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Re: PC800: Brake Fluid Replacement
Written by Alan Taylor on 8/5/1997 at 07:24 pm

Richard A Hardy wrote:

> Hi Guys;
>
> I read somewhere that you should have a
> vacuum pump to do this job, i.e., suck the fluid out instead of
> "pushing"
> it out. Question: Is there any reason *not* to use the tube & jar
> method?

Pumping the brake wears on the master cylinder piston and seals. This is
aggravated by the lack of lubricant in the form of brake fluid. Using a
vacuum bleeder eliminates this problem. How much difference in wear is
hard to say, and the price of the bleeder may well equal a master
cylinder rebuild.

> I intend to simply loosen and pump out through the bleeder valve.
> But, I also have a vague recollection from some source that the hose
> from the master cylinder should be disconnected from the brake and the
>
> fluid pumped out there.

It sometimes happens when you drain a hydraulic system that the M/C will
become air bound, pockets of air prevent fluid from entering the system.
In the rare event that that happens, you will have to disconnect the
lines from the M/C t bledd it first, then re connect (With new seals)
and finish bleeding the system.

> So, my second question is:
> Is it OK to empty the old fluid by pumping it out the bleeder fitting
> with the brake lever?

Yes provided you remember to shut the bleeder valve before pumping, as
GK advised, and dispose of the fluid in an environmentally sound manner.

>
>

Alan Taylor
95 PC800 Midnight
Long Beach, CA


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