Chevrolet 30 Series 1967 Service Manual page 253

Fig. 65—Pro p eller Shaft Parking Brake (Band Type)
. Install brake shoes as previously directed under
6
Brake Shoe Installation.
PARKING BRAKE-PROPELLER SHAFT
(Band Type Fig. 65)
Brake Band
Removal
1. Remove brake pull-rod clevis pin and disengage
brake pull rod.
2. Back off nuts from
spring pressure.
3. Remove nuts from lower brake band bracket adjust­
ing bolt, then remove bolt.
4. Remove bolt by pushing up on bolt until it clears
" J "
clevis pin in brake cam.
5. Cut lock wire, back off anchor adjusting screw until
clear of anchor.
. Slide band assembly off drum, removing anchor
6
screw spring as band is removed.
Inspection
1. Examine braking surface of drum for roughness or
scoring. If drum is worn or damaged, it must be
replaced as directed later.
2. Inspect brake lining. If worn down close to rivet
heads, new lining must be installed.
3. Examine tension and release springs; replace if
weak or broken.
Relining
1. Remove rivets and lining from brake band and
thoroughly clean band.
2. Rivets should be installed from center, alternately
working toward each end of band.
3. Check lining to band air gap. A .010" feeler must not
enter at any point.
Installation
1. Place band and lining assembly over brake drum.
Place anchor screw spring in depression in anchor
" J " bolt slowly because of
and compress spring as band anchor bracket is
placed over anchor.
2. Install anchor screw through bracket and spring into
anchor. Insert lower brake band bracket adjusting
bolt through band lower bracket and hole in support
and start nuts on bolt.
3. Install new clevis pin through operating cams and
link plate. Position operating cams on top of band
upper bracket with toe of cam facing forward.
4. Insert threaded end of adjusting bolt down between
operating cams. Position hook toward rear. As bolt
is lowered into place it must pass through band upper
bracket, upper release spring, brake support lower
release spring, and band lower bracket. Install
tension spring, flat washer, adjusting nut, lock
washer, and lock nut on adjusting bolt.
NOTE: On remote control parking brake, no
tension spring is used.
5. Turn up anchor screw " B " (fig. 65) until there is
.010"-.015" clearance between lining and drum.
. Draw up adjusting bolt
6
clearance between drum and lower end of band.
Tighten lock nut " D" .
7. Turn up adjusting nut " E " until there is .020"
clearance between drum and upper end of band.
Tighten lock nut " F " .
. Recheck all points of facing for correct clearances.
8
9. Set handbrake lever in the fully released position.
10. Using a new clevis pin connect brake pull rod to
operating cams. Length of rod must be adjusted
so that bottom of cams remain flat on band bracket
when rod is connected.
NOTE: On floor mounted installations, attach
cable to bottom hole. On dash mounted installa­
tions, attach cable to top hole of cam.
Brake Drum
Removal
1. Remove brake band and lining assembly as pre­
viously directed.
2. Remove nuts and lock washers from bolts attaching
propeller shaft U-joint flange and brake drum to
transmission output shaft flange. Telescope propel­
ler shaft at slip joint and lower end of propeller shaft
to floor. Remove if necessary, nuts, lock washers,
and bolts attaching propeller shaft center bearing
hanger bracket to crossmember.
3. On some vehicles, brake drum is mounted on for­
ward side of transmission output shaft flange, and
on other vehicles it is mounted on rear side of the
flange. In either case, the drum and output shaft
flange will be removed by removing the bolt or nut
on the end of the output shaft, then pulling the
assembly from the splined output shaft.
CAUTION: Do not hammer or pry drum during
removal.
4. P ress serrated bolts (if used) or remove bolts and
nuts from flange and drum assembly to separate
drum and flange.
Installation
1. Wipe clean mating surfaces of brake drum and output
shaft flange. Line up brake drum and flange and
BRAKES 5-39
until there is .020"
" C "
CHEVROLET TRUCK SERVICE M ANUAL