Manual Bleeding - Chevrolet CHEVY VAN G10 SERIES Service Manual

1. Clean all dirt from to p o f m aster cylinder and remove
cylinder cover and rubber diaphragm .
N O T E : Make sure brake flu id in bleeder equip­
m ent is at operating level and th at the equipment is
capable o f exerting 20 to 30 lbs. hydraulic pressure
on the brake system.
2. Install Brake Bleeder
cylinder. C onnect hose
bleeder adapter and
equipm ent.
N O T E : The com bination valve, located near the
master cylinder, must be held in the open position
while bleeding. This can be accomplished by in­
stalling Tool J-2 37 09 w ith the open slot under the
mounting bolt and pushing in on the pin in the end
o f the valve (Fig. 6 ). Be sure to re-torque the
mounting bolt after removing Tool J-23709.
3. Install Brake Bleeder Wrench J-21472 on bleeder valve at
wheel cylinder nearest the m aster cylinder, and install
one end o f bleeder hose on bleeder valve (Fig. 7).
N O T E : If the master cylinder is equipped with
bleeder valves, bleed these valves first, proceed to
the wheel cylinder nearest the master cylinder, then
the next nearest and so on until all cylinders have
been bled and there is no evidence of air in the
system.
4. Pour a sufficient am oun t o f brake fluid into a transparent
container to ensure th a t end o f bleeder hose will rem ain
subm erged during bleeding. Place the loose end o f
bleeder hose in to the container. Be sure the hose end is
subm erged in the fluid.
5. O pen wheel cylinder bleeder valve by turning Tool
J-21472 counter-clockw ise approxim ately 3 /4 o f a turn
and observe flow o f fluid at end o f bleeder hose.
N O T E : T o assist the bleeding operation, a rawhide
mallet may be used to tap the caliper while fluid is
flowing.
6
. Close bleeder valve tight as soon as bubbles stop and
brake fluid flows in a solid stream from the bleeder hose.
7. Remove brake bleeder w rench and bleeder hose from
wheel cylinder bleeder valve.
8
. R epeat Steps 3 through 7 on the remaining wheel
cylinders.
9. D isconnect bleeder equipm ent
adapter.
10. Remove bleeder adapter. Wipe all areas dry if fluid was
spilled during adapter removal.
11. Fill m aster cylinder reservoirs to w ithin 1/4" o f reservoir
rim s as shown in Figure
12. Install m aster cylinder diaphragm and cover.
13. Test operation o f brakes before moving the vehicle.
A dapter J-23518 on m aster
from bleeder equipm ent to
open release valve on bleeder
from brake bleeder
8
.
M ANUAL BLEEDING
1. Clean all dirt from the top o f the m aster cylinder and
remove the cylinder cover and rubber diaphragm .
2. Fill m aster cylinder (if necessary) and reinstall the cover.
3. Install Brake Bleeder Wrench J-21472 on a bleeder valve
at a wheel cylinder and install a bleeder hose on the
bleeder valve (Fig. 7).
N O T E : If the master cylinder is equipped with
bleeder valves, bleed these valves first, proceed to
the wheel cylinder nearest the master cylinder, then
the next nearest and so on until all cylinders have
been bled and there is no evidence of air.
The com bination valve, located near the m aster cylin­
der, m ust be held in the open position while bleeding.
This can be accom plished by installing Tool J-23709
with the open slot under the m ounting bolt and pushing
in on the pin in the end of the valve (Fig.
to re-torque the m ounting bolt after rem oving Tool
J-23709.
4. P our a sufficient am ount of brake fluid into a tran s­
parent container to ensure th at the end of the bleeder
hose will rem ain subm erged during bleeding. Place the
loose end of the bleeder hose into the container.
N O T E : Carefully m onitor the fluid level at the
master cylinder during
enough flu id at one tim e to drain the reservoir.
Replenish as needed to ensure a sufficient am ount
of fluid is in the master cylinder at all times.
5. O pen wheel cylinder bleeder valve by turning Tool
J-21472 counter-clockw ise approxim ately 3 /4 o f a turn.
Have helper depress the brake pedal. Ju st before the
brake pedal reaches th e end o f its travel, close the bleeder
valve and allow the brake pedal to retu rn slowly to the
released position. R epeat S tep 5 un til expelled brake
fluid flows in a solid stream w ith o u t the presence o f air
bubbles, then close the bleeder valve tight.
BRAKES 5-5
6
) . Be sure
bleeding. Do not bleed
C H E V Y V A N SH O P M A N U A L