Re: Bomb problems

[John Graham <jgraham1@erols.com>]

JIM_WARREN@HP-FtCollins-om4.om.hp.com wrote:

> Item Subject: cc:Mail Text
>
>      >This does not sound like a failing bomb simply because the bomb
>      >itself consists of 1 part. It is a rubber bladder pressurized to
>
>      >57bar. I would think that it either works, or it does not.
>
>      This is what I thought, so I didn't understand how this could be
> an
>      intermittent problem.
>
>      >Does your bomb hold pressure overnight?
>
>      Sometimes it does, sometimes it doesn't.  Ratio is about 50:50
> today.
>
>      >When you turn the engine on in the morning is the brake warning
> light
>      >on(E-brake not applied)? The bomb should hold the pressure
> overnight.
>
>      Yes, the brake light stays on for 15-30 seconds after releasing
> the
>      e-brake.  This only happens after the car has sit for a few
> hours.
>      But my car (92 S4) has done this for 3 years since I bought it.
>      Everytime I took it to the dealer for warranty service, I
> complained
>      about this and they told me that all S4s do this and there is no
> fix.
>      Other S4 owners that I have talked to confirm this.
>
>      My theory is that the pressure is somehow leaking through the
> booster
>      unit mounted between the master cylinder and the firewall.  Does
> this
>      sound plausible?
>
>      Jim Warren

 The spec. for the bomb is to 1885 psi  for five minutes. If it can't
hold 1885 psi for 5 minutes, replace it.
Thats it, bad check valve.  Sorry no over night test.

John
1990 CQ