Brakes on trek 7300 locked up, how do you release?

DeForest Kelley appeared as Dr. McCoy in Star Trek: The Next Generation: Encounter at Farpoint (#1.1). Leonard Nimoy appeared as Spock in Star Trek: The Next Generation: Unification I (#5.7) and Star Trek: The Next Generation: Unification II (#5.8). His appearance was tied to the release of the film Star Trek VI: The Undiscovered Country. Mark Lenard appeared as Sarek in Star Trek: The Next Generation: Sarek (#3.23) and Star Trek: The Next Generation: Unification I (#5.7). James Doohan appeared as Scotty in Star Trek: The Next Generation: Relics (#6.4). Majel Barrett appeared as Federation Computer Voice (nearly all episodes) and Lwaxana Troi (8 episodes) in Star Trek: The Next Generation. Diana Muldaur who appeared as Dr. Miranda Jones in episode Star Trek: Is There in Truth No Beauty? (#3.5) and as Ann Mulhall in episode Star Trek: Return to Tomorrow (#2.20) of Star Trek, appeared as Doctor Pulaski, a recurring character, in most episodes of season 2 of Star Trek: The Next Generation, replacing Doctor Beverly Crusher (Gates McFadden) as Chief Medical Officer.

If the wheels spin free then I would look at the bottom bracket. All of the force you use for pedaling relies on the bearings in the bottom bracket being good. Are the pedals hard to turn by hand? Do the pedals themselves spin freely? If the wheels turn, this really only leaves these two rotating points as possible suspects.

Contact local trek dealer

Very simple but make sure you get properly fitting replacement chainrings as they have different bcd measurements eg: 110mm or 130mm
You have to remove Allen bolts whilst stabilising the rear with broad flathead screwdriver. Simply take off old ring and place new ring onto spider.
Use torque wrench to tighten if you have one
Your best bet actually is to buy them and ask seller to fit if you are unsure.

There is an adjuster where cable enters brake caliper
Also you could loosen mounting bolt. Realign and tighten.

So, what's the question?

put the chain on front side peddal on the smallest gear.
unlock the rear wheel and tap on side wheel whit your hand.

Brake bleeding can be a long, messy process. With the reservoir open and full, apply brake and hold it. Now loosen the bleeder valve and let fluid drain until the flow stops or the brake lever compresses. KEEP HOLDING THE BRAKE LEVER, now close the bleeder valve. Now release brake lever. Fill reservoir again, repeat until all bubbles come out of the line and you get restored brake tension. It could take awhile. By the way, what happened such that you lost braking to begin with?

No you can' its built into the mother board.

1- power off the printer and make sure the indicator is not red.

2- Remove the drums and waste box
3- Remove the front door by sliding it left after releasing the two stoppers (turning them 90°) and sliding the left hinge to the left (after loosening a screw).

4- Release the green Synchronozing Roller lock levers (2).
Release the black Secondary Image Transfer lock levers (2).
Release the green Secondary Image Transfer lock lever (2).

5- release the sensor assy by turning it 90° and loosen two screws to release the belt.

6- You can now pull the belt out of the printer and replace it with a new one following the reverse procedure.