What should be done if a newly installed bearing race is loose and spins in the hub?

When a newly installed bearing race is loose and spins in the hub, the most appropriate action is to replace the hub. This is because a loose bearing race indicates that the raceway has likely been damaged, either by improper installation or wear that has compromised its fit within the hub. Continuing to use a hub with a loose race can lead to additional issues, such as premature bearing wear, failure of the hub assembly, and unsafe driving conditions.

Using adhesive to hold the race in place may seem like a quick fix, but it does not address the underlying issue of fit and stability, thus it is not a reliable or safe solution. Tightening the race with a hammer can cause further damage, compromising the integrity of both the race and the hub. Leaving the race as it is would also be unsafe, as it could lead to complete bearing failure during operation, resulting in possible accidents or further damage to other components.

Therefore, replacing the hub ensures that the bearing race is properly secured and will operate effectively within the vehicle's braking system.