Posted by Wilamayb on May 13, 2012 at 18:15:21 from (71.15.151.11):
I've recently installed disk brakes on the front my 1967 F350 DRW. The brakes came off a 69 F350. They are dual piston calipers. The calipers, pads and lines are new. It has drum brakes on the rear but they are not factory. It now has a 14 bolt Corporate (GM) rear differential. Brakes on the rear are also totally new excluding the drums. The Master cylinder (new) and proportioning valve were also replaced to facilitate the disk fronts.
The rear brakes are set up to the drums as they should be. The brakes have been bled so that no air comes out of any bleeder.
The problem is, that when driving, the first time the brakes are commanded, the pedal goes to the floor. If it is pumped twice, normal pedal is achieved. The brakes are GREAT after the pedal is pumped. After being pumped the pedal is not soft. It feels just like it should. After pumping the truck will stop on a dime and stops evenly.
Any thoughts? Its almost as if the master cylinder is not supplying adequate volume....
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