Brake system HONDA CIVIC 2003 7.G Owner's Manual

Conventional Brake Components
Brake System Bleeding
NOTE:. Do not spill brake fluid on the vehicle; it may damage
the painU if brake fluid does contact the paint. wash it
off immediately with water.. The reservoir on the master cylinder must be at the
MAX (upper) level mark at the start of the bleeding
procedure and checked after bleeding each brake
caliper. Add fluid as required.. Do not reuse the drained fluid.. Always use Honda DOT 3 brake fluid. Non-Honda
brake fluid can cause corrosion and shorten the life of
the system.. Make sure no din or other foreign matter is allowed
to contaminate the brake fluid.
1. Make sure the brake fluid level in the reservoir is at
the MAX (upper) level line (A).
Slide a piece of clear plastic hose over the flrst
bleed screw, and submerge the other end in a
container of new brake fluid.
Have someone slowly pump the brake pedal
severaltimes, then apply steady pressure.
Starting at the left-front, loosen the brake bleed
screw to allow air to escape from the system. Then
tighten the bleed screw securely.
2.
19-8
5. ReDeatthe procedure for each wheel in the
sequence shown below until air bubbles no longer
appear in the fluid.
BLEEDING SEOUENCE:
OFront RightORe.r Right
O Front LeftORoar Loft
Refill the master cylinder reservoir to the MAX
{upper) level line.
FRONT BRAKE:
9 N.m 10.9 kgf.m,7 lbl.ft)
t-
REAR BRAKE:
9 N m 10.9 kgf.m, 7 lbf ft)

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19-9

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.
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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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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

Rear 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 installthe caliper, and note these items:
. Donotspill brake fluid on the vehicle; it may damage the paint; if brake f luid gets on the paint, wash it off
immediately 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 pans with new ones as specified in the illustration.. Make sure no dirt or other foreign matter contaminates the brake fluid.
. When reusing pads, always reinstallthem in their original positions to prevent loss of b ra king efficie ncy.
. Do not reuse drained brake fluid.
. Use only clean Honda DOT 3 brake fluid. Non-Honda brake fluid can cause corrosion and shorten the life of the
system.. Do not mix different brands ot brake fluid as they may not be compatible.
. Coatthe piston, piston seal groove, and caliper bore with clean brake fluid.
. Make sure no grease or oil gets on the brake discs or pads.
. Replaceall rubber parts with new ones whenever disassembled.
. After installing the caliper, check the brake hose and line for leaks, interference. and twisting.
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19-23

Brake Hose Replacement
NOTE:. Do not spill brake fluid on the vehicle; it may damage
the paint; if brake fluid gets on the paint, wash it off
immediately with water.. To prevent dripping, cover disconnected line joints
with rags or shop towels.. Before reassembling, check that all parts are free of
dust and other foreign particles.
. Replace parts with new ones whenever specified to
do so.
1 . Replace the brake hose (A) if the hose is twisted,
cracked, or if it leaks.
Disconnect the brake hose from the brake line (B)
using a 10 mm flare nut wrench {C)
Remove the flange bolt (A), and remove the brake
hose brackets from the damper.
Remove and discard the hose clip (B).
Remove the banjo bolt (C), and remove the brake
hose (D) {rom the caliper.
4.
I x 1.25 mm
6. Installthe brake hose bracket (A)on the damper
with the flange bolt (B) first, then connect the brake
hose (C) to the caliper with the banjo bolt {D) and
new sealing washers (E).
7. lnstallthe hose onto the hose bracket on the bodv
with a new hose clip (A).
10 x 1.0 mm15 N.mi (1.5 kgf.m,
! 1t tbt.ftl
Connect the brake line to the brake hose.
After installing the brake hose, bleed the brake
system (see page l9-8).
Do the following checks:
. Check the brake hose and line joint for leaks, and
tighten if necessary.. Check the brake hoses for interference and
twisting.
9.
10.
19-25

Brakes
Conventional Brake Components ................ 1 9-1
ABS (Anti-lock Brake System) Components
Comoonent Location lndex .............,........................... 19-30
General Troubleshooting Information ....................... 19-31
DTC Troubleshooting Index .............. 19-34
Symptom Troubleshooting Index ...,........................... 19-35
System Description ................. ........... 19-36
Circuit Diagram ......... 19-42
DTC Troubleshooting ............... .......... 19-45
ABS Indicator CircuitTroubleshooting ...................... 19-52
Brake System Indicator Circuit
Troubleshooting ...................... ....... 19-55
ABS Modulator-Control Unit Removal and
lnstallation ............. 19-57
Wheel Sensor Insoection ................... 19-59
Wheel Sensor Reolacement .............. 19-59

