67-72 GM Truck, Power Booster Kit

January 21st, 2009

1967-72 GMC TRUCK and CHEVY TRUCK POWER BRAKE BOOSTER KIT (BB-11-6772T) 16667

STEPS: Read these instructions carefully!
IMPORTANT: This kit is assembled for shipping
purposes only! Be sure to check all nuts and bolts for adequate torque prior to use. Don’t forget!

  1. Remove original master cylinder, pedal clevis and hard lines.
  2. Remove master cylinder from power booster as you will need to bench bleed it prior to bleeding the system. Inexpensive bleeder kits are available at any auto parts store for minimal cost. We also sell a bleeder kit. Install your pedal clevis onto booster. NOTE: Booster pushrod may need to be trimmed to fit.
  3. Install the booster onto the original studs that mounted the original master cylinder to the firewall. You will find that there is a second set of studs in the firewall from the factory for this purpose. NOTE: SOME FIREWALL STUDS WERE COURSE THREAD AND SOME WERE FINE THREAD, YOU WILL NEED TO SUPPLY THE APPROPRIATE NUTS FOR THE INSTALLATION!
  4. There should be two pedal clevis holes in the brake pedal. Mount the heim joint onto the lower hole with supplied thick washer between the pedal and heim joint. Mount the clevis into the lower hole and check for proper adjustment by making sure the brake pedal is all the way up and no pressure is being applied to the booster. Be sure to tighten the clevis jam nut.
  5. Mount your bench bled master cylinder to the power booster. Connect all appropriate hard lines and bleed the system.
  6. If you are running disc brakes be sure to have the proper proportioning valve kit for your application.
  7. Double check all of your work and proceed to check the system for any leaks.
  8. Be sure to hook up your vacuum line to the appropriate port on the manifold.

Recommendations:

  1. We highly recommend that you perform a vacuum check on your particular engine. Acceptable vacuum numbers would be from 15in/hg to 22in/hg. For those who have lower numbers we offer a vacuum pump. Call for details.
  2. We also offer disc brake master cylinders and proportioning valves for those who do not want to run power brakes. Call for details.
 

2 Responses

  1. Gerald Breitenbach says:

    I installed a BB2-11-6772T and now have rear brakes getting hot after 5 miles or so, plenty of free play before booster, master cylinder has slight pressure applied to it from booster. Push rod had been roughly ground off, not much room to grind more, hate to washer out the master cylinder to get the clearance i need.

  2. Gerald Breitenbach says:

    Washers between master cylinder and booster cures rear brake drag now whats the fix?

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