I bought a "Power Bleeder" to flush my brake system, it tells you to put some presure on the system before bleeding to spot leaks. Sure I have some leaks; fluid is coming out of the two black knops on top of the reservoir (see picture), is this normal or do I have to replace the reservoir?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

I have a pressure bleeder and have never had the low level light sensors leak while the system is pressurized. Don't use more than 20psi to pressurize the system.
You may have to replace the reservoir.

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

Jorn

Its common for those to leak when you use your pressure bleeder for the first time. Those rubber "caps" are available at the dealer or Fastlane. Pry the old ones off and replace them.

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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"

I'm glad to hear that, up to the dealer tomorrow morning. Thanks

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Mine seem to leak when you press on
them.
Some time ago I was trying to sort out
the vac system and I was leaning on
them with my arm.
They started to leak brake fluid.

Is this the way it should be or do
I need to replace the rubber caps?

Thanks for any info.

Louis.

Just came back from the Dealer; I'm always amazed what they have in stock, but there prizes: $21,95 for 4 rubbers!

I had set my mind on doing it this weekend, otherwise I would have called Fastlane.

I'm going to take the reservoir of the master cylinder to replace the seals and to clean the reservoir, what's best and save to use; mineral spirit?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Glad those rubbers where leaking, the reservoir is full with smudge, and all the rubbers where cracking

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Jorn

"what's best and save to use;" I use soap and hot water to clean them out.

Steve

That's what I did, I left it soaking for an hour in warm water with some dish soap but still there was some "smudge" left in the little chamber that I could not get rid off. The reservoir was really dirty, the complete inside bottom was black!

The weird thing was that the fluid in the reservoir was dark brown almost black, the fluid that came out of the right rear had brownish tone with almost no smudge, but all the other lines the fluid that came out was yellow and clear. After I reinstalled the reservoir I topped it of with new brake fluid.

Now another question; I used two liters of DOT-4, but when I cleaned the fill cap, it shows on top: "Use only DOT-3", did I use the wrong grade?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).

Jorn

Dot 4s the right stuff. Good to get all that nasty crap out of the system.
Steve