ABS ACURA CSX 2006 Service Workshop Manual

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) Component Inspections:Component Procedure Also check for
Brake pedal sinks/fades when braking
Brake System Test
19-4 Conventional Brake Components
Brake System Inspection and Test
Inspect the brake system components listed. Repair or replace any parts that are leaking or damaged.










Master Cylinder Look for damage or signs of fluid leakage at:
Reservoir tank, subreservoir or master
cylinder body.
Lines, reservoir tank hose and grommets,
and their joints.
Between master cylinder and booster. Bulging seal at reservoir cap. This is a
sign of fluid contamination.
Brake Hoses Look for damage or signs of fluid leakage at: Line joints and banjo bolt connections.
Hoses and lines, also inspect for twisting or
damage. Bulging, twisted, or bent lines.
Caliper Look for damage or signs of fluid leakage at: Piston seal.
Banjo bolt connections.
Bleed screw. Seized or sticking caliper pins.
ABS or VSA
Modulator-control
Unit Look for damage or signs of fluid leakage at:
Line joints.
Modulator-control unit.
1. Set the parking brake, and start the engine, then turn off the A/C. Allow the engine to warm up to normal operating temperature (radiator fan comes on twice).
2. Attach a 50 mm (2 in.) piece of masking tape along the bottom of the steering wheel, and draw a horizontal reference mark across it.
3. With the transmission in neutral (M/T) or P or N (A/T), press and hold the brake pedal lightly (about the same pressure needed to keep an A/T-equipped vehicle from creeping), then release the parking brake.
4. While still holding the brake pedal, hook the end of the tape measure behind the brake pedal, then pull the tape up to the steering wheel. Note the measurement between the brake pedal and the reference mark on the steering
wheel.
5. Apply steady pressure to the brake pedal for 3 minutes.
6. Watch the tape measure.  If the measurement increases 10 mm (0.39 in.) or less, the master cylinder is OK.
 If the measurement increases more than 10 mm (0.39 in.), replace the master cylinder.
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µ
µ
µ
µ
µ
µ µ
µ
µ
µ
Rapid brake pad wear, vehicle vibration
(after a long drive), or high, hard brake pedal
YES
NO
YES
NO
YES
NO YES
NO
YES
NO
19-5
Symptom Troubleshooting
NOTE: Make sure that the caliper pins are installed
correctly.
Upper caliper pin B and lower caliper pin A are different.
If the pins are installed in the wrong location, it will
cause vibration, uneven or rapid pad wear, and
possibly uneven tire wear. For proper caliper pin
location: Except Type S model (see page 19-22), Type S
model (see page 19-23).
1. Drive the vehicle until the brakes drag or until the pedal is high and hard. This can take 20 or more
brake pedal applications during an extended test-
drive.
2. With the engine running, raise the vehicle on a lift, and spin all four wheels by hand.
Go to step 3.
Look for other causes of pad wear, high pedal,
or vehicle vibration.
3. Turn the ignition switch to LOCK (0), press the brake pedal several times to deplete the vacuum in
the brake booster, and then spin the wheels again
to check for brake drag.
Go to step 4.
Replace the brake booster (see page 19-27).
4. Without removing the brake lines, unbolt and separate the master cylinder from the brake
booster, then spin the wheels to check for brake
drag.
Go to step 5.
Check the brake pedal position switch
adjustment, and pedal free play (see page 19-6). 5. Loosen the hydraulic lines at the master cylinder,
then spin the wheels to check for brake drag.
Go to step 6.
Check the master cylinder reservoir for
contamination in the brake fluid. If you find
contamination, flush the entire brake system of all
contaminated fluid. If the brake fluid is OK, replace
themastercylinder(seepage19-24).
6. Loosen the bleed screws at each caliper, then spin the wheels to check for brake drag.
Check the master cylinder reservoir for
contamination in the brake fluid. If you find
contamination, flush the entire brake system of all
contaminated fluid. If the brake fluid is OK,
disassemble and repair the caliper, on the wheel(s)
with brake drag.
