My chair was jerking as it moved, it had done this before. The tech showed me how to pull the brake lever up and then back down to get it to stop. I did this and the I did the screen said Brake 1 disconnected I have 34" doorways which makes a tight fit for my wheelchair. Sometimes the yellow brake lever that sticks out can get caught. One time it was bent going thru the doorway. I had to get a whole new brake system $500 for a used one. It wouldld have been $850 for a new one. Again my brake 1 is stuck in disconnected mode. It is the week-end and I will have to wait until Monday to call. I am praying it is not the same issue as before. I think to have such an important lever sticking out like it does is a very poor design. I really am not fond of this chair. Have anyone else had issues with the brakes pn Quantum 2.0 wheelchairs?