A brake pad is the block that presses against the wheel to slow it. Replace the brake pad.
It is meant to wear out, since it is cheaper than the rim or disc it protects. A brake pad worn to the metal costs far more than the pad ever would.
1nounbrake padThe block that presses against the wheel to slow it.
“The brake pad had worn through to the backing.”
brake pad is a part.
Practised in Cycling