1987 MAZDA 626 Rear brake

PARKING BRAKE 1 1
INSTALLATION OF PARKING BRAKE CABLE
1. Install in the reverse order of removal, referring to installation note for specially marked parts.
2. Tighten all nuts and bolts to the specified torque, referring to torque specifications.
3. After installation:
(1) Adjust the parking brake lever stroke. (Refer to page 11—65.)
(2) Depress the brake pedal a few times and check that the rear brakes do not drag while the wheels
are being rotated.
Torque specifications
Rear drum brake
76G11X-053
11-69

1 1 PARKING BRAKE
Rear disc brake
(70—100 cm-kg, 61—87 In-lb)
86U11X-138
1. Parking brake cable (rear disc brake)
Installation Note
Parking brake cable (Rear disc brake)
Connect the cable end to the operating lever; then
tighten the locknut.
Tightening torque:
20—28 N m (2.0—2.9 m-kg, 14—21 ft-lb)
Caution
There must be no clearance between the ca-
ble end and the operating lever.
86U11X-139
11-70

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
ANTI-LOCK BRAKE SYSTEM (ABS)
STRUCTURAL VIEW
1. Hydraulic unit 4. Sensor rotor (front) 7. Wheel speed sensor (rear)
2. Relay box 5. Wheel speed sensor (front) 8. Sensor rotor (rear)
3. Control unit 6. Check connector
11—71

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
Troubleshooting Main Flow Chart
Check that the ABS warning light operates.

• Turn ignition switch OFF
to
ON, and check that ABS warning light illuminates constantly.

Flashing (Past failure)
OK
Check the ABS for failure.
• Start engine, and observe flashing
of
warning light.
Does not
illuminate
constantly
Warning light Possible cause
Does
not il-

luminate
at all

Refer
to
page 11—86.

ON
Alternator
L
ter-minal output Wiring harness (ALT-control unit) Control unit

OFF
1 sec

Alternator
L
ter-minal output Wiring harness (ALT-control unit) Control unit

ON
Relay box wiring harness (warning light-control unit) Control unit

OFF
1 sec

Relay box wiring harness (warning light-control unit) Control unit

No illumination
(Not diagnosed)
Illuminates constantly
(Present failure)
ABS is usually operating cor-rectly.
Consult table below when ABS failure
is
still suspected.
System Possible cause
ABS Brake light switch
Both rear wheel speed sensors
Control unit Proportioning
valve
in hy-
draulic unit
Other than Refer
to

ABS troubleshoot-ing guide
on

page 11—5.

Repair failures with flow
chart. (Refer to page
11—76.)
76G11X-054
11-74

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
Diagnosis Table
Note
Flashing of the warning light shows past failure, and its illumination shows present failure.
Diagnosis indication Possible failure Flow chart
No. Warning light Voltmeter Possible failure Flow chart
No.
ON
n
i2vn
OV

Hydraulic unit Harness
Right front wheel speed
sensor ABS-1
ON
n nn
Hydraulic unit Harness Left front wheel speed sensor ABS-2

OFF

Hydraulic unit Harness Left front wheel speed sensor ABS-2

OFF
nnn

Hydraulic unit Harness
Rear wheel speed sensor ABS-3

n
nnnn
Right front sensor rotor ABS-4

n
nnnnn
Left front sensor rotor ABS-5

JLilTUITLTL
Right rear sensor rotor ABS-6

jirLruiJum
Left rear sensor rotor ABS-7

J n
Hydraulic unit Harness
Control unit connector (11-pin)
ABS-8

nnnn

Hydraulic unit Harness
Control unit connector (11-pin)
ABS-8

J nn

Relay box
Hydraulic unit
Harness
ABS-9

jumruiTL

Relay box
Hydraulic unit
Harness
ABS-10

j nnn
Relay box
Hydraulic unit
Harness
ABS-11

jinnjuuL

Relay box
Hydraulic unit
Harness ABS-12

j nnnn

Relay box
Hydraulic unit
Harness
ABS-13

jiruuirirL

Relay box
Hydraulic unit
Harness
ABS-14

j nnnnn
Hydraulic unit Harness Control unit
ABS-15

juuuiruL

Hydraulic unit Harness Control unit ABS-16

j JinjiruifL.
Control unit
ABS-17

jiruinjiri—
JinjiruifL.
Control unit
ABS-18

j
No signal; failure condi-tions not stored
in
memory
Control unit Control unit connector (17-pin) Battery capacity Alternator output voltage Wiring harness (warning light-control unit-check connector)
Inspect, and repair or replace as necessary
j
No signal; failure condi-tions not stored
in
memory
No problem When warning light does
not
illuminate with engine running and
no
jumper wire

