02' Denali Cruise Control, brake booster problem!

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Yukon09

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I recently purchased my 2002 Denali, love it!!!
Cruise control was not working, after checking the fuses, I found out it was missing a 10amp fuse, it says on the fuse cover it is for brake!
I put the fuse in the missing spot, and cruise control started to work,
But now when I hit the brakes, when it's almost coming to a stop, the brake pedal gets stiff!!
When I remove the fuse NO cruise control and NO brake problem!
Brake lights work without the fuse also!!

Any help would be great!
Anyone know what that brake fuse controls?
I would like to fix it.
 

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