Exploded View Of Typical Power Brake Unit - Mazda 1983 RX7 Service Manual

3) Attach suitable tool to rear shell mounting studs. Press
down on tool while rotating it clockwise to unlock rear shell.
4) Lift rear shell assembly from power unit, remove air
silencer retainer, and separate diaphragm from power piston assembly.
Remove valve rod with plunger assembly from rear shell.
5) Remove lock plate and press the valve rod in to remove
the valve retainer key. Remove valve rod and plunger assembly. Remove
air silencer and filter.
NOTE: Service the valve rod plungers as an assembly.
6) Remove retainer, bearing, and rear seal.
NOTE: Never remove the rear seal from the rear shell unless seal
is defective and a new one is available.
7) Remove the push rod, front seal, and the support plate.
Cleaning & Inspection
1) Clean all parts and blow dry with compressed air. Inspect
all rubber parts for cuts, nicks, deterioration or other damage.
2) Check power piston for cracks, distortion, chipping, and
damaged seats. Inspect front and rear shells for scratches, scores,
pits, dents or other damage. Replace any defective parts.
Reassembly
1) Reverse disassembly procedure. Apply silicone grease to
parts before reassembly. When assembling rear shell to front shell,
make sure index marks are aligned.
2) Before installing master cylinder to power unit, measure
clearance between primary piston and power unit push rod. Clearance
on RX7 & GLC Wagon should be .004-.012" (.1-.3 mm).
3) On all other models, clearance should be .004-.020"
(.1-.5 mm). If clearance is not to specifications, correct by
adjusting push rod length.
Fig. 8:

Exploded View of Typical Power Brake Unit

Some models may vary slightly.
BRAKE SYSTEM
Article Text (p. 10)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 04:54PM