[DMCForum] Re: Urgent brake problem
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[DMCForum] Re: Urgent brake problem


This is rare but I've heard of it happening:

Could the seals between front/back resevoirs be bleeding by? The 
pressure just blows between resevoirs. There would be no leak.

Rich A.

--- In DMCForum@xxxxxxxxxxxxxxx, "Andrei Cular" <andreic@xxxx> wrote:
> Are you sure all the line fittings are tight?  Fluid doesn't 
> have to leak out for air to get in.  And did you install the 
reservoir or
> was it already installed?  Something else to look at is the push 
rod length.
> Make sure that it has the correct amount of freeplay.
> Andrei
> ----- Original Message ----- 
> From: "Walter Coe" <Whalt@xxxx>
> To: "DMCForum" <DMCForum@xxxxxxxxxxxxxxx>
> Sent: Wednesday, December 31, 2003 2:41 AM
> Subject: [DMCForum] Urgent brake problem
> > I just replaced the master cylinder on Jim Sleeth's car, and
> > it don't work.  Jim bought a rebuilt master cylinder from
> > NAPA.  We bench bled it, connected the lines, bled the
> > calipers in the proper order, etc.  Everything looks normal,
> > no fluid leaking anywhere.  If we let the system sit for
> > more than 15 seconds and then step on the pedal, it almost
> > goes to the floor.  With about 3 more pumps, it firms up
> > properly and stays firm for as long as we continue to pump
> > it.  But if we let it sit for more than 15 seconds then the
> > pedal goes soft again.  Apparently we just got a bad
> > cylinder from NAPA.  The original cylinder was leaking, so
> > that was the reason for getting into it.
> >
> > Can anyone say what could possibly be wrong in a master
> > cylinder to cause this?  Or could we be overlooking
> > something else?  I don't see how trapped air could cause
> > this symptom.  We bled the system by the good old-fashioned
> > two person way.  Jim pumped the pedal while I turned the
> > bleed screws.  We used up two pints of Castrol GTLMA dot 4
> > because we wanted to thoroughly flush out some Dot 3 he
> > dumped in there to make the car temporarily drivable (after
> > the reservoir went dry due to the old leaky master).  The
> > Dot 3 never touched the new master.  If it caused a problem
> > in the calipers, I suppose they would hang up or leak.  But
> > it isn't doing this.
> >
> > Walt
> >

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