[urq] 85 - Brake conversion questions

[Felix Tang]

My 85 Urq starting having problems with brakes not releasing, they 
either drag or stay fully locked.  This was intermittent at first but 
got worse over time.  It's been at the shop for a while and they 
diagnosed it as a faulty brake servo (not the bomb).  This part is 
unobtanium and has been quoted at between $700 and $1200, if it were 
available.   So my questions/choices are:

1. Keep looking for a LHD brake servo.  Does anyone know of a source?

2. Rebuild it.  There was some posts recently about a rebuilt kit 
consisting of O-rings.  Is this normally what's needed?

3.  Convert to A4 brakes and a vacuum system.  While this means the car 
iwill no longer be "stock", it may be the best long term option 
considering a lack of parts for the factory system.  I've searched the 
Audifans archive, AW and used The Google but have not been able to find 
a comprehensive list of parts and procedures to do this.  There was also 
a question about UrS6 or V8 bits for the rear and may TT pieces for the 
front.  I'm looking for a system that will fit under the 15" R8 rims, 
preserve brake bias and hopefully "bolt-on".  Would appreciate any links 
or suggestions.

Thanks,
- Felix