldn't it get back to normal if you pump during single stop?
No. it will not.
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Old Aug 21, 2009 | 05:19 PM
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'09 ML550
Originally Posted by rostov
Correct me if i am wrong, but if there is an air in the system, wouldn't it get back to normal if you pump during single stop?
If there is air in the system it will stay in the system unless it is somehow removed. This can only be done by bleeding the system. I used to bleed brakes myself but some modern systems are so complex and sensitive that I now find it easier to take it to a mechanic or a brake shop and have them do it.

It is also possible in an '06 that the fluid has acquired water and needs changing. I wouldn't fiddle around -- get it changed and bled professionally and it should be fine. Maybe make that a condition of the sale.
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Old Aug 23, 2009 | 02:30 PM
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Originally Posted by roadrutz
If there is air in the system it will stay in the system unless it is somehow removed. This can only be done by bleeding the system.
Of cause it has to be removed by bleeding the system… I meant that if you pump it a few times during braking, the pedal will get harder and free way will be reduced – only for the current braking. Next time you brake it will be the same bad as before.

Anyway, thanks everybody. I decided not to mess with it and got another one – had to compromise the color, but my wife likes it (that is her car anyway ) It has less miles on and in really good shape.
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