76G11X092
11-75

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
ABS-3
Possible failure
Rear wheel speed sensor, Harness, Hydraulic unit
Disconnect
Q-01
(11-pin)
con-

nector.
Check continuity
at
harness side.
Q-01 (11-pin) Continuity
G (2H) Ground No YG (2E) Ground No
Measure side.
Q-01 (11-pin) Resistance
YG (2E) YL (2F) 800—1200
fi
G (2H)
] L
(2J) 800—1200
fi
OK

Connect Q-01 (11-pin) connector. Jump GB
to B at
Q-07 connector. Start engine.
Check that warning light stays ON. Drive vehicle and check that warn-ing light flashes (0.25 sec ON OFF) at
15
km/h
(9
mph).

NG
Repair harness (Control unit
—
Rear speed sensor)

OK

resistance
at
harness

NG

Disconnect Q-09 and Q-05 Measure resistance
at
sensor.
Q-09, Q-05 Resistance
YG YL 800-1200
0
G L 800-1200
0
OK

Check followings* • Clearance between sensor and rotor standard: 0.3—1.1
mm
(0.012-0.043
in)
• Objects sticking
to
sensor
or
rotor
• Damaged sensor
or
rotor
• Sensor installation Tightening torque: 16-23 N-m
(1.6—2.3 m-kg, 12—17 ft-lb)

NG
Repair
or
replace
as
necessary

NG
Check Q-01 connector. Replace control unit.
or

OK

Replace hydraulic unit,
Replace rear wheel speed
sensor.

OK
Repair harness.
(Control unit
—
Rear speed sensor)
* All conditions can
be
verified
as
follows,
if an AC
voltmeter
is
available. 1. Jack
up
vehicle. 2. Measure sensor voltage while rotating rear wheel
one
revolution
per
second.

fi
wheel Q-01 (11-pin) Voltaqe (AC)
Left |YG (2E) YL (2F) More than 0.25V Right G (2H) L(2J)
More than 0.25V

86U11X-147
11-78

ANTI-LOCK BRAKE SYSTEM (ABS) 1 1
Removal of Rear Wheel Speed Sensor
1. Remove the wheel and tire.
2. Remove the parts shown in the figure, and remove
the sensor from the hub spindle.
86U11X-173
86U11X-174
86U11X-175
Installation of Rear Wheel Speed Sensor
1. Install the sensor to the hub spindle.
Tightening torque:
16—23 N m (1.6—2.3 m-kg, 12—17 ft-lb)
Caution
The left and right sensors are not interchange-
able. L or R is indicated on the bracket.
2. Install the sensor harness bracket onto the knuckle.
Tightening torque:
16—23 Nm (1.6—2.3 m-kg, 12—17 ft-lb)
3. Feed the sensor harness through the body and in-
stall the gromrnet.
4. Install the sensor harness bracket to the body.
Tightening torque:
11—26 N m (1.1—2.6 m-kg, 8—19 ft-lb)
Caution
Verify that the harness is not twisted and does
not contact the shock absorber or body when
the steering wheel is turned.
5. Connect the sensor connector.
6. Install the wheel and tire.
BRAKE LIGHT SWITCH
Refer to page 15—58.
76G11X-060
11-89

1 1 ANTI-LOCK BRAKE SYSTEM (ABS)
SENSOR ROTOR
Inspection
Check the sensor rotor for missing or damaged teeth.
86U11X-177
Removal of Front Sensor Rotor
1. Loosen the front wheel lug nuts.
2. Block the rear wheels.
3. Jack up the front of the vehicle and support it with safety stands.
4. Remove the wheels.
5. Remove in the sequence shown in the figure, referring to removal note for the specially marked parts.
86U11X-178
1. Hub cap
2. Locknut
3. Driveshaft (Refer to section 9)
4. Sensor rotor
11-90