Look for and replace any damaged brake lines.
If all brake lines are OK, replace the ABS or VSA
modulator-control unit: ABS (see page 19-90), VSA
(see page 19-171).
I s t her e br ak e d r ag at any of t he w heel s?
I s t her e br ak e d r ag at any of t he w heel s?I s t her e br ak e d r ag at any of t he w heel s? I s t her e br ak e d r ag at any of t he w heel s?
I s t her e br ak e d r ag at any of t he w heel s?
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19-10Conventional Brake Components
Brake System Indicator Circuit Diagram
BRAKE FLUID
LEVEL SWITCH
CLOSED: Float down
OPEN: Float up
PARKING BRAKE
SWITCH
CLOSED: Lever pulled
OPEN: Lever released
BRAKE SYSTEM INDICATOR
GAUGE CONTROL MODULE (TACH)
INDICATOR DRIVER CIRCUIT
27 RED
WHT
1
19
28
G401 BLKGRN
ORN LT GRN ABS or VSA
MODULATOR-
CONTROL UNIT
(EBD INDICATOR)
ORN
2
1 1
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19-1119-11
Parking Brake Switch Test Brake Fluid Level Switch Test
AB
C
A
1
2
NOTE: If both the ABS indicator and the brake system
indicator come on at the same time, check the ABS or
VSA system for DTC’s first: ABS (see page 19-49), VSA
(see page 19-97).
1. Remove the center console (see page 20-92).
2. Disconnect the parking brake switch connector (A) from the parking brake switch (B).
3. Check for continuity between the switch terminal (C) and body ground.
 With the parking brake lever pulled, there s hould
be continuity.
 With the parking brake lever released, there should be no continuity.
NOTE: If the parking brake switch and fluid level
switch are OK, but the brake system indicator does
not function, do the gauge control module self-
diagnostic function (see page 22- 241).
4. Reconnect the parking brake switch connector.
5. Reinstall the center console (see page 20-92). 1. Disconnect the brake fluid level switch connector.
2. Check for continuity between the terminals (1) and
(2) with the float in the down position and in the up
position.
NOTE: Remove the brake fluid completely from the reservoir. With the float down, there should be
continuity.
 Fill the reservoir with brake fluid to the MAX (upper) level (A). With the float up, there should
be no continuity.
 If both the ABS indicator and the brake system indicator come on at the same time, check the
ABS or VSA system for DTC’s first: ABS
(see page 19-49), VSA (see page 19-97).
 If the parking brake switch and fluid level switch are OK, but brake system indicator does not
function, do the gauge control module self-
diagnostic function (see page 22-241).
3. Reconnect the brake fluid l evel switch connector.
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19-24 Conventional Brake Components
Master Cylinder Replacement
B
6x1.0mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
A B
D
E G
MASTER
CYLINDER SIDE
A
ABS: 15 N·m
(1.5 kgf·m, 11 lbf·ft)
VSA: 22 N·m
(2.2 kgf·m, 16 lbf·ft) C
15 N·m
(1.5 kgf·m,
11 lbf·ft)
D
F
 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.
 Be careful not to damage or deform the brake lines during removal and installation.
 Plug the ends of the hoses and the joints to prevent spilling brake fluid.
1. Remove the air cleaner (see page 11-345).
2. Remove the reservoir cap and brake fluid from the master cylinder reservoir with a syringe.
3. Disconnect the brake fluid l evel switch connector
(A).
4. Remove the reservoir tank mounting bolt (B). 5. Disconnect the brake lines (A) from the master
cylinder (B). To prevent spills, cover the hose joints
with clean rags or shop towels.
6. Remove the master cylinder mounting nuts (C) and washers (D).
7. Remove the master cylinder from the brake booster (E). Be careful not to bend or damage the brake
lines when removing the master cylinder.
