Chevrolet 1980 Light Duty Truck Repair Manual page 150

5-14 BRAKES
LOCK RING
F ig . 5 - 4 C - - R e m o v in g L o c k R in g F r o m P o w e r P is to n
brake unit. Lubricate rubber parts with D elco approved
lubricant or equivalent.
Front Housing Group Assem bly
1. Install a new vacuum check valve using a new
grom m et lubricated with
equivalent.
2. Place new front housing seal in housing so flat
surface o f cup lies against bottom o f depression in housing.
POW ER PISTO
Fig. 5-5C--Removing Reaction Retainer
power brake lubricant or
REACTION
RETAINER
REACTION
LEVERS
REACTION
PLATE
4
F ig . 5 - 6 C - - P o s it io n in g S u p p o r t P la te R e t a in e r in V is e
P o w er Piston Group A ssem bly
1. Place new "O" ring in groove on the m aster cylinder
piston rod. W ipe a thin film o f Pow er Brake Lube or
equivalent on "O" ring.
2. M aster cylinder piston rod is now inserted through
the reaction retainer so round end o f piston rod protrudes
from end o f the tube on reaction retainer.
3. Place J-21524 power piston wrench in a vise.
Position power piston on wrench w ith three lugs fitting into
notches in power piston.
F ig . 5 - 7 C ~ P o s i t io n i n g P o w e r P is to n o n S u p p o r t P la t e
R e m o v e r