[urq] cast brake booster .

[Patrick Carlier]

A few day's back I noticed an atf leak at the brake pedal . 
I've got the very early style brake booster . The cast one , not the alloy . 
So I took it apart , and replaced two o-rings and an oil seal . 
Put it all back together again and the leak is gone . 
Brakes work fine . 

But now I have a kind of hissing sound when I release the brake pedal . 
Lasts a couple of seconds sometimes . 

So I took it apart again to check . 
And I found a badly damaged spring , stuck around the main spring . 
It looks like it must have been half an inch in dial . 
Thin gauge , 1 mm maybe . And 8 or 9 windings . 

Problem is I haven't got a clue where it came from 
Moste likely I pushed it loose when I put the main 
spring back in . 

I assume it biases somekind of check valve or something 
wich now causes the hissing sound . 
I can make a new spring , but I still need to know where it came from . 


As usual , all help appreciated 
Pat