2003 HONDA CIVIC Workshop Manual

Conventional Brake Components
{Front Brake Caliper Overhaul
Frequent inhalation of brake pad dust, regardless of material composition, could be hazardous to your health.. Avoid breathing dust particles.' Never use an air hose or brush to clean brake assemblies. use an osHA-approved vacuum cleaner.
Remove, disassemble, inspect, reassemble, and install the caliper, and note these items:' Do not spill brake fluid on the vehicle; it may damage the paint; if brakefluidgetsonthepaint,washitoffimmediately with water.. To prevent dripping, cover disconnected hose joints with rags or shop towels.. Cleanall partsinbrakefluidandairdry;blowoutall passageswith compressed air.. Before reassembling, check that all parts are free of dust and other foreign particles.. Replace parts with new ones as specified in the illustration.. Make sure no dirt or other foreign matter is allowed to contaminate the brake fluid,' When reusing pads, always reinstallthem in their original pos itio ns to prevent loss of braking efficiency.. Do not reuse drained brake fluid.'AlwaysuseHondaDOT3brakefluid.Non'Hondabrakefluidcancausecorrosionandshortenthelifeofthesvstem.
. Do not mix different brands of brake fluid as they may not be compatible.. Coatthe piston, piston seal groove, and caliper borewithclean brakefluid.. Make sure no grease or oil gets on the brake discs or pads.. Replace all rubber parts with new ones whenever disassembled.. After installing the caliper, check the brake hose and line for leaks, interference, and twistinq.
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-ffi \--l u";;;lqEtCALIPER PIN A / 3.4N.m y' >vr / {3.5 kef m, / ,,' / 25 lbf ft) //'t / SEAL|NG)- I ---=-? WASHEaS
BRAKE HOSE / /8LEEO SCREW/ / /eNm/ / / (o.s kgr'm./ / | itbt.ftl,1(}', ^ l^ /caLl
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19-14
108 N.m 111.0 kgf.m,80 tbt.ft)

Master Cylinder Replacement
NOTE: Do not spill brake fluid on the vehicle; it may
damage the paint; if brake fluid does contact the paint,
wash it off immediately with water,
1, Remove the air cleaner assembly (A).
2, Disconnect the brake fluid level sensor connector
(A).
15 N.m{1.5 kgt.m, 11 lbt.ft)
3. Remove the clutch reservoir (B) andenginewire
harness clip (C)from the master cylinder mounting
base (D).
4. Remove the reservoir cap and brake fuid from the
reservoir.
5. Remove the reservoir (E) on the master cylinder
mountrng Dase.
6, Disconnect the brake lines (F)from the master
cylinder (G). To prevent spills, cover the hose joints
with rags or shop towels.
7. Remove the master cylinder mounting nuts {H) and
washers.
8. Remove the master cylinder from the brake booster.
Be careful not to bend or damage the brake lines
when removing the master cylinder.
9. Remove the rod seal (l) from the master cylinder.
10. Installthe master cylinder in the reverse order of
removal, and note these items:
. Replace all the rubber parts with new ones
whenever the master cylinder is removed.
. Check the pushrod clearance before installing the
master cylinder. and adjust it if necessary (see
page 19-16).. Use a new rod seal on reassemblY. Coat the inner bore lip and outer circumference
of the new rod seal {A) with the recommended
seal grease in the master cylinder set.
. Installthe rod seal ontothe master cylinder with
its grooved side (B)toward the master cylinder.
. Check the brake pedal height and free play after
installing the master cylinder, and adjust it if
necessary (see page 19-6).
19-15

