I bought new rubber seals for the MC reservoir on our '85 300D - they came today. Removed reservoir and noticed that although it looked full, the rear section was almost empty. Not sure why alarm did not register.

Question - why would front section (where Max-Min marks are) be full and back section empty when it is only possible to fill the back section? Is there an overflow?

I decided to remove MC while I was about it and check for fluid in booster. Good news - Found none!

Questions - The front MC port has a small disk inside, while the rear port does not. Anyone know if this should be like this? What does the disk do? The front port does seem to have a small pin that points up on one side that the disk rests on - the back port does not have that.

Here is a picture - I took disk out so it would be easier to see it:



Now need to go and get some fluid and maybe a gasket for MC.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

With the manual tranny cars the rear chamber supplies the clutch master cylinder and if the level goes down low enough the clutch quits working before the brakes supplied by that chamber, quit. The fluid over flows into the rear chamber. Dont know about the disc.

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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"

Thanks Steve,

So I guess when you check the level, you are really checking the front brake level, which makes some sense.

My car is an auto, so maybe rear brakes were not working any way! Fluid had leaked out of rubber grommet and there was only about 1/4" left.

Still wondering about that disk! Anyone?

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5