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M-Class (W163) 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

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Old 09-01-2006, 11:22 AM   #1
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Location: Houston, TX
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Brake Bleeding Sequence

At 39000 miles, I have already replaced 4 brake pads. But the pedal seems too low. Sitting at a stop light, there isn't that much more to push on the pedal to what feels like bottom.

I have had my 2000 since new so I know it is notorious for the spongy brake. But it just doesn't seem as good as it should be.

I got a Motive power bleeder and flushed the system and bleeded the lines. Did not see much difference.

Is there a special brake bleeding sequence or procedure for the ML?

I did the standard, farthest away from the master cylinder sequence.

BTW to Motive brake bleeder is awesome. No fuss, no muss.
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Old 09-01-2006, 03:43 PM   #2
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Quote:
Originally Posted by cyeung65
At 39000 miles, I have already replaced 4 brake pads. But the pedal seems too low. Sitting at a stop light, there isn't that much more to push on the pedal to what feels like bottom.

I have had my 2000 since new so I know it is notorious for the spongy brake. But it just doesn't seem as good as it should be.

I got a Motive power bleeder and flushed the system and bleeded the lines. Did not see much difference.

Is there a special brake bleeding sequence or procedure for the ML?

I did the standard, farthest away from the master cylinder sequence.

BTW to Motive brake bleeder is awesome. No fuss, no muss.
It may not be a question of bleeding, I've found that if, whilst parked, I press hard on the brake pedal until it is depressed as far as it will go (usually near the floor) then the brakes seem to return to 'normal' for a few thousand miles.

Worn pads can also worsen the pedal feel.

I realise that this is not a direct answer to your question, I hope someone else answers it authoritatively.
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ML 270CDi (Obsidian Black), 57K miles, currently on 255/60H17 Continental CrossContactLX's.

Mods: OEM sunroof deflector; LED 3rd brake light (self made); plastic pivot on accelerator pedal replaced with 10mm steel bolt; loading sill protector; soundproofed all 5 doors, engine bulkhead and head liner.

Wife owns a 2002 A160 (44K miles) with 3 faulty steering columns in the first 4 years! It also has many other problems and costs more than the ML to run !!!
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Old 09-01-2006, 04:44 PM   #3
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Quote:
Originally Posted by marcelc
It may not be a question of bleeding, I've found that if, whilst parked, I press hard on the brake pedal until it is depressed as far as it will go (usually near the floor) then the brakes seem to return to 'normal' for a few thousand miles.

Worn pads can also worsen the pedal feel.

I realise that this is not a direct answer to your question, I hope someone else answers it authoritatively.
Appreciate any feedback on this issue. Thank you, that is quite interesting. I wonder what mechanical/hydraulic aspect causes that?
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Old 09-01-2006, 11:16 PM   #4
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Usually but not always, if you have air in the system, the pedal will go very low on the first pump but than rise if you continue to pump.

I had a problem years ago where the pedal behaved as if there was air in the system. To isolate the problem I pinched off the front brake lines (put a clamp on the rubber parts of the break lines just before each front caliper), and the pedal stopped going to floor and became very hard. To make a long story short, it turned out that my rotors were so warped that the break pads were actually bending to conform to the surface.
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Old 09-01-2006, 11:16 PM
 
 
 
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2006, 350, bleed, bleeding, brake, brakes, fluid, ls400, mercedes, ml, ml350, ml430, problems, sequence, spongy



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