Brake Drum Measurement

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.

Brake drum measurement.

Look at the rest of your brakes which are still attached to the brake backing plate. The normal lifespan of brake pads is between 30 000 35 000 miles. 11 990 2c 12 030 2. 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.

Inside finished diameter b. Dust shield recess diameter if applicable j. The drums do wear however and can only get to a certain measurement called discard in order to remain effective. Brake drum inspection and measurements.

The cast iron inner linings are harder and more brittle than the area around the hub and lug holes. If the drums aren t worn past legal tolerances 0 060 of an inch they can be reground or turned rather than replaced. Actual brake drum dimensions see figure below a. M measurement of drum c cut measurement d discard value as determined by manufacturer specifications 1.

What size cut can be made before the drum must be discarded. 3 7 out of 5 stars 17. 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. 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 drum and rotor measuring kit w caliper. If you need new drums have a professional install them for you because the brake shoes must be adjusted to fit. Drum type see page 3 5. Make and number of axle 3.

However it can be even more or less depending on the car s make and model driving habit and road conditions. Also a cast iron drum should ring like a bell when struck. The maximum diameter of a brake drum is listed 11. Manufacturer s brake drum number 4.

Overall diameter of drum i. The drum measures 11 990 inches. Only 9 left in stock order soon. The maximum diameter of a brake drum is listed as 12 030 inches.

Brake drums are cast iron or iron lined aluminum. It is not recommended to strike the outer area of the drum where the shoes ride. 5 0 out of 5 stars 1. Information required for drums not listed in this catalog.

More buying choices 78 60 17 new offers 150mm 6 digital brake disc drum caliper gauge digital micrometer.