[urq] cast brake booster .

[racingiron at comcast.net]

Patrick Carlier wrote: 
> I'm missing the blak part on the rigt side of the main spring . 
> The spring I was referring to is on the rigt side of the pushrod . 
> And the ring on the right side of the pushrod is missing to . 
I'm not sure that little spring and the ring are absolutely necessary. The aluminum booster doesn't have those parts: 
http://www.quattro.ca/Urq/Brake_servo_guide.pdf 
The spring seat on the right side of the main spring is definitely important. It causes the spring to rest against the pressure plug (the little piece with the single o-ring). Without that, the spring is seated directly against the operating piston. You can see some good cross-section diagrams of the (iron) booster in this IST document at Martin's site, near the end of the document: 
http://www.quattro.ca/Urq/urq-IST-Introduction.pdf 


> Anyone have a spare or broken booster available where I 
> could salvage the missing parts . 
I have a spare spring seat you can have. It's from an Aluminum BMW booster (internally identical to the Al urq booster), but I suspect it's the same as the one you're missing except for the color. Send me a personal email with your address and I'll get it out to you. 

Eric R. 
'86 urq 
'92 urS 
'93 urS