Help with a Physics car project please

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A group of students is designing a car with a wingnut braking mechanism but is facing issues where the threaded rod and wheels shift left instead of the wingnut stopping the rotation. The right wheel hitting the wood is what actually stops the vehicle. Suggestions include providing a detailed description of the braking mechanism and drawing a diagram to clarify the arrangement of parts. There is a possibility that the left brake is causing the wingnut to rotate undesirably, and using safety wire may help resolve this issue. The discussion emphasizes the need for clearer communication and potential mechanical adjustments to improve the braking system.
Dubskiehrye
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Homework Statement
Engineering/Physics Car (Almost Exactly Science Olympiad Scrambler)
Relevant Equations
Ug--->K
Hello a group of students and I are trying to design a car with a wingnut breaking mechanism. However instead of the wingnut hitting the washer connected to the wood and stopping the threaded rod from rotating the threaded rod and wheels actually shift left while the wingnut stays stationary, and the right wheel hitting the wood is gthe thing that actually stops the vehicle. Does anyone have a fix to this?
 
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Welcome, @Dubskiehrye !

Could you describe the braking mechanism in more detail?
Are you able to draw a basic diagram showing us the arrangement of the mentioned parts?

Perhaps the left brake is undesirably rotating the wingnut?
If so, safety wire may be a solution.
 
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