Answer :
Final answer:
The true statement about disc brakes is to measure the depth of the grooves on the rotor surface.
therefore the correct answer is d
Explanation:
Out of the given options, the true statement about disc brakes is D. To measure the depth of the grooves on the rotor surface. When disc brakes wear down, grooves can form on the surface of the rotor. It is important to measure the depth of these grooves to determine if they are within acceptable limits.
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