1999 HONDA CIVIC brake fluid

Master Cylinder/Brake Booster
IRemovaUlnstallation
CAUTION:
. Be care{ul nol to bend or damage the brake lines when
rsmoving the mastsr cYlinder.
. Do not soill brakefluid on the vehicle; it may damage
the paint; if brake fluid does contact the paint, wssh
it off immediatelY with water'
. To prevent spill3, cover the hose ioints with rags or
shop towels.
9. Remove the four booster mountlng nuts
10. Pull the brake booster forward until the clevis is
clear of the bulkhead.
11. Remove the brake booster from the engine com-
panmenr.'12. Install the brake booster and master cylinder in the
reverse order of removal.
CAUTION:
. When connecting the brake lines. make sure
that there is no inte erence between the brake
lines and oth6r Parts.
r Be careful not to bend or damage the brake lines
when installing the master cylinder.
NOTE: lf replacing the master cylinder or brake
booster, check and adiust the pushrod clearance
be{ore installing the master cylinder (see page 19-221'
Fill the master cylinder reservoir, and bleed the
brake svstem (see Page 19-7).
After installation. check the brake pedal height and
brake pedal tree play (see page l9-5) and adjust if
necessary.
BRAKE BOOSTER(With ABS: 7" + 8" tandem brake booster)
BRAKE FLUIO LEVELSWITCH CONNECTORS
MASTER CYLINDER
VACUUM HOSE
1.
2.
3,
5.
Disconnect the brake fluid level switch connectors'
Remove the reservoir cap from the master cylinder'
The brake fluid may be sucked out through the top
of the master cylinder reservoir with a syrlnge.
Disconnect the brake lines from the master cylinder'
Remove the master cylinder mounting nuts and
washers.
\l/
6. Remove the master cylinder from the brake booster'
7. Disconnect the vacuum hose trom the brake booster'
8. Remove the cotter pin and clevis pin from the clevis'
CAUTION: Do not disconnect the clevb by remov-
ing it from the operating rod of the brako booster' lf
the clevis is loosened, adiust the pushrod length
before installing th€ brake booster (see page 19-221'
COTTER PINReplace.
To Rear Wheel Cylinders
14.
-6.4CLEVIS PIN
To Front Caliper(Without ABS)$
t'N't'ttrnt'-''
To Front CaliperlWithout ABSi
PBOPORTIONING CONTROL VALVE
15 N.m {1.5 kgl m,11 tbtft)
15 N.m {1.5 kgif.m, 11 lbtft}(With ABS: To modulator unit)lr
19-21

Rear Brake Caliper
Disassembly
@f l',lever use an air hose or dry brush to clean
assemblies.
. Use an OsHA-approved vacuum cleaner to
brake
avoid
breathing brake dust.
. Contaminated brake discs or pads reduce stopping
ability.
CAUTION:
. Do not spill brake tluid on the cal; h may damage the
paint; if brake fluid does contact the paint, wash ii
ofl immediatelY with water.
. To prevent spills, cover the hose ioints whh rags or
shop tow€ls.
. Clean all parts in brake fluid and air dry; blow out all
passagss with complessed air.
1. Remove the caliper shield (see page 19-24).
2. Remove the lock pin and clevis pin. Remove the
cable clip, and disconnect the cable from the arm
CABLE CLIP
Remove the banjo bolt and two sealing washers
Remove the two caliper mounting bolts and caliper
body from the bracket.
CALIPER MOUNTNG AOLTS
CALIPER BRACKETCheck for cracksSEALINGWASHERSReplace.BANJOBOLT
5, Remove the pins and pin boots from the caliper
bracket.
6. Remove the pad spring from the caliper body
PIN A
(cont'd)
19-27

