| 摘要 |
A brake apparatus having a friction pad riveted to a brake shoe and an air conduit recessed within the pad and positioned within its working thickness. As the pad is gradually worn away, the conduit is interrupted by the formation of an opening therein before the rotor can be scored by the rivets. A remote indicator, which may be mounted on the instrument panel of a vehicle, is then responsive to a change in air pressure within the conduit to signal the need for pad replacement.
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