Brake Drum Measurement

Brake drums are cast iron or iron lined aluminum.

Brake drum measurement.

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. Information required for drums not listed in this catalog. Brake drum inspection and measurements. Also a cast iron drum should ring like a bell when struck.

Only 9 left in stock order soon. The maximum diameter of a brake drum is listed as 12 030 inches. Inside finished diameter b. The drums do wear however and can only get to a certain measurement called discard in order to remain effective.

M measurement of drum c cut measurement d discard value as determined by manufacturer specifications 1. Actual brake drum dimensions see figure below a. Brake drum and rotor measuring kit w caliper. If the drums aren t worn past legal tolerances 0 060 of an inch they can be reground or turned rather than replaced.

Manufacturer s brake drum number 4. Look at the rest of your brakes which are still attached to the brake backing plate. More buying choices 78 60 17 new offers 150mm 6 digital brake disc drum caliper gauge digital micrometer. The maximum diameter of a brake drum is listed 11.

However it can be even more or less depending on the car s make and model driving habit and road conditions. Overall diameter of drum i. It is not recommended to strike the outer area of the drum where the shoes ride. Transcript brake drums have a wear limit which is the maximum inside diameter the brake drum is allowed to be.

The cast iron inner linings are harder and more brittle than the area around the hub and lug holes. If you need new drums have a professional install them for you because the brake shoes must be adjusted to fit. What size cut can be made before the drum must be discarded. The normal lifespan of brake pads is between 30 000 35 000 miles.

This number is often cast on the outside of the drum it s allowed to be 422 1 millimeters or sixteen point six two inches. Wheel or hub number 2. An over sized or thin drum will compromise the effective braking power of the drum brakes and can also be dangerous if the drum disintegrates. 5 0 out of 5 stars 1.

Drum type see page 3 5. This requires a good eye and also some experience. Make and number of axle 3. 3 7 out of 5 stars 17.

The drum measures 11 990 inches.