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#1
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85 W123 Brake Bleed Coming Up
I need to bleed my brakes and want to follow Army's recommendation about bleeding with the engine running. Do I have the second person pump on the brake pedal, hold hard, then I open the bleeder and watch for all bubbles to stop? Do this on all 4, watching closely the fluid level in the reservoir. I plan to put a block of wood under the brake pedal and bleed in the proper sequence. Rear brakes were recently completed, new calipers and rotors. Fronts are OK and bleeders are not seized. My problem is a low pedal and excessive effort to stop the car compared to how it was before.
I used a Motive Bleeder before and bled the brakes by myself and am thinking the pump-the-pedal method may be required for this car. Last warm day in the US NE is Sunday :-(
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1985 300D 197K - Semi-Daily Driver Diesel 1998 Volvo V70 AWD 226K - Daily Driver 2 1998 Volvo S70 140K - Wife's DD 2003 GMC Sonoma ZR2 Option - Rusty Truck THE BABY 1958 220S Sedan 66K All original, never restored and never will be. |
#2
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I use this on my W124:
It's a brake reservoir lid like it's usually used on these older benzes, with a hole in the middle, and a tire valve from a bike stuck trough there. Then the rubber seal that is normally in the lid is put ontop of the tire tube thats now in the seals place, and the whole assembly is screwed onto the reservoir. Works like a charm, just don't go above 1 bar (especially if you use a compressor, the lid might blow off*) and assure that the reservoir doesn't run dry, but you probably know that *Don't ask how I know |
#3
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The Motive bleeder works like this. The screw on cap provided with the thing fits right on the reservoir and one pumps up the motive thing to about 15 lbs. It really seemed to work OK but the brake is still too low and mushy and pumps up some with repeated pumping of the pedal, classic air in the lines action. I think my MC is OK but at 193000 maybe it's sort of beat too.
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1985 300D 197K - Semi-Daily Driver Diesel 1998 Volvo V70 AWD 226K - Daily Driver 2 1998 Volvo S70 140K - Wife's DD 2003 GMC Sonoma ZR2 Option - Rusty Truck THE BABY 1958 220S Sedan 66K All original, never restored and never will be. |
#4
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I have a Motive Brake Bleeder, and have used it on several 123`s, as well as my own 85 300D. works very well.
What do you believe is different with the 85 model year? Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#5
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The Motive bleeder rocks.
Hook it up, fill it up, pump it up, and go to each wheel and crack the bleeder until you see new fluid. No need for a helper pumping the brakes, no worrying about the reservoir going dry, total piece of cake. I will never bleed the old school way again.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#6
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I bet when I replaced the back brakes and used the Motive bleeder I got air in the lines from not being careful about the fluid. I didn't put fluid in the Motive canister, just used it to build up pressure for the bleed. Going to buy 2 qts of fluid and fill the Motive thng and try again, all 4 brakes. I know the thing works, I just must have screwed up.
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1985 300D 197K - Semi-Daily Driver Diesel 1998 Volvo V70 AWD 226K - Daily Driver 2 1998 Volvo S70 140K - Wife's DD 2003 GMC Sonoma ZR2 Option - Rusty Truck THE BABY 1958 220S Sedan 66K All original, never restored and never will be. |
#7
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Be sure to release the pressure in the motive, before you unscrew the master cylinder cap when you get through.
when the pressure us released, it will suck back the fluid in the line back to the container. and your MC will be at the correct level. NOTE: make sure that the tubing on the motive is good. I was under the R/R bleeding the caliper, and suddenly heard water dripping, instead it was brake fluid dripping down under the engine. rushed up to the engine and there was brake fluid spraying all over the fenders, hood eng etc... the vinal tube cracked at a fitting, I have had this for quite a while. replaced all the tubing and back up and running. I sure was running to get the mess cleaned up before it did any damage to the paint. Just another day in "DIY". Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#8
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And done! Pedal is a bit higher and more firm. I'm thinking to replace/rebuild the MC on the next go-round as the car's nearing 200K. Front brakes look pretty good as far as pad wear but the wires leading into the chassis for the pad wear indicators are very much shot. Maybe in the spring. Anyway, the Motive Bleeder when used as intended works pretty much perfectly. I plan to fiddle with it to build adaptors for my other cars using JY reservoir caps and tirevalve parts.
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1985 300D 197K - Semi-Daily Driver Diesel 1998 Volvo V70 AWD 226K - Daily Driver 2 1998 Volvo S70 140K - Wife's DD 2003 GMC Sonoma ZR2 Option - Rusty Truck THE BABY 1958 220S Sedan 66K All original, never restored and never will be. |
#9
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Quote:
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#10
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Quote:
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
#11
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X2, yeah mine are good.
I think those are a replaceable item, the bird might have them. I think Fastlane (Phill) had them when it was up and running. I just don`t need another one of those surprises. It`s funny now, but sure not when it was happening. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#12
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Black-capped Reservoir
Quote:
Pressure bleeding is certainly the way to go. A pressure of 10 psi works well for me although FSM says higher for ABS-equipped cars. My bleeder was home-made from an inexpensive small garden sprayer. I wash it out with hot soapy water after using it and make sure it's dry before putting it away for "next time." I surround the reservoir with towels just in case there's a leak. Another possible problem I've heard about the "pump and hold" method is that the assistant pushes the pedal all the way to the floor; this pushes the piston into the unused and rough part of the master cylinder, possibly damaging the seal and causing future (internal) leaks. Jeremy
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#13
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Yah, the pressure bleeder is the way to go. Mine is a "Speedie Bleeder", gets air pressure from the R/F tire. I 'll be looking for a new one, the gauge is acting up.
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1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car" |
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