BRAKE SYSTEM
Paragraph
Rear wheel brake 96
Front wheel brake 97
=96. REAR WHEEL BRAKE= (figs. 60, 61, and 62).
=a. Linkage.= Brake foot pedal on right side of vehicle is connected
to bell crank (located on rear footboard support rod) by means of the
front brake rod (nonadjustable). The bell crank is connected to rear
brake operating lever by means of the rear brake rod with adjustable
clevis end.
[Illustration: RA PD 310277
_Figure 60—Rear Brake Adjustment_]
=b. Adjusting Rear Wheel Brake= (fig. 60). If brake operating lever
stands ahead of vertical position, excessive lining wear is indicated.
Brake shoes must be replaced (steps =c= and =d= below). Normal free
play of brake foot pedal before brake operation is 1 inch. After brake
takes effect in vehicle operation, brake foot pedal should have 1-inch
reserve travel before bottoming on footboard. If brake foot pedal
operation does not come within these limits, adjust rear brake rod as
follows:
(1) Remove cotter pin, plain washer, and clevis pin from end of rear
brake rod clevis.
(2) Loosen clevis lock nut on brake rod.
(3) Turn clevis onto (clockwise) brake rod to shorten rod and take up
foot pedal free play.
(4) Turn clevis off (counterclockwise) brake rod to lengthen rod and
increase foot pedal free play.
(5) After making brake adjustment, spin rear wheel and make sure brake
is not dragging. When correct brake adjustment is attained, install
clevis pin in clevis and brake operating lever with plain washer, and
retain with cotter pin. NOTE: _Cotter pin must be in good condition._
[Illustration: RA PD 310273
_Figure 61—Rear Brake Assembly_]
=c. Remove Brake Shoes= (fig. 61).
(1) Remove rear wheel (par. 127).
(2) Remove brake drum and sprocket assembly. Brake shoes are now
accessible. Do not remove side cover assembly from frame.
(3) Disconnect brake rod clevis at brake operating lever.
(4) Place end of large screwdriver blade between ends of brake shoes at
pivot stud. Move brake‐operating lever forward to hold brake shoes in
fully expanded position, and pry ends of shoes off pivot stud without
removing brake shoe springs.
=d. Install Brake Shoes.= Observe that brake shoes are made for upper
and lower positions and are not interchangeable. Recess in end of shoe
for pivot stud head determines position of shoe in assembly.
(1) Engage ends of springs in shoe assembly holes from the inside
before installing shoes on side cover (fig. 61).
(2) With brake shoes and springs assembled, install so that ends of
shoes will slip over pivot stud and shaft‐operating cam.
(3) Connect brake rod clevis to brake operating lever.
(4) Install brake drum and sprocket assembly. Lock brake to hold drum
in place while installing wheel (fig. 84).
(5) Install rear wheel (par. 127). NOTE: _If rear chain is in need of
adjustment, it should be done at this time._
(6) To equalize brake shoes, loosen nut on brake shoe adjustable pivot
stud (on outside of brake side plate), and while applying pressure
on brake foot pedal (to “center” the brake shoes within the drum),
retighten the pivot stud nut.
(7) After new or relined shoes have been installed, check foot pedal
for free play (step =b= above).
=97. FRONT WHEEL BRAKE= (fig. 62).
=a. Linkage= (=control=). Handle bar hand lever control wire which
operates front wheel brake can be adjusted and or replaced. Keep brake
control wire lubricated (through oiler in housing and at ends of
housing) with engine oil.
=b. Remove Control Wire.= Remove control wire clamp nut from brake
lever clevis, and free lower end of control wire from clevis.
(1) Remove cotter pin and flat washer from hollow pin, permitting
hollow pin to be pulled out of hand lever. Control wire can now be
pulled out of housing through the hole in hand lever.
=c. Install Control Wire.= Apply grease or engine oil to
new control wire and insert, through hand lever, into control wire
housing. Use caution when inserting a new control wire into housing,
to prevent wire end from fraying. A frayed wire with loose end strands
will not feed through the housing.
(1) With control wire in housing, insert hand lever hollow pin so that
narrow slot straddles control wire: then fit flat washer over end of
hollow pin, retaining both with cotter pin.
(2) Insert lower end of control wire through clamp nut, then through
clevis and back through clamp nut again. Grasp end of wire with pliers
and pull until all slack is taken up. Then, while pulling wire snug,
tighten clamp nut securely. Cut off excess wire.
(3) Adjust brake control (refer to step =d= below).
[Illustration: RA PD 310274
_Figure 62—Front Brake Control and Adjusting Members_]
=d. Adjusting Front Wheel Brake.= End of brake hand lever must
move freely about 1/4 of its travel before meeting resistance of brake
operation.
(1) Loosen adjusting sleeve lock nut and turn adjusting sleeve as
necessary to attain correct free movement of hand lever.
(2) After correct hand lever adjustment is made, tighten adjusting
sleeve lock nut.
=e. Remove Brake Shoes.=
(1) Remove front wheel (par. 125). After front wheel is removed, brake
side cover and shoe assembly is accessible for shoe replacement.
(2) Remove brake shoes. Brake shoes and springs can be pried off pivot
stud and freed from operating cam without removing springs.
=f. Install Brake Shoes.= Observe that brake shoes are made for upper
and lower positions and are not interchangeable. Recess in end of shoe
for pivot stud head determines position of shoe in assembly.
(1) Engage ends of springs in shoe holes from the inside before
installing shoes in brake side plate.
(2) With shoes and springs assembled, install the shoes so that ends of
shoes will slip over pivot stud and shaft operating cam.
(3) Install front wheel and brake assembly (par. 125).
(4) Loosen nut on brake shoe adjustable pivot stud and while applying
pressure on brake hand lever, retighten pivot stud nut. This is to
center brake shoes within the brake drum.
(5) After new or relined shoes have been installed, check brake hand
lever and, if necessary, adjust the control wire (step =d= above).