Bendix Commercial Vehicle Systems ES User Manual

Bendix

Extended Service Brake Lining Wear Gauge

For use with Bendix extended service air actuated drum brakes where minimum allowable lining thickness is 1/4 in. (Note: Do not use for strip linings on 15 x 4 brakes or similar brakes.)

Instructions for Minimum Lining Thickness

1. With the brake not applied, place the tip of the gauge labeled minimum lining

thickness between the two lining blocks, between the top of the shoe table and drum. Use the gauge to scrape away any mud, rust, or other contaminants that could interfere with proper lining measurement.

2. Remove the gauge from the brake.

3. With the vehicle’s brakes applied, try to put the minimum lining thickness end

of gauge between the two lining blocks and the top of the shoe table. Note “hook” of gauge allows insertion around worn drum lip. If the tip of the gauge will not ﬁ t between the brake drum and the top of the shoe table, the lining is worn below the minimum thickness and needs to be replaced.

4. If the tip of the gauge ﬁ ts between the brake drum and the shoe table, the

lining is not worn below the minimum thickness at this time.

5. Because brake shoes can wear at different rates, check both shoes on each

brake and all brakes on the vehicle.

Instructions for 50% Wearable Lining Thickness

1. With the brake not applied, place the tip of the gauge labeled 50% wearable

lining thickness between the two lining blocks, between the top of the shoe table and drum. Use the gauge to scrape away any mud, rust, or other contaminants that could interfere with proper lining measurement.

2. Remove the gauge from the brake.

3. With the vehicle’s brakes applied, try to put the 50% wearable lining thickness

end of gauge between the two lining blocks and the top of the shoe table. Note “hook” of gauge allows insertion around worn drum lip. If the tip of the gauge will not ﬁ t between the brake drum and the top of the shoe table, the lining has less than 50% wearable lining thickness remaining.

4. If the tip of the gauge ﬁ ts between the brake drum and the shoe table, the

lining has more than 50% wearable lining thickness remaining.

5. Because brake shoes can wear at different rates, check both shoes on each

brake and all brakes on the vehicle.