[s-cars] Hydraulic system problem/questions - long

[Mike Claire]

On Thu, 9 Dec 2004 11:22:17 -0800 (PST), chris chambers
<fastscirocco_2000 at yahoo.com> wrote:
> Scar nutz,
> 
> Been having a problem for some time now, I'll recap in detail with as
> much info as possible.
> 
> When I purchased my 93 S4 ~3 years ago I had the infamous brake light
> staying on for a little while. Slowly but steadily the light stayed on
> longer and longer.
> 
> Eventually the light began to blink at times and I could feel a
> "vibration" through the brake pedal when first starting the car for a
> couple minutes.
> 
> Wanting to fix this I ordered a bomb and installed it. After I replaced
> the bomb and hydraulic fluid I was bleading the system when a seperate
> hydraulic line "popped" off.  I shut down the car immediately but the
> system emptied itself of most of the hydraulic fluid, yes it went
> everywhere.
> 
> I re-installed the hydraulic line with a new clamp, replaced the fluid
> and bled the system. The brakes were great and the light never came on.
> Well ~2 weeks later a hydraulic leak showed up, short story it was the
> seal under the "plug" on the side of the bomb. I re-installed my old
> bomb as a stop-gap until I could get the new one replaced. Imagine my
> surprise when the brake light did not come on at all, and braking was
> great!
> 
> Had my tie rod ends replaced due to some "play" int he front end. But
> after the alignment I still felt "play"...or a dead spot in the center
> of my steering.
> 
> Well about 2 weeks later the brake light started coming on....GRRRR So
> believing I had "junk" in my hydraulic system I flushed it, twice.
> Brake light went away and everything was great, it also solved my
> "play" in my front end, for about a week.
> 
> OK, I decide my bomb myst be weak, and got a used one from a fellow
> lister parting out his wrecked S4 (soon to buy a coupe in Canada).
> Brake light goes away, for a week. Flushed the system again, same
> thing.....brake light re-appeared after one day and steering got that
> "play" back..
> 
> So, do I have junk in my hydraulic system or is it a bad bomb and the
> flush somehow "fixes" it for a short period of time?
> 
> Thanks for your input, I don't want to buy a bomb I don't need.
> Chris
> 
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BTDT - and I suspect it is your brake servo.  Mine was just like that,
and I too replaced the bomb.  No help, and eventually after a sharp
stab on the brakes one day the light stayed on  and the vibration
became intense.  I bought a used one from Force 5.

Mike