Posted by Vaughn [172.70.214.33] on Saturday, February 01, 2025 at 11:00:12 :
In Reply to: Brake adjustment posted by clueless [172.70.54.194] on Friday, January 31, 2025 at 14:10:15 :
This is additional guidance I follow when performing brake service.
MUST DO
Make sure hub bearings are adjusted properly, no side play in hub.
Make sure shoes are concentric to drum - centered, .006 at Heel, .012 at Toe.
Perform major brake service during warmest time of year, if possible, to avoid brakes dragging if service is performed in winter months. If service in winter months is unavoidable, perform major adjustment at room temperature, if possible, or again in summer months.
MINOR ADJUSTMENT
Turn brake cam outward (left bolt, counterclockwise, right bolt clockwise until when facing backing plate, until drum is locked, then back off till free rotation.
MAJOR ADJUSTMENT
Remove cover from inspection hole in drum. Adjust brake shoe cam so that 0.012-inch clearance exists between the brake shoe toe and the brake drum.
If the clearance between brake shoe and drum at the heel is 0.006-inch, when the clearance at the toe is adjusted to 0.012 inch, an anchor bolt adjustment is not required.
If heel clearance is not 0.006-inch, loosen anchor bolt lock nut and turn anchor bolts outwards (left bolt, counterclockwise, right bolt clockwise when facing backing plate. Move the anchor bolt gradually and at the same time watch the clearance at the toe of the shoe and keep it at 0.012-inch as the anchor bolt adjustment progresses.
When the two adjustments (0.006 in. at the heel and 0.012 in. at the toe) are obtained, the brake shoes will be properly centralized.
When the shoe has been adjusted, hold the anchor bolt from turning and securely tighten the lock nut.
INSTALLING NEW SHOES
This procedure replaces third paragraph in major adjustment. If heel clearance is not 0.006-inch, loosen anchor bolt lock nut and turn anchor bolts inward (left bolt, clockwise, right bolt counterclockwise until indentation in bolt heads align with each other when facing backing plate. Move the anchor bolt gradually and at the same time watch the clearance at the toe of the shoe and keep it at 0.012-inch as the anchor bolt adjustment progresses.
If shoes are not centered full lining contact at drum is reduced, resulting in less stopping power and overheating of drums.
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