Not sure on the brakes but check your mono valve for the heat. Pull the valve and see if the rubber diaphragm is split. You can buy a new rebuild kit from this site or go to a junk yard and see what you can see.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon