Chevrolet 10 Series 1970, Руководство по обслуживанию

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BRAKES 5-8
J-22489
F ig . 14—Brake B leede r A d a p te r Tool J -2 2 4 8 9 In s ta lle d as T y p ic a l
3. R eplace a ll rubber parts of the system , including
brake hoses.
4. R e fill the system .
5. B leed the system .
Pressure Bleeding
1. Clean all d irt fro m the top of the main cylin d er and
rem o ve the c o v e r and diaphragm.
2. Reduce fluid le v e l in the main cylin der to approxim a­
te ly one half full.
3. Install the appropriate b le e d e r adapter on the main
cylin d er (fig . 14). Connect the hose fro m b leed er
equipment to b le e d e r adapter. Open the re le a s e
va lve on the equipment.
NOTE:
Brake b leed er equipment should be ca­
pable of exertin g 30 to 50 lbs. hydraulic p ressu re
on the brake system .
4. P ou r a su fficient amount of brake fluid into a trans­
parent container to ensure that the end of a b leed er
hose w ill rem ain subm erged during bleeding. P la c e
one end of the b le e d e r hose into the container,
(fig . 16)
5. If the main cylin d er has b le e d e r v a lv e s , slip the
loose end o f the b le e d e r hose o v e r the va lve and
using a b le e d e r wrench such as J-21472 open the
va lve 3/4 of a turn. When fluid flow s without bubbles,
close the va lve tightly.
6. The sequence o f bleeding is to bleed the cylin d er
next in line (distance) fro m the main cylin d er until
a ll cylin d ers have been purged of a ir.
7. If the veh icle is equipped with a fra m e mounted
b ooster the b o oster should be bled a fte r the main
cylin der.
NOTE:
On ve h ic le s with upper and lo w e r wheel
cylin d ers on the same wheel always bleed the
lo w e r cylin d er firs t.
8. A fte r the en tire system has been purged o f a ir, close
the va lve on the b leed er equipment and rem ove the
b leed er adapter.
NOTE:
When rem ovin g the b le e d e r equipment,
place a clean cloth below the main cylin d er to
absorb any fluid sp illa ge as the adapter is r e ­
m oved. W ipe a ll areas d ry if fluid was sp illed
as brake fluid w ill cause paint distortion.
9. F ill main cylin d er r e s e r v o ir as shown in F igu re 15.
10. Install main cylin d er diaphragm and c o v e r.
CA U TIO N :
DO N O T MOVE THE V E H IC L E UN­
T IL A F IR M P E D A L IS O B T A IN E D .
M a n u a l Bleeding
Manual bleeding is s im ila r to p ressu re bleeding except
that the brake fluid is fo rc e d through the lin es by pump­
ing the brake pedal.
1. Clean a ll d irt fro m the main cylin d er and rem ove the
c o v e r and diaphragm.
2. F ill the main cylin d er r e s e r v o ir and rep lace the
c o v e r.
3. Pour a sufficien t amount o f brake fluid into a tran s­
parent container to ensure that the end of a b leed er
hose w ill rem ain subm erged during bleeding. P lace
one end o f the hose into the container (fig . 16).
F ig . 15—C o rre c t M a in C y lin d e r F lu id Level
CHEVROLET TRUCK SERVICE MANUAL