8. Remove the rod seal (F) from the master cylinder. NOTE: During installation, set a new rod seal onto
the master cylinder with its grooved side (G)
toward the master cylinder.
9. Install the master cylinder in the reverse order of removal, and note these items:
 Coat the inner bore lip and outer circumference of the new rod seal with the Shin-Etsu silicone
grease (P/N 08798-9013).
 Make sure not to get any silicone grease on the terminal part of the connectors and switches,
especially if you have silicone grease on your
hands or gloves.
 Check the brake pedal height and free play after installing the master cylinder, and adjust it if
necessary (see page 19-6).
10. Bleed the brake system (see page 19-9).
11. Spin the wheels to check for brake drag.
Replace.
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")Connection
Point Component Connected to Specified Torque Value Note
19-37
Brake Hose and Line Inspection
A B
C DFC
A C
B
C
E
1. Inspect the brake hoses for damage, deterioration, leaks, interference, and twisting.
2. Check the brake lines for damage, rusting, and leaks. Also check for bent brake lines.
3. Check for leaks at hose and line joints and connections, and retighten if necessary.
4. Check the master cylinder and the ABS or VSA modulator-control unit for damage and leaks. A Front brake caliper Brake hose 34 N·m (3.5 kgf·m, 25 lbf·ft) Banjo bolt Bleed screw 9 N·m (0.9 kgf·m, 7 lbf·ft)
B Rear brake caliper Brake hose 34 N·m (3.5 kgf·m, 25 lbf·ft) Banjo bolt Bleed screw 9 N·m (0.9 kgf·m, 7 lbf·ft)
C Brake hose Brake line 15 N·m (1.5 kgf·m, 11 lbf·ft) Flare nut
D Master cylinder (ABS) Brake line 15 N·m (1.5 kgf·m, 11 lbf·ft) Flare nut Master cylinder (VSA) 22 N·m (2.2 kgf·m, 16 lbf·ft)
E ABS modulator-control unit Brake line 15 N·m (1.5 kgf·m, 11 lbf·ft) Flare nut VSA modulator-control unit Brake line (10 mm nut)15 N·m (1.5 kgf·m, 11 lbf·ft)
Brake line
(12 mm nut) 22 N·m (2.2 kgf·m, 16 lbf·ft)
F 4-way joint Brake line 15 N·m (1.5 kgf·m, 11 lbf·ft) Flare nut
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Brakes
....................................
Conventional Brake Components . 19-1
ABS (Anti-lock Brake System)
Components (’06-07 Models)
...................... ......................
VSA (Vehicle Stability Assist) System
Components (’07-09 Models) . 19-95
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Component Location Index
. 19-48
General Troubleshooting Information . 19-49
DTC Troubleshooting Index . 19-52
Symptom Troubleshooting Index . 19-55
System Description . 19-56
Circuit Diagram . 19-62
DTC Troubleshooting . 19-65
Symptom Troubleshooting . 19-88
ABS Modulator-Control Unit Removal and Installation . 19-90
Wheel Speed Sensor Replacement . 19-92
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19-48ABS Components
Component Location Index
UNDER-HOOD FUSE/RELAY BOX
UNDER-DASH FUSE/RELAY BOXRIGHT-REAR WHEEL SPEED SENSOR
ABS MODULATOR-CONTROL UNIT LEFT-FRONT WHEEL SPEED SENSOR
WHEEL BEARING
(MAGNETIC ENCODER)
RIGHT-FRONT WHEEL SPEED SENSOR
WHEEL BEARING
(MAGNETIC ENCODER)
DATA LINK CONNECTOR (DLC)
HUB BEARING UNIT
(MAGNETIC ENCODER)
LEFT-REAR WHEEL SPEED SENSOR
HUB BEARING UNIT
(MAGNETIC ENCODER)
Replacement, page 19-93
Removal and Installation, page 19-90
Replacement, page 19-92
Replacement, page 18-18
Replacement, page 19-92
Replacement, page 18-18 Replacement, page 18-32
Replacement, page 19-93
Replacement, page 18-32
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System IndicatorABS Indicator
Brake System Indicator
19-49
General Troubleshooting Information
AB
This system has two indicators: ABS indicator (A)
 Brake system indicator (B)
When the system is OK, each indicator comes on for
about 2 seconds after turning the ignition switch to
ON (II), then goes off.
