Power Brake; Air Filter - Pontiac Grand Prix Service Manual

5A-4 1969
PONTIAC SERVICE MANUAL
Fig.
5A-4
Removing Front Housing
AIR FILTER
CAUTION: Do not clamp on hub as outside surface
serves as bearing and sealing surface. Replace air filter elements if d * .
Do not clean.
1 1. Remove snap ring on air valve using Truarc Pliers
ASSEMBLE BRAKE UNIT
and place power piston with tube end down in arbor
press.
MASTER CYLINDER
-
ASSEMBLE
12. Press air valve from power piston hub using rod
not exceeding 1/2" diameter. Removal of valve
releases floating control valve, floating valve retainer,
push rod limiter washer and air filter materials (Fig.
5A-12).
NOTE: On Pontiac models, the floating control valve
cannot be removed fiom push rod. It will be necessary to
service complete push rod air valve assembly.
13. Remove O-ring seal from the air valve in second
groove from air valve operating rod end.
14. Remove power piston bearing from rear housing.
MASTER CY LlN DER
-
DISASSEMBLE (Fig. 5A- 13)
Refer to Section 5
-
Standard Brakes for disassembly
procedures.
INSPECTION AND CLEANING
Thoroughly wash all parts in alcohol and air dry. Blow
Refer to ~e*on 5
-
Standard Brakes for assembly
procedures.
POWER PISTON -ASSEMBLE
1. Place a new O-ring seal in groove on hydraulic
cylinder push rod. Wipe thin coat of power brake
lubricant on O-ring.
2. Insert hydraulic cylinder push rod through reaction
retainer
so
that end of rod with small pilot protrudes
from flat side of reaction retainer.
3. Place power piston installer, J 21524, in vise and
position power piston with three lugs fitting into
notches
in
piston.
4. Install new O-ring seal on air valve in second groove
from valve operating rod end.
NOTE: On Pontiac modek, a new air valve assembly
must be installed since floating control valve
is
a