How to Measure Drum Brakes Remove the drum from the wheel employing a drum puller if necessary. Inspect the outer facing of the rotor and locate the stamped maximum diameter or machine-to diameter in the cast. Place the drum face down onto a flat surface so the interior diameter of the drum is facing upward. Click to see full answer. Beside this, how do you measure drum brakes out of round?Always measure the inside of the brake drum before deciding to discard or machine on a lathe. Use a drum micrometer or an equivalent tool to retrieve these measurements. Compare them to the diameter stamped on the outside of the drum. If the drum is scored or grooved, place the tool into the deepest part of the groove.Secondly, what is the maximum allowable brake drum diameter? NOTE: WHEN CHECKING BRAKE DRUM DIAMETER FOR WEAR, THE DIAMETER SHOULD NOT EXCEED . 120″ OVER THE ORIGINAL DIAMETER. WHEN REBORING BRAKE DRUMS, THE FINISHED DIAMETER SHOULD NOT EXCEED . 080″ OVER THE ORIGINAL DIAMETER. Keeping this in view, how do I know what size brake shoes I need? Measure each by placing the flat base of the tire tread depth gauge onto the brake lining and then pushing down on the sliding ruler. Compare the measurements of each rivet in 1/32 inches to determine even or uneven brake shoe wear. For bonded shoe measurements, use a brake lining gauge.How do you know when drum brakes need replacing? Technical Bulletins Inconsistent brake pedal feel. If the rear brakes are drum brakes, the driver may feel vibrations under braking. Hand brake feels loose. If the hand brake requires a hard yank to keep the car from rolling off, chances are the brake shoes need replacing. Scraping noise while braking.
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