BENDIX BW7255 User Manual

17

Dragging brakes

See DRAGGING BRAKES

Poor lining-to-drum contact. Linings are tapered
across width:
• Bell-mouthed drum

 Replace drum (3)

• Bent brake spider

 Replace spider (3,6)

•  Bent or stretched brake shoe

 Replace shoe (3,6)

• Loose wheel bearing

 Torque spindle nuts and check end play (6)

• Worn or damaged cam

 Replace cam (3,6)

Shoe-to-shoe variation:
• Mismatched lining friction codes

 Replace lining(s) with proper friction code (5)

• Stretched shoe

 Replace shoe (3,6)

Brake components:
• Flat spots on cam or roller

 Replace cam or roller (3,6)

• Worn anchor pin

 Replace anchor pin (3,6)

• Worn camshaft or bushings

 Replace camshaft and bushings (5)

Unequal wear on side-to-side brakes for same axle:
• Mismatched lining friction codes

 Replace lining(s) with proper friction code (5)

• Seized or binding camshaft

 Clean and lubricate camshaft (2)

• Brake drum surface in poor condition

 Replace drum (3)

• Loose wheel bearing

 Torque spindle nuts and check end play (6)

• Performing downgrade braking using light drag

 Use snub method on downgrades

 Slack adjuster not set properly:
• Incorrect installation of slack adjuster

 Install slack adjuster properly (3,6)

• Incorrect in-service adjustment

 Check and correct adjustment procedure (2)

• Incorrect setup of external reference control arms

 Perform correct setup procedure (2)

(Eaton-Haldex)

• Broken or bent parts

 Replace damaged parts as required (3,6)

Wear on edge of lining:
• Wrong lining width

 Replace lining (5)

• Wrong drum

 Replace drum (3)

• Loose bearing adjustment. Bearing spacer missing or too thin

 Replace spacer and torque spindle nuts. Check end

play (6)