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#1
12-22-2006, 01:25 PM
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W123-Brake Fluid Reservoir Question
On top of the brake fluid reservoirs on my W123 300D's are two buttons and an electrical connection at each one. What are these buttons and wire for?
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#2
12-22-2006, 01:30 PM
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Fluid level warning sensors and resets?
John
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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!
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#3
12-22-2006, 02:43 PM
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Each black button is the reservoir fluid level sensor. Each compartment is measured independently. When the level is low each switch will turn on the Red "Brake" light on the dash to let you know that the fluid in one or both of the chambers is low.
Pressing on the black rubber button top will test the contacts and turn on the red "Brake" light in the dash. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#4
12-22-2006, 02:44 PM
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Quote:
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K
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#5
12-22-2006, 03:17 PM
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Quote:
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#6
12-22-2006, 05:52 PM
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Quote:
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Jimmy L. '05 Acura TL 6MT  2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China"  Scar engine installed'81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John
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#7
12-22-2006, 05:54 PM
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my question exactly
I was just going to ask about the front back or cross. I let the rear get low (leak?) and I bleed the passanger rear but that only got me a minimal amount of break action. I should just do a complete brake inspection but it is cold here. Have not been in any hurry as I was not going to drive it. Well there is no snow here in Michigan (yet) and my son is coming home from college and we might need it.
The warning lights did not come on and I had topped it off just a couple weeks before. I have not found any sign of a break fluid leak, but it leaks so much oil, it would be hard to tell. No sign around the wheels, anyway. What is up with Braingear?
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1982 300D 135K 1986 300SDL 145K 1996 GMC Suburban 4x4 winter/tow vechicle 1989 Sunsation 24(ft) 454 65 MPH :fork_off: 1997 Aurora 82K
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#8
12-23-2006, 07:55 AM
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Quote:
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#9
12-23-2006, 12:23 PM
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front and rear
I think JIMMYL is saying that the front chamber is for the front two wheels and the rear is for the rear wheels.
This will narrow down my search for a leak. Thanks
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1982 300D 135K 1986 300SDL 145K 1996 GMC Suburban 4x4 winter/tow vechicle 1989 Sunsation 24(ft) 454 65 MPH :fork_off: 1997 Aurora 82K
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#10
12-23-2006, 01:14 PM
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Lots of fluid disappearing but not visible would lead me to suspect a brake booster leak. It goes in the booster case but does not leak out. This is the most likely candidate if you cannot find the fluid anywhere else.
Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car Last edited by dmorrison; 12-23-2006 at 02:45 PM.
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#11
12-23-2006, 03:28 PM
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brake booster, hmmmm
Thanks Dave, that is the kind of tip I was hopping for.
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1982 300D 135K 1986 300SDL 145K 1996 GMC Suburban 4x4 winter/tow vechicle 1989 Sunsation 24(ft) 454 65 MPH :fork_off: 1997 Aurora 82K
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#12
12-23-2006, 05:00 PM
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Let me clarify that statement. The master cylinder is leaking into the brake booster. Where is attach's is an Oring between the booster and master cylinder. If the orings INSIDE the master cylinder are leaking the route that the fluid will take is to drip into the booster, not past the large flat oring between the MC and booster. So the only place it can go is into the booster cavity.
I realize I made it sound like the booster would be leaking. It is just vacuum controlled, no brake fluid goes into the booster in normal operations. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#13
12-23-2006, 09:43 PM
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Thats clear
I think I was clear befor your last post
 . But now I think you might have exsplained why I thought it was my master cylinder before I noticed the fluid level going down (pedel going down at red lights). Fluid loss lead me to think leak. You might have explained why it is Both. I can stop looking at wheels and lines. Thanks again
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1982 300D 135K 1986 300SDL 145K 1996 GMC Suburban 4x4 winter/tow vechicle 1989 Sunsation 24(ft) 454 65 MPH :fork_off: 1997 Aurora 82K
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#14
12-29-2006, 01:39 AM
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I have a leak where the bottom of the reservoir where the rubber seal meets with the cylinder - is it possible to just replace the groments that connects the reservoir to the master cylinder?
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'80 300SD - 315,xxx miles, '79 300SD - 199,xxx miles
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Linear Mode
