Steve, yes the original master cylinder has a residual valve strong
enough to drag disk brakes. To be sure this is the problem, crack a
bleeder on one of the calipers. It should release the pressure and allow
the caliper to turn.
If it does not you may have binding calipers. If so, were they used
calipers? Did you put new bushings in for the slide pins? Are you SURE
the bushings are in just right?
Crack the bleeder 1st though, I'm 90% sure the residual valve is your problem.
Steve Hanberg wrote:
> So, with the new brakes in place, I bled the brakes. Before bleeding the
> rotors would turn with just a tiny bit of drag. After bleeding I can't turn
> the rotors at all unless I use a tool or tire to gain some leverage, and then
> I have far more drag than seems appropriate.
>
> Until a few minutes ago it never occured to me that the original master
> cylinder might have a ten pound residual valve, for the drum brakes. If it
> does, that would explain why my disk brakes are lightly applied once I've put
> any pressure to them at all.
>
> Does anyone know if that is the case? If it isn't the case I may have some
> other problem, though since they seemed fine before I pressed the peddle the
> first time, that seems unlikely.
>
> Steve@OldSub.com
> www.oldsub.com to see all three of my old trucks...
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
--
John Dorsey
Wauchula FL
http://www.strato.net/~jrdorsey
'49 3800 Chevy Panel
'52 640 GMC Firetruck
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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