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Old 07-31-2008, 02:03 PM   #1 (permalink)
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Bleeding brakes by pumping pedal

I have always changed braked fluid by having one person in the cab pumping the brake while I bleed the fluid at the caliper. Any reason this method would not work on the w140.

Just curious before I purchase a power bleeder.

Cheers.
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Old 07-31-2008, 08:40 PM   #2 (permalink)
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It is Ok to them this way. I replaced all my fluid in the brake lines this way.

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Old 08-01-2008, 08:37 AM   #3 (permalink)
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Thanks Martin,

That is what I was hoping for.
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Old 08-01-2008, 10:04 AM   #4 (permalink)
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Other than the fact it's a major pain to do for one person that is. I just did mine with a power bleeder and it worked fantastic. It was $43 well spent.

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Old 08-01-2008, 10:05 AM   #5 (permalink)
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Yeah, I agree it is a pain in the ass. But I will put my wife's ass to work on the brake pedal if it saves me $43. Yeah....Im cheap.
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Old 08-03-2008, 12:00 PM   #6 (permalink)
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Did the same with my wife, had her count out loud 3 sec. pump and 6 sec. slow release. At the 4 sec point, I'd shut off the bleeder nipple. USing a clear hose, I saw a major bubble come out of my left rear caliper. This cleared out my sponginess...good luck!
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Old 08-03-2008, 12:34 PM   #7 (permalink)
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Thanks for the info. Seems like that is what I will do. I have no problems with brake feel now and just recently replaced front brakes. Just wanted to bleed them because I dont think the previous owner ever did. Ditto for coolant flush and I am sitting at 118k.
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Old 10-30-2008, 09:55 AM   #8 (permalink)
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Get the power bleeder..much less work/risk
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Old 10-30-2008, 07:23 PM   #9 (permalink)
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The reason you should use the power bleeder and not the brake pedal method is because the latter pushes the brake master cyclinder piston beyond the nominal travel and minor pitting (yes it is there) will cause failure in the seal of the BMS. Spoken from experience...sometimes cheap is expensive
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Old 10-30-2008, 07:59 PM   #10 (permalink)
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easy solution to this is putting something under the break pedal (block of wood, shoe, etc.) so you dont accidentaly press it beyond its normal travel....
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