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Bleeding ABS Brake Systems

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Old Jul 13, 2003 | 01:27 AM
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Bleeding ABS Brake Systems

Just was thinking of the ABS brake system on modern Mercedes.

I assume one would need the SDS Laptop to actuate the ABS valves in order to properly bleed the ABS system on current Mercedes vehicles ?


Would I be correct in assuming this ?
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Old Jul 13, 2003 | 01:39 AM
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Why would you need to activate the valves? In overly simple terms, doesn't ABS "bleed" pressure and therefore fluid back into the master cylinder? It would appear that though the valves are in line, they are normally open in the direction of the wheel cylinder.

The calves were not a factor in bleeding the brakes on my ABS equipped Denali. Is MB ABS that much different?
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Old Jul 13, 2003 | 01:59 AM
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This is exactly what I am trying to figure out.....
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Old Jul 13, 2003 | 07:51 AM
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You need to use a pressure bleeder to flush fluid of ASR as well as brake lines. Cars without ASR can be bled conventionally ( no pressure bleeder required).
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Old Jul 13, 2003 | 12:48 PM
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Originally posted by Lou Nielsen
You need to use a pressure bleeder to flush fluid of ASR as well as brake lines. Cars without ASR can be bled conventionally ( no pressure bleeder required).
Of course, a power bleeder makes flushing easier (no need to pump the brake pedal) but is it absolutely mandatory with MB ABS and why?
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Old Jul 13, 2003 | 02:01 PM
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you are correct, to PROPERLY bleed/replace the fluid you would need to pulse the valves.
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Old Jul 13, 2003 | 02:06 PM
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Originally posted by nov0798
you are correct, to PROPERLY bleed/replace the fluid you would need to pulse the valves.
So how is this done? I am getting ready to replace the front pads and rotors on my E55. Will I be able to do this myself? If not, can I asume that only the dealer or someone with special MB tools can do this?
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Old Jul 14, 2003 | 12:24 AM
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well if you are just replacing the pads/rotors you will not need to bleed them. if you are going to bleed/replace the fluid then i would recommend letting the dealer do it, especially because brakes are so important. now im not one to take the car to the dealer for anything but for a proper flush/replace/bleed i would let them do it.
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Old Jul 14, 2003 | 12:31 AM
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Thanks.
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Old Jul 16, 2003 | 12:19 PM
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The dealership would put alternative fluid in our brake systems?
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Old Jul 16, 2003 | 08:53 PM
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Originally posted by nukblazi
The dealership would put alternative fluid in our brake systems?
I'm not sure what you mean by alterative but the dealer just replace the fluid in my 2000 CLK 430 at no cost! I never replaced brake fluid in my cars before. Of course, I don't keep them for more than a few years and less than 40,000 miles. Does anyone else find this excessive for a 3 year old car with less than 20,000 miles on it?
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Old Jul 17, 2003 | 01:27 AM
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Pulse the valves?

"to PROPERLY bleed/replace the fluid you would need to pulse the valves."

I've never heard of this before (not that I'm omniscient). Does a power bleeder do this? I doubt it, but once again I don't know. As far as replacing brake fluid....MB recommends it every two years for my car ('01 C320) and they replaced it for free during my last 'B' service (48K miles). I think replacing brake fluid should be based on the amount of water in the brake fluid which can be read with a cheap tool/sensor and not based on time. Does anyone know anything about the accuracy of brake fluid hydroscopic testors?
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Old Jul 17, 2003 | 08:20 AM
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See the following thread regarding this question: https://mbworld.org/forums/showthrea...&threadid=2591 By the way, the answer to many questions can be found using the search feature.
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Old Jul 23, 2003 | 05:53 PM
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As long as the car in question doesn't have SBC, you would bleed the brakes the same way you would on a '74 Buick (pump, pump, pump, hold).
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