Checking front brake discs wear assessment

Includes:

1. Visual inspection for cracks and crack

2. Checking brake discs for mimimum

General

Two criteria may dictate replacement of drilled (perforated) brake discs:

1. Advanced stage of cracking in drilled (perforated) friction disc.

2. Disc thickness is below minimum due to wear (material abrasion caused by friction).

Both types of disc wear usually occur in service. Normally, brake discs will have to be replaced if the brake disc thickness is below minimum.

Only in rare cases (if brakes are subjected to racing-like loads for longer periods or if the friction surface is exposed to heavy temperature fluctuations) will perforation cracks progress far enough to require premature disc replacement.

Both condition criteria are described separately in the following sections.

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