It's possible he didn't properly bench bleed the master cylinder before installing it.

Welcome to the Stovebolt Forums. There is a forum just for big trucks like yours named Big Bolts. I'm moving your post there.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.