Conventional Brake Components
Master Cylinder Inspection
NOTE:. Before reassembling, check that al I parts are f ree ofdust and other foreign particles.. Do nottryto disassemblethe mastercylinder
assembly. Replace the master cylinder assembly witha new part if necessary.. Do not allow dirt or foreign matter to contaminate thebrake fluid.
RESERVOIB CAPI unecK Ior otocKageof vent holes.
RESERVOIR
,--l RESERvOIR SEALCheck lor damaoe
RESERVOIR HOSESInspect hoses fordamage, leaks, anddeterioration.
r',,.J\+
v
MASTER CYLINDERCheck for leaks, rust, and damage
and deterioration.
STRAINERRemove accumulatedseotment.
19-16
Brake Booster Pushrod Clearance
Adjustment
SpecialTools Required
Pushrod adjustment gauge 07JAG-SD40100
NOTE: Brake booster pushrod-to-piston clearance mustbe checked and adjustments made, if necessarV, beforeinstalling the master cylinder.
1. Setthespecial tool (A) onthe mastercylinder bodv(B), push in the center shaft (C) until the top of itcontacts the end of the secondary piston {D) byturning the adjusting nut (E).
Without disturbing the center shaft's position,
installthe specialtool (A) backwards on the booster.
Install the master cylinder nuts (B), and tighten
them to the specified torque.
Connecl the booster in line with a vacuum gauge
{C) 0-101 kPa {0'-760 mmHg, 30 in.Hg) to thebooster's engine vacuum supply, and maintain anengine speed that will deliver 66 kPa (500 mmHg,20 in.Hg) vacuum.
15 N m {r.511 tbf.ftl

5. With a feeler gauge (A), measure the clearance
between the gauge body and the adjusting nut (B)
as snown,
lf the clearance between the gauge body and the
adjusting nut is 0.4 mm (0.02 in.), the pushrod-to-
piston clearance is 0 mm. However. if the clearance
between the gauge body and the adjusting nut is
0 mm, the pushrod-to-piston clearance is 0 4 mm
{0.02 in.) or more. Therefore it must be adjusted
and rechecked.
Clearance: 0-0./t mm (0-0.02 in.)
lf the clearance is incorrect, loosen the star locknut
(A). and turn the adjuster (B) in or out to adjust.
. Adjust the clearance while the specified vacuum
is appiied to the booster.. Hold the clevis (C) while adjusting.
A0 0.4 mm l0 -0.02 in.) 22N.n
07JAG-SO40100
7. Tighten the star locknut securely.
8. Remove the special tool (D).
9. Check the pushrod length (A) asshownifthe
booster is removed, lf the length is incorrect,
loosen the pushrod locknut (B), and turn the clevis
(C) in or out to adjust.
A116 mm {4.6 in.)
10. Installthe master cylinder (see page l9-15)
10 x 1.0 mm1.5 N'm11.5 kgf.m,11 lbf.ftl
19-17

Gonventional Brake Components
IBrake Booster Test
Functional Test
1. With the engine stopped, press the brake pedal
several times to deplete the vacuum reservoir, thenpress the pedal hard, and hold itfor 15 seconds. lfthe pedal sinks, either the master cylinder is
bypassing internally, or the brake system (master
cylinder, lines. modulator, or calipers) is leaking.
2. Start the engine with the brake pedal pressed. lf thepedal sinks slightly, the vacuum booster is workingproperly. lf the pedal height does not vary, thebooster or check valve is faulty.
3. With the engine running, press the brake pedal
lightly. lfthe brake pedal sinks more than 1O mm
{3/8 in, ) in 3 minutes, the master cylinder is faulty.A slight change in pedal height when the Ay'C
compressor cycles on and off is normal. (The A,/C
compressor load changes the vacuum available tothe booster.)
Leak Test
1. Press the brake pedal with the engine running, thenstop the engine. lf the pedal height does not vary
while pressed for 30 seconds, the vacuum boosteris OK. lf the pedal rises, the booster is faulty.
2. With the engine stopped, press the brake pedal
several times using normal pressure. When thepedal is first pressed, it should oe row.
On consecutive applications, the pedal height
should gradually rise. lfthe pedal position does notvarv, check the booster check valve.
19-18
3. Disconnect the brake booster vacuum hose (check
valve built-in) (A) at the booster side.
5.
4.Start the engine, and let it idle. There should bevacuum available. lf no vacuum is available, thecheck valve is not working properly. Repiace thebrake booster vacuum hose and check valve, andrelesI.
Reconnect the brake booster vacuum nose.
Start the engine, and then pinch the brake boostervacuum hose between the check valve and thebooster,
Turn the ignition switch OFF, and wait 30 seconds,Press the brake pedal several times using normalpressu re,
When the pedal is first pressed, it should be low.On consecutive applications, the pedal height
should gradually rise.
. lf the pedal position does notvary, replacethe
brake booster.. lf the pedal position varies, replace the brake
booster vacuum hose/check valve assembly.

