[urq] Brake Booster

[Eric Renneisen]

Mike wrote:
> ETKA shows two part numbers for the Brake 
> Booster, 857612107A and 859612107. I was 
> told that the 107A unit is available. Will 
> that work in my early build 83 #459? 

Careful reading of the Family Album will reveal that the 859- P/N is for
the '88+ urqs with a different hydraulic system.  The first number you
list is correct for the USA.  Hold on to your hat before requesting a
price quote, though.  You're not gonna want to spend that kind of dough
without a good reason.

> I've replaced the parts a a preventative 
> measure, and the brakes work ok, but they 
> feel a bit spongey even after bleeding and 
> replacing the brake fluid. 

Spongy compared to what?  If you're used to the stock calipers, the
slightly more pedal travel with the G60s might be what you sense.  If
not, how did you bleed?  I'd be certain all the air is out before going
further.

> What tells me that the Booster could be on 
> it's way out is that I see a small amount 
> of ATF leaking on the screw/stop located on 
> the bottom of the booster. Any suggestions?

That ATF leak is simply telling you that you own an urq (they all do it
eventually).  The booster isn't dead, it just needs a rebuild (1/10th
the price of replacement).  Check archives from a couple of weeks ago.

Eric Renneisen
'93 S4
'86 urq
Chattanooga, TN