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RE: Bomb replacement problem
While I would never even consider reusing a bomb (if you want to save money
have your original unit repressurized ... someone on the list offered such a
service), but the problem you describe could not be caused by a bad bomb
alone (IMO). It sounds to me that your brake boost system is now completely
non-functional. Are you getting steering assist? If not your pump isn't
pumping. If you get steering assist, the pump may still be bad, or the
system may have been reassembled incorrectly or it is now clogged. You
might want to try reinstalling your old bomb for a test ...
San Jose, CA (USA)
> From: Adam and Soma Dixon[SMTP:firstname.lastname@example.org]
> Sent: Monday, July 19, 1999 8:57 AM
> To: email@example.com
> Subject: Bomb replacement problem
> I recently had the master cylinder replaced on my '89 100 and was told
> that the pressure accumulator was bad. I have noticed for several months
> the brake light activating for several seconds after braking. Based on
> these data, I obtained a replacement accumulator (matching Audi p/n as
> original, newer style with O-rings instead of crush washers) from DADS
> recycling and attempted the job myself. I followed the procedure detailed
> at: http://20v.org/brakprob.htm#bomb and now find that the brake light
> stays on all the time, braking force is greatly decreased (heavy pedal
> force required for basic stopping) and steering side-to-side is also
> difficult (I am avoiding driving it until I know what may be wrong).
> Although approx. 1 liter of pentosin (green 7.1 type) was recovered
> between emptying the reservoir and disconnecting the hose from the front
> of the accumulator, only approx. 0.25 liter was sucked back in during 8 or
> 9 minutes instead of the typical 5 minutes of idling during the refill
> process. That was the first clue that something was wrong. I performed
> five cycles of lock-to-lock steering for self-bleeding and noticed the
> pentosin level drop but still used nowhere near the 0.5 to 1.0 liter
> estimated in the instructions. I see no evidence of leaks and am trying
> to figure out where I messed up.
> 1) I didn't follow the correct process?
> 2) bad replacement accumulator?
> 3) other ideas?
> I would appreciate any ideas!!! Thanks.
> Adam Dixon
> '89 100