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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jul 2000 Posts: 2,195 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,195 | The master cylinder has a stop (C clip) that prevents the piston from coming out. The factory setup had a rod that is attached to the piston. This push/pull rod is attached to the brake pedal. Adjusting the length of this rod gives you the clearance that is specified.
If you change the master cylinder to a more modern one where the rod is not attached to the piston so it's simply a push only rod, then the pedal can be pulled back by the external spring and it can contact the cab. (or stopped by the brake light switch)
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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