Chevrolet 10 Series 1970, Service Manual

Page: 240 / 671

BRAKES 5-2
F ig . 1—M a in C y lin d e rs —A l I M o dels
M A N U A LLY ADJUSTED BRAKES (W A G N E R )
(Fig. 4 and 5)
NOTE: A ll 60 s e r ie s m odels except Flat Face
Cowl m odels a re equipped with W agner, tw o-
cylin d er, manually adjusted brakes, fron t and
re a r.
The W agner manually adjusted brakes a re o f two d if­
fe re n t types: the Type “ F ” and the " F R - 3 ” . The " F ”
has two iden tical brake shoes mounted on the backing
plate so that th eir toes are diagonally opposite. Tw o
sin gle-en d wheel cylin d ers are arranged so that each
cylin d er is mounted between the toe of one shoe, and the
h eel of the other. The tw o -w h eel cylin d er pistons apply
an equal amount of fo r c e to the toe of each shoe. Each
cylin d er casting is shaped to p ro vid e an anchor block fo r
the brake shoe heel.
The “ F R -3 ” brake is used on a ll C h evrolet 17,000#
and 30,000# tandem equipped Eaton R ea r A x le s . Each
brake is equipped with tw o-double-end w heel cylin d ers
which apply hydraulic p ressu re to both the toe and heel of
two id en tical s e lf-c e n te rin g shoes. The shoes anchor at
F ig . 2 —S e lf A d ju s tin g Brake
STAR WHEEL
SECONDARY SHOE
ANCHOR PIN
PULL BACK
SPRINGS
OVERRIDE
SPRING
ACTU ATING LEVER
HOLD D O W N
SPRING A N D PIN
CHEVROLET TRUCK SERVICE MANUAL