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#1
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Cannot bleed the brake on my 87 300sdl
The brake on my 300SDL project car always feel mushy. Tried to bleed the right rear brake and now nothing works. I loosen the bleeding nipple and connected a hose it, asked a friend to pump the brake while I watched the brake fluid coming out into a bag. Some fluid and air came out then NOTHING afterward. The fluid reservoir does not go down and the brake now goes all the way to the floor. Removed the caliper with the brake line dangling, pumped the brake, still nothing come out and reservoir does not go down.
Tried to do it with engine running and still nothing. I have bled brakes before but not with a car with ABS. Did I do something wrong? Why there is no fluid coming out even with the caliper removed, I would expect at least some would come out due to gravity. Any help is appreciated.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#2
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Cars with ABS tend to need more pressure to force fluid through if you're using a power bleeder, so I would take that to mean that gravity alone isn't enough (although I have never tried).
You are closing the bleed nipple when the pedal is on the upstroke, right? |
#3
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I am not using a power/pressure bleeder. I loosen the nipple, asked my friend to pump and hold, then I tighten the nipple then repeat the cycle. It works for a while with some fluid and air coming out then NOTHING. No matter what we did with the pedal, there is nothing coming out. I remove the caliper and still nothing coming out when pumping the pedal.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#4
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the resovoir has two chambers, one for the front and rear. the rear is probably empty. its hard to tell so look from both sides.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual |
#5
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How to look? How to fill the rear chamber?
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#6
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just look at all sides of the resovoir. I think you have to look at the side facing the engine. if you put your hood up all the way this is easier. to fill you just let the fluid flow over the chamber wall. i jiggled the resovoir a little bit.
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1984 300SD Orient Red/ Palomino 1989 560SEC 2016 Mazda 6 6 speed manual 1995 Ford F-150 reg cab 4.9 5speed manual |
#7
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I was told by someone that bleeding the brakes with the car running gives more pressure and makes it easier. Is this true?
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1985 500SL Euro w/ AMG bits 130k 1984 300SD Turbodiesel 192k 1980 240D Stick China 188k 2001 CLK55 AMG 101k 2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!! |
#8
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Quote:
Well with the car running the vacuum assist will be working so you won't have to press on the pedal as hard, but I don't think it would make it any easier.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine |
#9
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Quote:
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine |
#10
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Thanks for all your help. I fill the reservoir to the brim, put the caliper back in and it is kind of working now, at least it is back to what it was. I can bleed the RR brake and fluid come out. Will work on it later this week.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#11
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are the brakes just mushy, or does the pedal keep going all the way to the floor slowly after the car is stopped, running, and in gear?? If the pedal keeps going, I"d suggest you get a master cylinder or the rebuild kit. Brakes aren't something to cheap out on......
If they're just mushy, but the pedal doesn't keep going, you probably need to re-bleed the whole system and keep the resivour full this time.....
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All it takes for evil to prevail is for good men to stand by and do nothing. Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor '95 S320 LWB '87 300SDL '04 E500 wagon 4matic |
#12
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mushy brakes
You will need to pressure bleed them ....
http://faculty.ccp.edu/faculty/dreed/Campingart/jettatech/bleeder/index.htm http://www.brakebleeders.com/ http://www.bmw-m.net/TechProc/bleeder.htm
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2003 SLK 230 (85000) 1999 E300 Turbo Diesel (388,000) 1991 350SD Turbo Diesel (185,000) |
#13
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Quote:
On the other hand, avoid vacuum bleeders, they never get a solid seal around the bleeder nipple, and if you have a manual one (like a mityvac) you'll be pumping like crazy.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
#14
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" the two-person old way works just as well."
You will be there a Loooong Time!! "could damage the internal seals" The number one reason to use a pressure bleeder!! OK lets do the math Master cyl $231.66 Home made brake bleeder $30.00 A savings of $200.00 Thats a good reason $$
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2003 SLK 230 (85000) 1999 E300 Turbo Diesel (388,000) 1991 350SD Turbo Diesel (185,000) Last edited by Anthony Cerami; 06-29-2009 at 08:41 AM. |
#15
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You won't damage the MC doing this procedure unless you're careless with the bleeding. Get a good helper and you're all set--just a personal preference.
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TC Current stable: - 2004 Mazda RALLYWANKEL - 2007 Saturn sky redline - 2004 Explorer...under surgery. Past: 135i, GTI, 300E, 300SD, 300SD, Stealth |
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