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Re: S-Cam Brake Shoes - Primary and Secondary?
Posted to HD/Fleet Forum on 6/20/2019

Hello James!

As others have posted all the air brakes I have seen over the years are non servo brakes - each shoe is actuated by the "S" cam and has it's own anchor.

primary and secondary shoes have only one (1) anchor, that the secondary presses against. ... Login to read more.