IReassembly
HP* "n ",, hos6 or drv brush to ctoan brake assemblies.
o Use an OSHA-approved vacuum cleanel to avoid brealhing brake dust'
. Contaminated brake discs or pads reduce stopping sbility.
. When reusing the pads, in3tall thom in thoil original positions to prevent loss of braking efficiency'
CAUTION:
. Do not soill brake fluid on the vehicle; lt may damage lhe paint; if brake fluid does contacl the paint' wash it oft imme-
diately with water.
. Cl€an all Darts in brake fluid and air dry; blow out all passagss with comPressed air'
. Belore rsas3embling, check that all parts ars free ot du3t and othor tor€ign particles'
. Replace parts with new ones whenever spscifiod to do so.
o Make sur€ no dirt or othor foreign matter is allowed to contaminate the brake tluid'
. Always use Genuine Honda DOT 3 Brake fluid. Using a non-Honda brake fluid can Gtuse corrosion and decrease the
lif€ of ths system.
NOTE:
. Coat piston, piston seal, and caliper bore with clean brake fluid
. Replace all rubber parts with new ones whenever disassembled.
o .-'{@]: Use recommended silicone and pin greases in the caliper seal set.
. -ffi,Use recommended rubber grease in the caliper seal set.
RETuRN sPRTNG -"'9
8 mm FLANGE BOLT23 N.m (2.3 kgt'm, 17 lbf ftl
BLEED SCREW
@
9 N.m (0.9 kgtm,6.5lbf'ft|
CUP
=^.
PISTON BOOT
(cont'd)
19-31
BEARING A
PAO SPNING
F
\
OUTER PAD SHIM
r--- Replace..ffiPIN BOOTSReplace.
-61
@@-t-.
"l-r,r., "or"'*o " orr" I @.,23 N.m {2.3 kgtm, 17lbf.ftl \@
PISTON SEALReplace.
CALIPEBBRACKET
iiilji:ll;;
__X.,,..".^
BRAKE PAOS
PISTON
l/CALIPER BMCKET \MOUNTINGEOLTS ----.-,o,
54 N.m (5.5 kgf.m, 40lbl.ft) q%

10. lnstall the special tool onto the spring cover, and
turn the shaft until the locknut contacts the plate.
Check that the flared end of the spring cover is below
the circlip groove.
Install the circlip into the groove. then remove the
special tool.
NOTE: Check that the circlip is seated in the groove
properly.
11.
12.
CIRCLIP
t.t
SPRING COVER
13. Coat a new piston seal with recommended silicone
grease in the caliper seal set, and install it in the cali-
per.
PISTON BOOTReplace. RUBBER GREASE
Apply recommended rubber grease in the caliper
seal set to the sealing lips and inside of a new pis-
ton boot, and install it in the caliper.
Coat the outside of the piston with brake fluid, and
install it onto the adjusting bolt while rotating it
clockwise with the tool.
CAUTION: Avoid damaging the piston and piston
boot.
PISTON SEALReplace.
-6l
14.
PISTON
(cont'd)
19-33

Brake Hoses/Lines
Hose Replacement
CAUTION:
. Bgfore reagsembling, chgck that all parts are free of
dust and othor foroign particles.
. Repl8ce parts with new ones whenever specified to
do so,
. Do not spill brake fluid on th6 vehicle; it may damage
tho paint; if brake fluid does contact the paint, wash
it off immediately with water.
1.Replace the brake hose if the hose is twisted, cracked,
or if it leaks.
Disconnect the brake hose from the brake line using
a 10 mm flare nut wrench.
FLARE NUTWRENCHlCommerciallyava ilable)
BRAKE LINE
BRAKE HOSE
Remove and discard the brake hose cliD from the
brake hose.
Remove the banjo bolt, and disconnect the brake
hose from the caliper.
Remove the brake hose bracket from the knuckle.
19-40
10.
6. Install the brake hose bracket and brake hose onto
the knuckle first. then connect the brake hose to the
caliper with the banjo bolt and new sealing washers.
BRAKE HOSE
6 mm HOSE BRACKETBOLTS9.8 N.m{1.0 kgf m, 7 lbtfr}
BANJO BOI.T34 N.m{3.5 kgf.m,25 lbt.ftl
7. Install the brake hose onto the uooer brake hose
bracket with a new brake hose clip
15 N.m(1.s ks{.m, 11 lbl.ftl
Connect the brake line to the brake hose.
After installing the brake hose, bleed the brake sys-
tem (see page 19-7).
Perform the following checks:
. Check the brake hose and line joint for leaks, and
tighten if necessary.
. Check the brake hoses for interference and twist-
I ng.
8.

