Mazda 323 1988 Workshop Manual page 757

MASTER CYLINDER i i
Locknut
Piston to Push Rod Clearance
Before installing the master cylinder, check the clear-
ance between the piston of the master cylinder and
the push rod of the power brake unit as follows.
1. Place the
SST
on the top of the master cylinder;
then turn the adjust bolt until it contacts the bot-
tom of the push rod hole in the piston.
2. Apply 500
mm-Hg (19.7 in-Hg)
vacuum to the
power brake unit with a vacuum pump.
3. Invert the adjustment gauge used in step 1, and
place it on the power brake unit.
4. Check the clearance between the end of the gauge
and the push rod of the power brake unit. If it is
not 0
mm,
loosen the push rod locknut and turn
the push rod to adjust.
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