What should be checked for correct alignment with the slack adjustor?

The alignment of the pushrod of the brake chamber is crucial for the proper functioning of the slack adjustor system. The slack adjustor plays an essential role in maintaining the correct brake application by automatically adjusting the rod length as brake shoes wear down. If the pushrod is misaligned or improperly set, it can lead to ineffective braking performance, increased wear on brake components, and potential safety hazards.

Ensuring that the pushrod is aligned correctly guarantees that the slack adjustor can function as intended, allowing for the appropriate transfer of force from the brake chamber to the brake shoes. This alignment is critical for ensuring that the brakes engage fully and evenly, which is vital for safe vehicle operation.

The other options, while important in their own contexts, do not directly relate to the specific alignment requirements of the slack adjustor. Brake pads and brake fluid level, for example, are more about brake performance and maintenance rather than the specific alignment of the slack adjustor's components. Similarly, brake light wiring pertains to the electrical signaling system rather than mechanical alignment issues.