Pushrod Clearance Adjustment - Honda Acura NSX 1991 Service Manual

Brake Booster
NOTE: Master cylinder pushrod-to-piston clearance
must be checked and adjustments made, if necessary,
before installing master cylinder.
Using the special tool, adjust bolt so the top of it is
flush with end of master cylinder piston.
ADJUSTMENT
GAUGE
2. Without disturbing the adjusting bolt's position, in-
stall the special tool upside down on the booster.
3. Install the master cylinder nuts and tighten to the
specified torque.
4. Connect the booster in-line with a vacuum gauge
(O-30 in Hg) to the booster's engine vacuum sup-
ply, and maintain an engine speed that will deliver
500 mm Hg (20 in Hg) vacuum.
5. With a feeler gauge, measure the clearance be-
tween the gauge body and the adjusting nut as
shown.
Clearance: O-O.4 mm (O-0.016 in)
Preferred: O-O.2 mm (O-0.008 in)
15 N-m (1.5 kg-m, 11 lb-ft)
FEELER
ADJUSTER
LOCKNUT
6. If clearance is incorrect, loosen the star locknut and
7. Tighten the star locknut securely.
STAR LOCKNUT
22 N-m
(2.2 kg-m, 16 lb-ft)
SECONDARY
PUSH
8. Adjust the pushrod length as shown if necessary.
VACUUM GAUGE
(Commercially
Available)
9. After adjustment, loosen the clevis end pushrod
(O-30 in Hg)
10. Adjust the brake light switch (page 19-4).
turn the adjuster in or out to adjust. Hold the clevis
while adjusting.
Remove the special tool and install a new master
cylinder rod seal in the booster.
ADJUSTMENT
O-O.4 mm (O-0.016 in)
O-O.2 mm (O-O.006 in)
Preferred.
NOTE: If the clearance between the gauge body
and adjusting nut is 0 mm, the pushrod-to-piston
clearance is 0.4 mm. If the clearance between the
gauge body and adjusting nut is 0.4 mm, the
pushrod-to-piston clearance is 0 mm.
locknut and turn the pushrod to obtain the correct
pedal height.
Standard Pedal Height From Floor:
Manual Transmission: 218 mm (8.58 in)
Automatic Transmission: 218 mm (8.58 in)
(with floor mat removed)
The pedal should have
1-5 mm free play.
GAUGE
LOCKNUT
15 Nom
Il.5 kg-m,
11 lb-ft)
19-15