1991 ACURA NSX Service Repair Manual

Rear Brak e Pad s
Inspection/Replacemen t
• Neve r us e a n ai r hos e o r dr y brus h t o clea n brak e
assemblies ,
Use a n OSHA-approve d vacuu m cleane r t o avoi d
breathin g brak e dust .
1 . Loose n th e rea r whee l nut s slightly , the n rais e eac h
sid e o f th e ca r an d suppor t i t o n safet y stand s (se e
pag e 1-9 throug h 1-11 ).
Remov e th e rea r wheels .
2 . Remov e th e calipe r shield .
3 . Remov e th e loc k pi n an d clevi s pin . Remov e th e ca -
bl e clip , an d disconnec t th e cabl e fro m th e arm . 4
. Remov e th e tw o calipe r mountin g bolt s an d th e
calipe r fro m th e bracket .
CAUTION :
• Thoroughl y clea n th e outsid e o f th e calipe r t o
preven t dus t an d dir t fro m enterin g inside .
• Suppor t th e calipe r wit h a piec e o f wir e s o tha t i t
doe s no t han g fro m th e brak e hose .
If linin g thicknes s i s les s tha n servic e limi t a t ste p
6, replac e th e brak e pad s a s a set .
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Rear Brak e Pad s
Inspection/Replacemen t (cont'd )
5. Remov e th e pa d shims , pad s an d pa d retainers .
6 . Usin g vernie r calipers , measur e th e thicknes s o f eac h
brak e pa d lining .
NOTE : Measuremen t doe s no t includ e pa d backin g
thickness .
7. Clea n th e calipe r thoroughly ; remov e an y rust , an d
chec k fo r groove s an d cracks .
8. Mak e sur e tha t th e pa d retainer s ar e installe d in th e
correc t positions .
9. Instal l th e ne w brak e pad s an d pa d shim s o n calipe r
bracket .
• Whe n reusin g th e pads , alway s reinstal l th e
brak e pad s i n thei r origina l position s t o preven t
los s o f brakin g efficiency .
• Contaminate d brak e disc s o r pad s reduc e stop -
pin g ability . Kee p greas e of f th e disc s an d pads .
NOTE :
• Appl y Molykote ® M7 7 t o th e shim s (se e pag e
19-16 ). Wip e exces s greas e of f th e shims .
• Instal l th e inne r pa d wit h it s wea r indicato r fac -
ing upward .
• Mak e sur e tha t th e pa d sprin g i s installe d ont o
the calipe r body .
10. Rotat e th e pisto n clockwis e int o plac e i n th e
cylinder , the n alig n th e cutou t i n th e pisto n wit h th e
tab o n th e inne r pa d b y turnin g bac k th e pisto n
back.
CAUTION : Lubricat e th e boo t wit h silicon e greas e
t o avoi d twistin g th e pisto n boot . I f th e pisto n boo t
i s twisted , bac k i t ou t s o i t sit s properly .
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11. Install and tighten the two caliper mounting bolts.

12. Insert the cable through the arm, and connect the

cable to the lever with the clevis pin and new lock

pin.

Install the new cable clip securely.

13. Install the caliper shield.

14. Depress the brake pedal several times to make sure

the brakes work, then test-drive the car.

NOTE: Engagement of the brake may require a

greater pedal stroke immediately after the brake

pads have been replaced as a set. Several applica-

tions of the brake pedal will restore the normal

pedal stroke.

1 5. Install the rear wheels and torque the wheel nuts.

NOTE: Clean the mating surfaces of the wheel and

hub before installing the wheel.ProCarManuals.com

Rear Brak e Dis c
Run-Ou t Inspectio n
1. Rais e eac h sid e o f th e car , an d suppor t i t o n safet y
stand s (se e pag e 1- 6 throug h 1-8 ). Remov e th e rea r
wheels .
2 . Remov e th e brak e pad s (se e pag e 19-17 ).
3 . Inspec t th e dis c surfac e fo r grooves , cracks , an d
rust . Clea n th e dis c thoroughl y an d remov e al l rust .
4 . Us e suitabl e nut s (1 2 x 1. 5 mm ) an d plai n washer s
t o hol d th e dis c securel y agains t th e hub , the n
moun t a dia l indicato r a s shown .
Brak e Dis c Runout :
Service Limit : 0.1 0 m m (0.00 4 in )
5. I f th e dis c i s beyon d th e servic e limit , refinis h th e
rotor .
Max . Refinishin g Limit : 19. 0 m m (0.7 5 in )
NOTE : A ne w dis c shoul d b e refinishe d i f it s
runou t i s greate r tha n 0. 1 m m (0.00 4 in) .
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Rear Calipe r
Disassembl y
• Neve r us e a n ai r hos e o r dr y brus h t o clea n brak e
assemblies .
• Us e a n OSHA-approve d vacuu m cleane r t o avoi d
breathin g brak e dust .
CAUTION :
• D o no t spil l brak e flui d o n th e car ; i t ma y damag e th e
paint ; i f brak e flui d doe s contac t th e paint , was h i t
of f immediatel y wit h water .
• T o preven t spills , cove r th e hos e joint s wit h rag s o r
sho p towels .
• Clea n al l part s i n brak e flui d an d ai r dry ; blo w ou t al l
passage s wit h compresse d air .
1 . Remov e th e calipe r shiel d (se e pag e 19-17 ).
2 . Disconnec t th e parkin g cabl e (se e pag e 19-17 ).
3 . Remov e th e banj o bol t an d tw o sealin g washers .
4 . Remov e th e tw o calipe r mountin g bolt s an d calipe r
body fro m th e bracket .
5. Remov e th e pa d sprin g fro m th e caliper .
6. Remov e th e pisto n an d pisto n boo t whil e rotatin g
the pisto n wit h a commercially-availabl e locknu t
wrench .
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7. Remov e th e circlip , washer , adjustin g sprin g A , an d
th e adjustin g nu t fro m th e piston . 9
. Adjus t th e specia l too l a s shown .
07HAE-SG0010 0
10 . Instal l th e specia l too l betwee n th e calipe r bod y
an d sprin g guid e a s shown .
11 . Compres s th e adjustin g sprin g B by turnin g th e
shaf t o f th e specia l tool , the n remov e th e circli p
wit h sna p rin g pliers .
07914-SA5000 0
07HAE-SG0010 0
8
. Remov e th e pisto n seal .
CAUTION : Tak e car e no t t o damag e th e cylinde r
bore.
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Rear Calipe r
Disassembl y (cont'd )
12. Remov e th e adjustin g bolt .
13. Remov e th e sprin g cover , adjustin g sprin g B ,
spacer , bearin g A an d cu p fro m th e adjustin g bolt .
14. Remov e th e sleev e piston , an d remov e th e pi n fro m
the cam .
1 5 . Remov e th e retur n spring .
16. Remov e th e parkin g leve r an d ca m a s a n assembl y
from th e calipe r body .
CAUTION : D o no t loose n th e parkin g nu t wit h th e
ca m installe d i n th e calipe r body . I f th e leve r an d
shaf t mus t b e separated , hol d th e leve r i n a vis e
an d loose n th e parkin g nut .
17. Remov e th e ca m boot .
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Reassembly
CAUTION:
• Mak e sur e al l part s ar e clea n befor e reassembly .
• Us e onl y ne w replacemen t parts .
• Us e onl y clea n DOT 3 o r 4 brak e fluid .
• D o no t allo w dir t o r othe r foreig n matte r t o con -
taminat e th e brak e fluid .
• Avoi d spillin g brak e flui d o n painted , plasti c o r rubbe r
surface s a s i t ca n damag e th e finish . Was h spille d
brak e flui d of f immediatel y wit h clea n water .
1 . Pac k al l cavitie s o f th e needl e bearin g wit h a com -
mercially-availabl e assembl y lube .
2. Coa t th e ne w ca m boo t wit h a commercially -
available assembl y lub e an d instal l i n th e caliper .
3 . Appl y commercially-availabl e assembl y lub e t o th e
pi n contactin g are a o f th e cam , an d instal l th e ca m
an d leve r assembl y int o th e calipe r body .
4. Instal l th e retur n spring .
CAUTION :
• Whe n th e ca m an d leve r wer e separated , b e
sur e t o assembl e the m befor e installin g th e ca m
i n th e calipe r body . Instal l th e leve r an d sprin g
washer , appl y lockin g agen t t o th e threads , an d
tighte n th e parkin g nu t whil e holdin g th e leve r
wit h a vise .
• Avoi d damagin g th e ca m boo t sinc e i t mus t b e
installe d befor e th e cam .
• Whe n installin g th e cam , d o no t allo w th e ca m
boo t lip s t o tur n outsid e in .
5. Instal l th e pi n in th e cam .
6. Instal l a ne w O-rin g o n th e sleev e piston .
7. Instal l th e sleev e pisto n s o th e hol e in th e botto m of
the pisto n is aligne d wit h th e pi n in th e cam , an d
the tw o pin s o n th e pisto n ar e aligne d wit h th e hole s
in th e caliper .
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