Chevrolet 10 Series 1970 Service Manual page 240

BRAKES 5-2
M AN 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, two-
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 "
has two iden tical brake shoes mounted on the backing
plate so that th eir toes
sin gle-en d wheel cylin d ers
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 all C h evrolet 17,000#
and 30,000# tandem equipped Eaton R ear A x le s .
brake is equipped with tw o-double-end wheel cylin d ers
which apply hydraulic p ressu re to both the toe and heel of
two iden tical s e lf-c e n te rin g shoes. The shoes anchor at
F ig . 1—M a in C y lin d e rs —A l I M odels
and the " F R - 3 " . The " F "
are diagonally opposite. Tw o
are arranged so that each
Each
SECONDARY SHOE
OVERRIDE
SPRING
ACTUATING LEVER
STAR WHEEL
F ig . 2 —S e lf A d ju s tin g Brake
ANCHOR PIN
PULL BACK
SPRINGS
HOLD DOW N
SPRING A N D PIN
CHEVROLET TRUCK SERVICE MANUAL