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2018 SM rear brake cylinder question

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So I bought a brand new SM last month and immediately started modding it. I installed the Zeta Trigger brake pedal and in doing so took it upon myself to lower the position of the brake pedal a bit becaus I found that it was uncomfortably high in the factory position. 

 

My question is in doing so I noticed the stud the brake clevis rides on has 3 nuts. One in the clevis, one directly on top to lock its position, and a 3rd half way tucked in the boot of the master cylinder. What does that 3rd one do because I accidentally moved it a bit when I was changing the height of the clevis. Does this affect slack in the pedal before it contacts the piston or what?

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The bolt that bottoms on the brake light switch underneath the bike adjusts the pedal position.

That top nut is the shaft on the brake cylinder piston. By adjusting the piston position, the shaft in relation to the clevis, you can change where the brake begins to engage independent of pedal position.

 

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