Rear brake lock up on 2019 sportster

[Sawncm1]

I own a 2019 sportster iron 1200. I installed a new exhaust system now the rear brake is locking up and the lever is stiff.

[Hossamania]

Double check your work, do you have a long bolt or heat shield clamp hitting the mechanism somewhere? Did you force something when fitting it, possibly bending something?

[Sawncm1]

The pipes are up high so no clamps could reach. I forgot to mention that this happened when I first put the pipes on a couple days ago and all I did was readjust the linkage and it was fine. This time the brake engaged while out riding.

[hbkeith]

like Hoss said , and might want to check some more

[Ohio HD]

Is the new exhaust closer to the master cylinder? Heating up the brake fluid causes it to boil and expand, applying the brakes. Does the brake release when everything is cool?