When the system detects a problem, a DTC is set and,
depending upon the failure, the ABS modulator-control
unit determines which indicator(s) are turned on. If the
problem goes away (system returns to normal), the
indicator(s) are controlled in the following way
depending upon the DTC that is set:  The indicator(s) come on and stay on when the ignition switch is ON (II).
 The indicator(s) automatically go off.
 The indicator(s) go off after the vehicle is driven. The ABS indicator comes on when the ABS function is
lost. The brakes still work like a conventional system.
The brake system indicator comes on when the EBD
function is lost, the parking brake is applied, and/or the
brake fluid level is low.
NOTE: If two or more wheel speed sensors fail, the
brake system indicator comes on.
(cont’d)
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Diagnostic Trouble Code (DTC)
Self-diagnosis
Kickback
Pump Motor
Brake Fluid Replacement/Air BleedingHow to Troubleshoot DTCs
Intermittent Failures
19-50
ABS Components
General Troubleshooting Information (cont’d)
 The memory holds all 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 indicated in the order they occur.
 The DTCs are memorized in the EEPROM. Therefore, the memorized DTCs cannot be erased by
disconnecting the battery. Do the specified
procedures to clear the DTCs.
 Self-diagnosis can be classified into two categories: – Initial diagnosis: Done right after the ignition switch is turned to ON (II) and until the ABS indicator goes
off.
– Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to
LOCK (0).
 When the system detects a problem, the ABS modulator-control unit shifts to fail-safe mode.
The pump motor operates when the ABS modulator-
control unit is functioning, and the fluid in the reservoir
is forced out to the master cylinder, causing kickback at
the brake pedal.  The pump motor operates when the ABS modulator- control unit is functioning.
 The ABS modulator-control unit checks the pump motor operation one time after completing initial
diagnosis during regular diagnosis when the vehicle
is driven over 15 km/h (10 mph).
Brake fluid replacement and air bleeding procedures
are identical to the procedures used on vehicles without
ABS (see page 19-9). The troubleshooting procedures assume that the cause
of the problem is still present, and the ABS indicator is
still on. Following a troubleshooting procedure for a
code that has been cleared but does not reset can result
in incorrect diagnosis.
1. Question the client about the conditions when the problem occurred, and try to reproduce the same
conditions for troubleshooting. Find out when the
ABS indicator came on, such as during activation,
after activation, when the vehicle was traveling at a
certainspeed,etc.Ifnecessary,havetheclient
demonstrate the concern.
2. When the ABS indicator does not come on during the test-drive, check for loose connectors, poor
contact of the terminals, etc. in the circuit indicated
by the DTC before you start troubleshooting.
3. After troubleshooting, or the repairs are done, clear the DTCs, and test-drive the vehicle under the same
conditions that originally set the DTCs. Make sure
the ABS indicator does not come on.
4. Check for DTCs from other systems which are connected via F-CAN. If there are DTCs that are
related to F-CAN, one possible cause was that the
ignition switch was turned to ON (II) with the ABS
modulator-control unit connector disconnected.
Clear the DTCs. Check for fuel and emissions DTC’s
first.
NOTE: Always troubleshoot fuel and emissions
DTC’s first.
The term ‘‘intermittent failure’’ means a system may
have had a failure, but it checks OK now. If you cannot
reproduce the condition, check for loose connectors or
terminal pins related to the circuit that you are
troubleshooting.
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