Answer :
Final answer:
The vise-grip of a dial-indicator should be attached to a non-moving part of a braked trailer, such as the axle or hub, to ensure accurate measurement of rotor or drum runout without being affected by suspension movement.
Explanation:
When using a dial-indicator on braked trailers, it is essential to clamp the vise-grip securely to avoid any movement that could lead to inaccurate readings. Typically, the vise-grip of the dial-indicator should be attached to a non-moving part of the trailer, often on the axle or hub, which is not subject to the suspension movements. The placement should allow the dial-indicator tip to rest on the rotor or the drum, depending on the type of brake system. This ensures that the dial-indicator can accurately measure the amount of runout or other deformation on the rotor or the brake drum when it is rotated. It is crucial that the attachment point is solid and that it does not shift during the measurement process.
