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Black stuff in master cylinder

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Michael Iwaki

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Feb 14, 2002, 2:08:37 AM2/14/02
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I worked on my brake system on my 76 Datsun B210 car. In the master
cylinder there is a black paste in the bottom of each cup that is filled
with brake fluid. What is this black stuff? Should I clean it out?

Michael Iwaki

mike (aka socalmike)

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Feb 14, 2002, 3:37:39 AM2/14/02
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"Michael Iwaki" <iw...@gte.net> wrote in message
news:3C6B6546...@gte.net...

> I worked on my brake system on my 76 Datsun B210 car. In the master
> cylinder there is a black paste in the bottom of each cup that is filled
> with brake fluid. What is this black stuff? Should I clean it out?

rubber debris, clean it out if you can.
>
> Michael Iwaki
>


Nate Nagel

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Feb 14, 2002, 8:33:11 AM2/14/02
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Michael Iwaki <iw...@gte.net> wrote in message news:<3C6B6546...@gte.net>...

Given the age of your car, I would definitely check and see if a
rebuild kit is available for your master cylinder. At that age there
is probably some corrosion in there and unless you pressure bleed the
system, when you go to bleed the brakes you will probably wipe out
your seals. A lot of people are scared of working on brakes, but I've
rebuilt a lot of hydraulics with pretty good success (mostly old
Studebakers, but they all work the same.) Only special tool you need
is a brake hone, available at your FLAPS. At the same time it would
be real easy to use a little extra Brakleen and get rid of any
nastiness that is evident.

To prevent occurrances like this in the future, change your brake
fluid every 2 years minimum. It sounds anal retentive but if you
stick to it barring unusual circumstances you should be able to go
indefinitely with only pad and rotor/drum changes.

good luck

nate

Mike...@lycos.com

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Feb 14, 2002, 10:27:20 AM2/14/02
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Iron. Purge and refill the system.

mike

Dan Lusk

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Feb 15, 2002, 6:34:29 PM2/15/02
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YEAH !


hogr...@hotmail.com

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Feb 15, 2002, 9:33:50 PM2/15/02
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I would replace the master cylinder. Then flush the entire system
with fresh brake fluid.

Don

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Mar 27, 2002, 1:53:15 PM3/27/02
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I would suck the old brake fluid out with a new turkey baster and clean the
black gunk out with a lint free rag and then replace and flush out the brake
fluid through the brake lines at the wheel cylinders.The black paste is dirt
and dust that has infected your system.Quite normal for an older car.


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