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73-87 Chevy _ GMC Trucks => Brakes, Frame, Steering & Suspension => Brakes and Braking Systems => Topic started by: low3+3 on September 19, 2009, 11:58:08 am

Title: need brake help
Post by: low3+3 on September 19, 2009, 11:58:08 am
(85 swb crew cab 1/2 ton on bags)i put new stock  calipers and rotors on the front and ford 9 inch from 76 lincoln versilles in the rear(disk brakes with 5 on5 pattern ) and whn i hooked up the rear and tried to bleed everything the rear calipers will not lock up. i have a proportioning valve on the front cross member that all my lines go to and i was thinking of pluging off the lines to the rear and running a new rear brake line staight from the master cyl with an adjustible prop valve from summit. i think the prob is that my master cyl has enough pressure but not enough volume through that stok prop valve to lock up those large calipers hope someone agrees,btw stock booster and master cly from a 91 c 10 thanks
Title: Re: need brake help
Post by: VileZambonie on September 19, 2009, 04:39:04 pm
If you are using the factory combination valve it will limit the pressure ata bout 600 psi.
Title: Re: need brake help
Post by: low3+3 on September 20, 2009, 03:58:50 pm
so do you think bypassing the combo valve may help
Title: Re: need brake help
Post by: Captkaos on September 20, 2009, 06:08:17 pm
You really need a disc/disc combo valve in there.