[s-cars] No Brake Assist

[J R]

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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