Brake Booster Replacement
1.Remove the master cylinder (see page 19-15).
Remove the master cylinder brake lines {A) from
the brake line clip.
c
6x1.0mm9.8 N.m(1.0 kgf.m,7.2 tbf.ft)
Remove the vacuum hose mounting bracket (B).
Disconnect the vacuum hose {C) from the brake
booster.
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alu
i '..
5. Remove the clip (A) and the joint pin (B). and
disconnectthe yoke from the brake pedal.
7.
{'l.3 kgf.m,9 lbf.ftl
Remove the brake booster mounting nuts (C).
Remove the brake booster (A)from the engine
comparlmenr.
INdAdEI. Be careful not to damage the booster
surfaces and threads of the booster stud
bolts.. Be careful not to bend or damage the
brake lines.
lnstallthe brake booster in the reverse order of
removal, and note these items:
. Adjust the pushrod clearance before installing
the brake booster (see page 19-16).. Use a new clip whenever installing.. After installing the brake booster and master
cylinder, fill the reservoir with new brake fluid,
bleed the brake system (see page 19-8), and
adjust the brake pedal height and free play (see
page 19-6),
19-19

Conventional Brake Components
Rear Brake Pads Inspection and Replacement
Frequent inhalation of brake pad dust, regardless ofmaterial composition, could be hazardous to your
hea hh.. Avoid breathing dust particles.. Never use an air hose or brush to clean brake
assemblies, Use an OSHA-approved vacuum
cleaner.
Inspection
'1. Raise the rear of the vehicle, and support jt with
safety stands in the proper location (see page 1-8).Remove the rear wheels,
2. Check the thickness of the inner pad (A) andouterpad (B). Do not include the thickness of the brakepad backing plate.
Brake pad thickness:
Standard: 8.5 9.5 mm {0.33-0.37 in.}
Service limit: 1.6 mm (0.06 in.)
B -::--
lf the brake pad thickness is less than the servicelimit, replace allthe pads as a set.
3.
19-20
Replacement
1. Remove the bolt (A) and brake hose {B} from themounting bracket.
Remove the caliper bolts (C), and remove thecaliper (D) from the caliper bracket.
Remove the pad shims (A) and pads (B).3.
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4. Remove the pad retainers (A). and check the caliper
pins for free movement.
:.i _ _l
7.
8.
5. Clean the caliper thoroughly; remove any rust. and
check for grooves and cracks.
6, Check the brake disc for damage and cracks.
Apply Dow Corning Molykote M77 grease to the
retainers on their mating surfaces against the
caliper bracket,
Installthe pad retainers. Wipe excess grease offthe
retainers. Contaminated brake discs and pads
reduce stopping ability. Keep grease off the discs
and pads.
Apply Dow Corning Molykote lvl77 grease to both
sides of the pad shims {A), the back of the pads (B),
and the other areas indicated by the arrows. Wipe
excess grease off the shim. Contaminated brake
discs and pads reduce stopping ability. Keep
grease off the discs and pads.
9.
..-.
10. Installthe brake pads and pad shims correctly.
Installthe pads wirh the wear indicators {C) on the
inside.
lf you are reusing the pads, always reinstall the
brake pads in their original positions to prevent a
momentary loss of braking efficiency.
11. Rotate the caliper piston clockwise into the cylinder,
then align the cutout (A) in the piston with the tab
{B) on the inner pad by turning the piston back so
the caliper can be installed on the pad. Lubricate
the boot with rubber grease to avoid twisting the
Diston boot. lf the piston boot is twisted, back it out
so it is positioned properly.
8 x 1.25 mm22 N.ml2.2 kgt m,16 rbl.ttl
.ar
D8 x 1.25 mm23Nm{2.3 kgf.m,17 rbf.ft)
13.
14.
Installthe brake caliper (C) and caliper bolts (D).
and tighten the bolts to the specified torque.
Installthe brake hose (E).
Press the brake pedal several times to make sure
the brake works, then test-drive.
NOTE: Engagement of the brake may require a
greeter pedal stroke immediately after the brake
pads have been replaced as a set. Several
applications of the brake pedal will restore the
normal pedal stroke,
15. Check the parking brake adjustment {see page 19-7).
16. After installation, check for leaks at hose and line
joints or connections, and retighten if necessarY.
19-21