309 Master Cylinder

**turbojet427** · #1 01-10-2009, 08:43 PM

What is a "GA" coded 309 master cylinder for?

**Mr70** · #2 01-11-2009, 12:20 AM

Those were used on 1969 Firebirds w/power front disc brakes & rear drum.
Master cylinder casting #5468309,actual factory part #5469357
Coded GA
Primary piston has shallow push rod hole
Secondary piston identification has 3 rings
Bore diameter is 1.125"
Distribution 69/31
Port location/routing front-front/rear-rear
Port sizes front 1/2"x20,rear 9/16"x18
Line wrench size front and rear 9/16"

**turbojet427** · #3 01-11-2009, 01:49 AM

Thanks!!

**wheelhop** · #4 01-11-2009, 02:22 AM

Rick,
I think you need to get out more!!

Unreal · #5 01-11-2009, 08:50 PM

Hey Rick,
I have this crick in my back.......

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