Chevrolet 1977 Monte Carlo, Руководство по ремонту

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BRAKES 5-3
straight out. A considerable force will be required.
14. R em oval o f the air valve push rod assem bly w ill
disassem bly the control valve retainer.
15. R em ove the "O" ring from the air valve.
16. A ir valve push rod assem blies with a formed eye
on the end o f the push rod w ill be serviced using a com plete
assembly, since the floating control valve cannot be removed
over the eye end o f the push rod.
C leaning
A fter disassembly, im m erse all m etal parts in
denatured alcohol. Plastic parts, as well as the rubber power
diaphragm s, should be cleaned in denatured alcohol or clean
brake fluid. Care should be taken to avoid chipping or
d am aging plastic parts in handling. U se air to blow out dirt
and cleaning solvent from recesses and internal passages.
Inspection of Rubber P arts
W ipe fluid from the rubber parts and carefully inspect
each rubber part for cuts, nicks or other damage. These
parts are the key to the control o f fluid or air flow. If there
is any question as to the serviceability o f rubber parts,
R E P L A C E them.
Inspecting M e ta l P arts
B A D L Y D A M A G E D IT EM S, O R T H O SE W H IC H
W O U L D T A K E E X T E N S IV E W O R K O R T IM E TO
R E P A IR , S H O U L D BE R E P L A C E D . In case o f doubt,
install new parts.
A ssem bly
Be careful during the rebuild procedure that no grease
or m ineral oil com es in contact w ith the rubber parts o f the
pow er brake unit.
Lubricate power unit parts, as outlined below, with
pow er brake silicone lubricant. T his lubricant is provided
in the service repair kit.
Front Housing Group Assembly.
1. Insert the N E W grom m et in the front housing.
2. Install the N E W vacuum check valve into the
grom m et.
Power Piston Group (Fig. 5-2A)
1. Lubricate the "O" ring seal w ith silicone lubricant
and place on the air valve.
2. W ipe a thin film o f silicone lubricant on the large
and sm all O .D . o f the floaing control valve.
3. If the floating control valve needs replacement,
replace the com plete air valve push rod assembly.
4. Place the air valve end o f the air valve push rod
assem bly into the tube o f the power piston. M anually press
the air valve push rod assem bly so that the floating control
valve b ottom s on the tube section o f the power piston.
5. Place lip o f retainer on the O .D . o f T ool J-23175 (fig.
5-3A ). M anually press the retainer until seated in the power
piston tube (fig. 5-4A ).
6. Install filter elem ent over the push rod eye and press
into the power piston tube.
7. U sin g snap ring pliers, place the snap ring into the
groove in the air valve.
8. Install the rubber reaction bum per on the end o f the
air valve.
F ig . 5 - 3 A - - l n s t a l l i n g A ir V a l v e P u s h R o d R e t a in e r
9. Install air valve spring on end o f air valve.
10. Install reaction body with large I.D . hole up.
11. Install reaction body retainer.
12. Install reaction piston into reaction body, large
diam eter up.
13. A pply a light film o f silicone lubricant to the O .D .
o f the rubber reaction disc.
14. Place the rubber reaction disc in the cavity o f the
reaction body.
F ig . 5 - 4 A ~ S e a t i n g A ir V a l v e P u s h R o d R e t a in e r U s in g
J -2 3 1 7 5
O V E R H A U L M A N U A L