4-57. SERVICE BRAKE MAINTENANCE (SINGLE WHEEL CYLINDER) (Con't).
If present, remove peened ends from two pins (3). Remove two cams (5), springs (8), and pins from backing
Remove recessed washer (22) and spring (23) from each guide pin (6). Remove two nuts (29), Iockwashers (28),
and guide pins from backing plate (4). Discard Iockwashers.
Remove two nuts (26), Iockwashers (25), and anchor pins (19) from backing plate (4) and anchor pin bracket
(24). Discard Iockwashers.
If damaged, remove four rivets (27) and anchor pin bracket (24) from backing plate (4). Discard rivets.
CLEANING AND INSPECTION
DC) NOT handle brakeshoes, brakedrums, or other brake components Unless area
has been properly cleaned. There maybe asbestos dust on these components which
can be dangerous If you touch it or breathe it. Wear an approved filter mask and
gloves. Never use compressed air or a dry brush to clean brake components. Dust
may be removed using an industrial-type vacuum cieaner. Ciean dust or mud away
from brake components with water and a wet, soft brush or cloth. Failure to follow
this warning may result in serious illness or death to personnel.
. Dry cleaning solvent, P-D-680, is toxic and fiammable. Always wear protective
goggles and gloves, and use only in a we!i-ventilated area, Avoid contact with skin,
eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open frame or
excessive heat. The solvent's flash point is 100F-138F (38C-59C). if you
become dizzy while using cleaning solvent, immediately get fresh air and medical
help. if solvent contacts eyes, Immediately wash your eyes and get medical aid.
Clean all parts with dry cleaning solvent and dry thoroughly.
inspect ail parts for cracks, breaks, corrosion, or other damage. Replace all damaged parts.
inspect brakeshoe linino (21) for cracks, distortion, and excessive wear. Replace brakeshoes if damaged or
Measure depth of rivets (20) below brakeshoe lining (21), Replace brakeshoe if depth of rivets is not at least
3/32 in. (2.38 mm) below brakeshoe lining.
inspect braking surface for grease or hydraulic fluid, If grease or hydraulic fluid is present, replace brakeshoes.
If replacing brakeshoes only, perform steps 8 through 11.
if removed, install anchor pin bracket (24) on backing plate (4) with four new rivets (27).
install two anchor pins (19) in backing plate (4) and anchor pin bracket (24) with two new Iockwashers (25) and
Install two guide pins (6) in backing plate (4) with two new lockwashers (28) and nuts (29). Torque nuts to
25 Ib.-ft. (34 Nom). install spring (23) and recessed washer (22) on each guide pin.