Brake Drum Measurement

Transcript brake drums have a wear limit which is the maximum inside diameter the brake drum is allowed to be.

Brake drum measurement.

M measurement of drum c cut measurement d discard value as determined by manufacturer specifications 1. If you need new drums have a professional install them for you because the brake shoes must be adjusted to fit. Inside finished diameter b. Wheel or hub number 2.

The drum measures 11 990 inches. The normal lifespan of brake pads is between 30 000 35 000 miles. Also a cast iron drum should ring like a bell when struck. The drums do wear however and can only get to a certain measurement called discard in order to remain effective.

If the drums aren t worn past legal tolerances 0 060 of an inch they can be reground or turned rather than replaced. This requires a good eye and also some experience. 5 0 out of 5 stars 1. Dust shield recess diameter if applicable j.

Only 9 left in stock order soon. Actual brake drum dimensions see figure below a. The cast iron inner linings are harder and more brittle than the area around the hub and lug holes. More buying choices 78 60 17 new offers 150mm 6 digital brake disc drum caliper gauge digital micrometer.

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. 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. Make and number of axle 3.

Drum type see page 3 5. However it can be even more or less depending on the car s make and model driving habit and road conditions. It is not recommended to strike the outer area of the drum where the shoes ride. What size cut can be made before the drum must be discarded.

The maximum diameter of a brake drum is listed 11. Brake drums are cast iron or iron lined aluminum. Overall diameter of drum i. Manufacturer s brake drum number 4.

Brake drum and rotor measuring kit w caliper. Look at the rest of your brakes which are still attached to the brake backing plate. 3 7 out of 5 stars 17. Brake drum inspection and measurements.

11 990 2c 12 030 2.