Anti-lock Brake System (ABSI
Featu res/Construction
When the brake pedal is depressed during driving, the wheels can lock before the vehicle comes to a stop, In such a case,the maneuverability of the vehicle is reduced if the front wheels are locked, and the stability of the vehicle is reduced if therear wheels are locked, creating an extremely unstable condition. The ABS precisely controls the slip rate of the wheels toensure the grip force of the tires. and it thereby ensures the maneuverbility and stability of the vehicle.Judging the vehicle speed. the ABS calculates the slip rate of the wheels based on the vehicle speed and the wheel speed,then it controls the brake fluid pressure to attain the target slip rate.
Grip Force of Tire and Road Surlace
COEFFICIENT OFFRICTION
TARGET SLIP RATE
Slip Rate
BRAKINGSTART POINT
ROTATIONALDIRECTION
RADIALDIRECTIONOF THEROTATIONALOIRECTION
A: Distance without slio8: Slippsd distanceC: Actuel distance
sr-rrmre=f=SLIP RATEVEIIICLE SPEED - WHEEL SPEEOVEHICLE SPEED
19-46

Anti-lock Brake System {ABS)
Operation (cont'dl
ABS Modulator
The ABS modulator consists of the inlet solenoid valve, outlet solenoid valve, reservoir, pump, pump motor and thedamping chamber.
The modulator reduces the caliper fluid pressure directly, and it is also referred to as a circulating type because the brake fluidcirculates through the caliper, reservoir and the master cylinder.The hydraulic control has three modes: pressure reducing, pressure retaining, and pressure intensifying.The hydraulic circuit is the independent four channel type, one channel for each wheel.
RF LR
Pressure intensifying mode: Inlet valve open, outlet valve closed
Pressure retaining mode:
Pressure reducing mode:
Motor operation mode:
rN: INLETVALVE {NORMALtY OpENIOUT: OUTIET VALVE {NORMALIY CTOSED)Master cylinder fluid is pumped out to the caliDer.Inlet valve closed, outlet valve closedCaliper fluid is retained by the inlet valve and outlet valve.Inlet valve closed, outlet valve oDenCaliper fluid flows through the outlet valve to the reservoir.When starting the pressure reducing mode, the pump motor is ON.When stopping ABS operation, the pump motor is OFF.The reservoir fluid is pumped out by the pump, through the damping chamber, to the mastercvlinder.
PUMP MOTOR
19-48

tJ
t\
Kickback
1. The motor operates when the ABS is functioning, and the fluid in the reservoir is forced out to the master cylinder
causing kickback at the brake pedal.
2. TheABScontrol unit operates the solenoid valve when the brake pedal is released afterthe initial diagnosis Youmay
hear the faint solenoid valve operation sound at this time. but it is normal.
Pump Motor
1. The pump motor operates when the ABS is functioning
2. The ABS control unit checks the pump motor operation during acceleration. You may hear the faint operation sound
at this time. but it is normal.
Brake Fluid Replacament/Air Blsading
1. Brake fluid replacement and air bleeding procedures are the same as for conventional brakes
Troubleshooting
1. The troubleshooting flowcharts explain the procedures on the assumption that the cause of the problem is still pre-
sent and the ABS indicator light is still on.
Note that troubleshooting following the flowchart when the ABS indicator light does not come on can result in incor-
rect judgment.
2. Ouestion the customer about the conditions when the problem occurred, and try to reproduce the same conditions
for troubleshooting.
self,diagnosis is made at various times such as the initial diagnosis, except ABS control. during ABS control, during
acceleraiion, during the specified vehicle speed, etc. Therefore, the symptom cannot be checked unless the check
conditions match with the problem conditions
3. When the ABS indicator light does not come on during the test drive, but the troubleshooting is performed based on
the DTC, check for the loose connectors. poor contact of the terminals, etc, before troubleshooting.
4. After troubleshooting, erase the DTC and test-drive the car. Be sure that the ABS indicator light does not come on.
5. The connector illustrations show the female connectors with a single outline and the male connectors with a double
ouflrne.
6. The connector terminal cavities containing female terminals are always numbered by looking at the connector from
the wire side. and the cavities containing male terminals are always numbered by looking at the connector from the
terminal side.
r'
19-55