<VV> a new brake question

[N6nev at aol.com]

When installing  front disc brakes, on a 4 wheel drum system, you need  a 
residual check valve for the rear brakes, The purpose is to hold 2 or 3 psi in  
the system when at rest.  The master cylinder for 4 wheel system has the  check 
valve in the master cylinder for that very purpose...When the check valve  
fails the pedal will go to the floor and then pump up....I use a proportioning  
valve which will include a residual check valve for the rears, then you can 
dial  in the braking pressure to the rears... Larry
 
 
In a message dated 10/30/2008 3:47:55 A.M. Pacific Daylight Time,  
rbh3794 at yahoo.ca writes:

I have a  '65 coupe here with new disc brakes on the front, new wheel cyls, 
new hoses  all around, all new steel lines, new master cyl, new shoes, pads, in 
other  words, the total brake system is new.  The brakes work very well, but  
when you first push down the pedal, it goes almost to the floor.   After the 
first push, all is o.k.  I bench bled the master cyl, and  then bled twice on 
the car.  There are absolutely no leaks at any of the  joints, hoses, lines, 
cyls.  My diagnosis was that the master cyl was  leaking internally, so I put 
another new master cyl on, didn't bench bleed it,  bled the brakes, and have 
the same problem.  Can it be that the front  discs are backing away from the 
pads, and require lots of fluid to get back to  their braking position?  Any help 
would really be  appreciated.

Thanks

Brad Hall
Corsa Ontario   


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