Mitsubishi 1989-1993 GALANT Service Manual page 1203

SERVICE BRAKES
SERVICE POINTS OF INSTALLATION
. ADJUSTMENT OF CLEARANCE BETWEEN BRAKE
BOOSTER PUSH ROD AND PRIMARY PISTON
Adjust the clearance (A) between the brake booster push
rod and primary piston as follows:
end face and piston.
NOTE
To obtain (B), first take measurement with a square placed
on the master cylinder end face. Then, subtract the
thickness of the square to arrive at (B).
(2) Obtain the dimension (C) between the brake booster
mounting surface on the master cylinder and the end face.
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(3) Measure the dimension (D) between the master cylinder
mounting surface on brake booster and the push rod end.
NOTE
To obtain (D), first take measurement with a square placed
on the brake booster. Then, subtract the thickness of the
square to arrive at (D).
(4) Using the measured values obtained in (1) through (3).
obtain the clearance (A) between the brake booster push
rod and primary piston.
Standard value: [A (A= B-C-D)]
9 inch brake booster
(5) If the clearance is not within the standard value range,
adjust by changing the push rod length by turning the
adjustable end of the push rod.
Caution
Improper clearance may cause excessive brake drag.