Brake Drum Measurement

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Brake drum measurement.

This requires a good eye and also some experience. Drum type see page 3 5. The maximum diameter of a brake drum is listed 11. Brake pads sit between the brake shoe and the brake drum and they are crucial to the brake system of a vehicle brake thickness also plays an essential role in engine s proper operation and also for road safety.

Brake drums are cast iron or iron lined aluminum. 11 990 2c 12 030 2. It is not recommended to strike the outer area of the drum where the shoes ride. Wheel or hub number 2.

The maximum diameter of a brake drum is listed as 12 030 inches. Also a cast iron drum should ring like a bell when struck. Lave ample space at the top like in the diagram and use a measuring tape to see if the brake band wraps nicely around a 4 3 16 4 3 4 or a 6 inch drum brake. What size cut can be made before the drum must be discarded.

Dust shield recess diameter if applicable j. Brake drum and rotor measuring kit w caliper. The drums do wear however and can only get to a certain measurement called discard in order to remain effective. Actual brake drum dimensions see figure below a.

However it can be even more or less depending on the car s make and model driving habit and road conditions. More buying choices 78 60 17 new offers 150mm 6 digital brake disc drum caliper gauge digital micrometer. The normal lifespan of brake pads is between 30 000 35 000 miles. 3 7 out of 5 stars 17.

Inside finished diameter b. M measurement of drum c cut measurement d discard value as determined by manufacturer specifications 1. Manufacturer s brake drum number 4. If you need new drums have a professional install them for you because the brake shoes must be adjusted to fit.

Overall diameter of drum i. 5 0 out of 5 stars 1. Transcript brake drums have a wear limit which is the maximum inside diameter the brake drum is allowed to be. Information required for drums not listed in this catalog.

Make and number of axle 3. Look at the rest of your brakes which are still attached to the brake backing plate. If the drums aren t worn past legal tolerances 0 060 of an inch they can be reground or turned rather than replaced. The drum measures 11 990 inches.

Brake drum inspection and measurements.