General Troubleshooting Information
ABS Indicator
. lf the system is OK,theABS indicator goes off 2
seconds after turning the ignition switch ON (ll)
without starting the engine, and then comes on again
and goes off 2 seconds later after starting the engine.
This occurs because the ABS control unitisturned
on by the lG2 power source.. The ABS indicator comes on when the ABS control
unit detects a problem in the system. However, even
though the system is operating properly, the indicator
will come on under these conditions:- Only the drive wheels rotate- One drive wheel is stuck- The vehicle goes into a spin- The ABS continues to operate for a long time.- The vehicle is subjected to an electrical signal
disturbance
To determine the actual cause of the problem, question
the customer about the problem. taking the above
condilions into consideration.
. When a Droblem is detected and lhe ABS indicator
comes on, there are cases when the indicator stays
on until the ignition switch is turned OFF, and cases
when the indicator goes off automatically when the
sYstem returns to normal.- DTC 61: The ABS indicator goes off automatically
when the system returns to normal.- DTC 11, 13,15,17 ,31,32,33, 34, 35, 36, 37, 38, 54,
or 81: The ABS indicator stays on until the ignition
switch is turned OFF whether or not the system
returns to normal.- DfC 12, 14, 16, 1a,21,51,52, or 53; The ABS
indicator goes off when the vehicle is driven again
and the system is OK after the ignition switch is
turned from OFF to ON {ll}.
Diagnostic Trouble Code {DTCI
. The memory can hold three DTCS. However, when
the same DTC is detected more than once, the more
recent DTC is written over the earlier one.
Therefore, when the same problem is detected
repeatedly, it is memorized as a single DTC.. The DTCs are in the order they occurred, beginning
with the most recent.. The DTCS are memorized in the EEPROM (non-
volatile memory). Therefore. the memorized DTCs
are not cleared when the battery is disconnected, the
ignition switch is turned off, or the system returns to
normal. Do the specified procedures to clear the
DTCs.
Self-diagnosis
. Self-diagnosis can be classified into two categories:- Initial diagnosis:
Done right after the engine starts and until the ABS
indicator goes off- Regular diagnosis:
Done rightafterthe initial diagnosis until the
ignition switch is turned OFF. When a problem is detected by self-diagnosis, the
system does the following:- Turns the ABS indicator on- Memorizes the DTC- Stops ABS control
Kickback
The pump 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.
Pump Motor
. The pump motor operates when the ABS is
functioning.. The ABS control unit checks the pump motor
operation when the vehicle is started the first time
after the ignition switch is turned ON (ll). You may
hear the motor operate at this time, but it is normal.
(cont'd)
19-31

4. The blinking frequency indicates the DTC. DTCS are
indicated by a series of long and short blinks. One
long blink equals 10 shon blinks. Add the long and
short blinks together to determine the DTC. After
determining the DTC, refer to the DTC
Troubleshooting Index.
NOTE:. lf the DTC is not memorized, the ABS indicator
will go off for 3.6 seconds, and then come back
on.. lf the ABS indicatorstays on, troubleshootfor"ABS indicator does not go off" (see step 1 onpage 19-53).
Th€ system will not indicate the DTC unless these
conditions are met:. The brake pedal is not pressed.. The ignition switch is turned ON {ll).. The SCS circuit is shorted to body ground before
the ignition switch is turned ON (ll).
Example ot DTC 15
Long blinkShort blinks{five timesl
Examole of DTC 22
Long blinks (two times)
Turn the ignition swltch OFF,
Disconnect the Honda PG M Tester from the DLC.
5.
How to Clear ABS DTCs
Honda PGM Tester Method:
1. With the ignition switch OFF, connect the Honda
PGM Tester (A)to the l6Pdata link connector (DLC)
{B} under the driver's side of the dashboard.
Turn the ignition switch ON (ll), and clearthe
DTC(s) by following the screen prompts on the
PGM Tester.
NOTE: See the Honda PG l\4 Tester user's manual
for sDeclf ic instructions.
Cycling the lgnition Switch Method:
Clear the DTC by turning the ignition switch ON (ll) then
OFF at least 20 times.
19-33

Symptom Troubleshootin g Index
SymptomDiagnostic procedureAlso check forABS indicator does nol come onABS Indicator Circuit Troubleshooting (see page
19-52)
ABS indicator does not go off and no
ABS DTC is stored
ABS Indicator Circuit Troubleshooting {see step 1
on Daqe 19-53)
Brake system indicator does nol come
on
Brake System lndicator Circuit Troubleshooting(see paqe 19-55)
Brake system indicator does not go off
and no ABS DTC is stored
Brake System Indicator Circuit Troubleshooting(see steo 1 on Daqe 19-55)
19-35