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Brake Booster: 11\" dual Diaphram  (GM  HD various)
Reviews

  This is a dual diaphram booster for various HD application where space and the need for extra booster function is warranted.  Fits up all normal master cylinders for disc brake application. Suitable for truck use.

  It comes with the holed pedal arm rod as shown.

   It has the 4 bolt typical late 60's - 70's Firewall bolt up pattern.

  Also used in light truck applications.

As an additional guide.. this might help people over time.... DONT JUST BLAME A PART

Don't have time to read this below ??.. but have a suspected booster issue.. then at LEAST read this link to the USA suppliers MBMbrakes who supply this stuff all day every day...https://mbmbrakes.com/brake-booster-diagnostics/