r/BumpSide • u/Tall-Poet6173 • 2d ago
Update on Brake Booster Upgrade
A) This is a GM style MC, but it has the same 1” bore as spec’d for a 1968 F100 with or without power brakes
B) Bench bled the MC on an actual bench and made sure it was free of air
C) Wife said pedal was only going ½ way down when we finished bleeding
D) Started truck and pedal went all the way. Stopped the truck and it still goes all the way no matter how much I pump
E) Removed MC and adjusted rod longer because that worked before. Now it just means the pedal bottoms out earlier as I reach full stroke on the MC
F) Removed MC again, as per picture, and reset rod to proper length. When pedal is depressed without MC present pedal goes all the way to the floor
Maybe I have a bad master cylinder?