[s-cars] No Brake Assist

[Robert Myers]

*This message was transferred with a trial version of CommuniGate(r) Pro*

It's possible that your PS pump may be dead.  A dead pump would also 
show as a dead bomb.  The bomb is the "usual" fault but...  You've 
been working on the PS pump and something may have been screwed up in 
the process.

Uh, you did replace the lost fluid with pentosin "green gold" 
hydraulic fluid and not brake fluid - right?

Bob


At 05:20 PM 10/23/2010, J R wrote:
>*This message was transferred with a trial version of CommuniGate(r) Pro*
>So do you suppose it's just a coincidence that this happened right when I
>did an X-plug replacement on the PS pump and an alternator swap?  I'm fine
>with that, I just want to know that it isn't something I did during those
>repairs.  Would me moving the hose from the PS pump to the bomb (J-hose?)
>around, possibly causing a leak in that hose, produce the same symptoms?  I
>checked both the bolt on the pump and the bolt on the bomb for this hose and
>neither were even slightly loose.
>
>Thanks,
>
>JR
>
>
>On Sat, Oct 23, 2010 at 4:10 PM, Robert Myers <bob at chips-ur-s.com> wrote:
>
> >
> > The bomb is a structure vaguely reminiscent of the old German potato masher
> > hand grenade of WWII.  It has a highly pressurized portion separated from
> > the  hydraulic fluid by a membrane.  The PS pump pressurizes the PS fluid
> > which "back flows" into the bomb against the diaphragm which 
> maintains brake
> > assist when the PS pump is not working (typically when the engine quits but
> > it can also happen if the PS pump dies).  The test for a bad bomb it to let
> > the system pressurize as engine runs.  Then turn off engine and repeatedly
> > (counting) press the brake pedal until the pedal gets hard.  30+ 
> the bomb is
> > good.  20 or so keep watch on it.  10 - plan on repairs soon.  5 or less do
> > it now.  Your test result is zero pumps.  Most likely the internal bomb
> > diaphragm has ruptured but it may be possible to install a valve and
> > repressurize the high pressure side of the bomb.
> >
> >
> >
> > At 04:58 PM 10/23/2010, J R wrote:
> >
> > The hose from the pump to the bomb is right there where the alternator goes
> > in and out.  Could it be leaking?  I'm sure I moved it around when pulling
> > and reinstalling the alternator.  I don't see any fluid leaking anywhere
> > since I replaced the X-plug.
> >
> > JR
> >
> >
> > On Sat, Oct 23, 2010 at 3:49 PM, Robert Myers <bob at chips-ur-s.com> wrote:
> >  *This message was transferred with a trial version of CommuniGate(r) Pro*
> >
> > It sounds like you now have no braking power assist at all.  Your brake
> > pressure accumulator (your "bomb") may be totally dead - or - your PS pump
> > may be totally dead.  The total loss of assist is the test for a bad bomb.
> >
> > At 03:47 PM 10/23/2010, you wrote:
> >  *This message was transferred with a trial version of CommuniGate(r) Pro*
> >
> > I replaced my alternator and the X-Plug on my PS pump, and ever since I
> > have
> > no brake assist at all.  The brake light is on all the time.  The pedal is
> > as hard as a rock and it is very very hard to stop the car.  Power steering
> > is fine.  PS and brake fluid levels are fine.  Anyone have any idea what I
> > might have bumped, broken or done wrong that would cause this?
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