<VV> too much brake pedal travel

[djtcz at comcast.net]

snipped and bottom posted 

-------------- Original message -------------- 
From: Brad Hall <rbh3794 at yahoo.ca>
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.? 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? 


==================================================
It could be pad knockback from rotor runout or real loose wheel bearings, but that square O-ring  ( []-ring?) used  in disc brakes does not retract very much on its own.

The 1969 IH scout (all drums, dual circuit) MC I rebuilt last weekend had a "residual pressure" valve in each output port. Each residual pressure valve was formed by assembling a rubber seal thing backed up by a steel dish with holes in it, re-using the original weak coil spring, and installing right side up.
http://scoutparts.com/products/photos/14662_234550.jpg

A buddy rebuilt the MC on his old drum brake Ford Mustang and  the brakes went to the floor. He got them working right when he put the residual pressure valve back in.  That was the first time I'd ever heard of one.


Dan Timberlake 
Westford, Massachusetts, USA