Final answer:
The correct answer is c) Both A and B.Mechanic A is correct in suggesting that it is acceptable to adjust a manual slack adjuster back to specifications, while Mechanic B is right in saying that automatic slack adjusters should not be re-adjusted.
Step-by-step explanation:
When it comes to a DOT inspection where a highway tractor with air brakes has a brake stroke over the allowable limit, it's important to consider the types of slack adjusters. Mechanic A believes it is acceptable to re-adjust the manual slack adjuster to specification. This is indeed a standard practice as long as the adjuster is not defective and other components of the brake system are in good condition. On the other hand, Mechanic B suggests that it is not acceptable to re-adjust the automatic slack adjuster since these are designed to maintain the correct brake stroke automatically.
If an automatic slack adjuster is out of adjustment, this typically indicates a problem with the adjuster or other brake components that simply readjusting will not fix. In such a case, it would necessitate a proper diagnosis and repair, as repeatedly re-adjusting an automatic slack adjuster can lead to further issues and is not recommended by manufacturers. Therefore, the correct answer is c) Both A and B, both mechanics are correct in their respective contexts.