Buick LeSabre 1965 Service Manual page 564

9 - 4 2 POWER BRAKES
BRAKES
POWER
PISTON
POWER
PISTON
RETURN
SPRING
ATMOSPHEREC
PRESSURE
AIR VALVE
RETURN SPRING
CHECK
VALVE
ATMOSPHERIC
PRESSURE
& VACUUM
VACUUM
drainage. Discard old fluid. In-
stall filler cap and diaphragm
and cover hydraulic cylinder out-
let with tape to exclude dirt.
Clean all loose dirt from outside
of unit before disassembling.
b. Installation of Power
Brake Unit
1. Place power brake unit in po-
sition. Install four nuts on studs,
and torque to 20-28 ft. lbs.
2. Install push rod eye over pedal
pin. Install special washer and
retainer.
Figure 9-38—Power Brake - Holding Position
3. Connect brake pipe to hydrau-
lic cylinder.
4. Connect vacuum h o s e to
check valve on front housing.
5. Bleed hydraulic s y s t e m ac-
cording to procedure in paragraph
9-6. Bleed left front wheel cyl-
inder first and check for proper
pedal feel. If system still has air
in it, bleed other t h r e e wheel
cylinders.
6. After bleeding, bring fluid
level to 1/8" below lip of reser-
voir opening and install reservoir
lid.
NOTE: When pressure bleeding
equipment is not available, do not
use any vacuum assist. The en-
gine should not be running and the
vacuum reserve should be used up
by repeatedly applying the brake
b e f o r e starting the b l e e d i n g
procedure.
7. Check pedal for full return and
check stop light switch adjustment
as described in paragraph 9-7 (b).
c. Testing Power Brake Unit
1. Vacuum Assist. With engine
stopped, apply brake several