Chevrolet 10 Series 1970 Service Manual page 271

F ig . 59—C h e c k in g W heel C y lin d e r Piston F it
equipped with spring assem b lies consisting of a spring
between two lip expanders.
Inspection
R ep air kits are available which ontain the parts to be
replaced when overhauling wheel cylin ders.
1. Inspect cylin d er b ore
co rro sio n . Ligh t scratch es
spots may be polished out with crocus cloth. N e v e r
use em ery cloth o r sandpaper. If scratches o r c o r ­
rosion are too deep to be polished out, replace
cylin der.
2. Check fit o f new pistons in cylin d er bore, using a
fe e le r gauge. C learance should be within 0.002" to
0.004". R eplace cylin d er if clearan ce exceeds 0.004".
Assembly
B e fo re assem bling wheel cylin d er, be sure each part
has been cleaned in denatured alcohol.
PA10
fo r s c o re s , scratch es, o r
o r sligh tly corrod ed
CA-KA10-20, CA30
F ig . 6 1 —P arking Brake Levers C - K - P
CA-KA-PA10, CA-KA-P
CA-PA30 CA-PA40,
C D -C G -M A 50-60
F ig . 6 0 —Brake Pedal C - K - P - M - S and T M o dels
CAUTION:
Do_ not use kerosene o r gasoline fo r
cleaning wheel cylin d er parts. Dip each internal
part in hydraulic brake fluid b efo re assem bling.
Duo-Servo Type (Fig. 57 )
1. Pla ce pistons, cups and spring o r sprin g assem bly
in cylin d er with parts positioned as shown.
2. A ssem ble boots and push rods, then in sta ll boots
o v e r ends o f cylin d ers.
Tw inplex Type
1. P la ce pistons, cups, spring and expander assem bly
in cylin der.
2. A ssem b le boots on push rods, being sure bead on
boot engages gro o ve in push rod. Install boots and
push rods on cylin der, engaging bead on outer edges
o f cylin d er housing.
1 0 -2 0 -3 0 M o dels
BRAKES 5-33
FLAT
C OW LS
PA 20-30
CHEVROLET TRUCK SERVICE MANUAL