I just changed the rear brake pads on my 1990 300e,
I bled the driver rear line first and it went well. I than
bled the passenger rear and thats where it all went
bad. At first I was getting a lot of air and fluid mix
than just air and now nothing. I even removed the
line from the caliper and tried to see if any fluid would
come out and...nothing. I than bled the fronts to see if
everything was working up there and they bled fine.
Is there any reset I have to do or any thing that
would prevent fluid from getting to the back lines?
The brakes worked perfect prior to this, I was doing
regular maintenance. Please please help.

Also I tried driving the car without back brakes
and the fronts worked perfect. I did lock up the front brakes
while driving, so does that mean the abs isn't working or has to be reset?

These cars ar very sensitive as to how the brakes are bled. If you used the "pump the brake pedal method" there are some people reporting problems doing it that way. The easiest and less damaging to the brake system for these car is the power bleed system which pushes the new fluid into the brake reservoir and by opening the bleed valves the old fluid comes out...

__________________
J.H.
'86 300E

I did the pump the pedal method for about an hour.

Sounds like you have run one of the segments of the reservoir for brake fluid on top of the master cylinder dry. Are any of your warning lights coming on? Should be one for low fluid and one for ABS malfunction. If not you may have an electrical problem too.

I believe all MB brakes in the last fifty years have a twin circuit so if a line breaks or leaks the whole braking function is not lost. The compromise is that one back brake line is fed from one compartment in the brake fluid reservoir and the other one from the other compartment. Check the fluid reservoir carefully. It has a vertical partition behind the fill opening intended to prevent the leaking circuit from draining all the fluid. It comes up pretty close to the top of the reservoir, which means you have to nearly fill the reservoir up into the filler cap neck, especially if the front of the car is sloped "down" compared to the rear.

Hope this helps. Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

Going to go try that now.....Thanx soooo much!!!!!
I'll let you know how I make out.

I too had a similar experience with my old 1993 300E 2.8. In the end, after having towed to the dealership (since i couldnt get a firm pedal) it turned out that the brake lines were dry rotted and my moving them around so much had caused a leak in one. Investigate it- As well, check to make sure neither of the calipers is leaking.

__________________
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Thanx for the help it worked like a charm. You definitely
made my weekend!!!!!! This forum is the best forum for Mercedes
I've tried several and no luck, but you guys had the answer in less than an hour! Thank you sooo much again, I will be looking forward to my next
auto adventure knowing you guys are here. lol

Ps thank you thank you thank you!!!!!!!

Glad the site was helpful to you. It has been very helpful to me over the years, and is still the first place I turn for "virtual experience" before I start a job that is new to me. Stick around, and you'll be helping others here soon enough.

How about your warning lights? Did your ABS light come on when you locked up the front brakes? How about the low fluid alarm lamp? Did it go on when the fluid was low? A light should have been on, on the warning strip below the instruments. Once you fill the reservoir back up the low level light goes off. Not sure if the ABS light is self extinguishing.

Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

The abs light came on when the brakes locked up.
No lights came on when I was low on fluid though.