Kia Optima: Specifications

Specifications

Item		Specification
Master cylinder	Type	Single
	Cylinder I.D.	22.22mm
	Piston stroke	45±1 mm (1.77±0.039 in)
	Fluid level switch	Provided
Brake booster	Type	11" Single
Brake booster	Boosting ratio	9:1
Vacuum pump	Type	Electric vacuum pump (Multi vane type)
Vacuum pump	Vacuum checking type	Vacuum switch
Front disc brake	Type	Ventilated disc
	Disc O.D.	Ø 300 mm (11.81 in), Ø 320 mm (12.60 in)
	Disc thickness	28 mm (1.10 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 60 mm (2.36 in)
Rear disc brake	Type	Solid disc
	Disc O.D.	Ø 284 mm (11.18 in)
	Disc thickness	10 mm (0.39 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 34 mm (1.34 in), Ø 38.2 mm (1.50 in)
Parking brake	Type	DIH (Drum in hat)
Parking brake	Drum I.D.	Ø 168 mm (6.61 in)

O.D. : Outer Diameter

I.D : Inner Diameter

Specification (ESC)

Part	Item	Standard value		Remark
HECU	System	4 Channel 4 Sensor (Solenoid)		Total control (ABS, EBD, TCS, ESC)
	Type	Motor, valve relay integrated type
	Operating Voltage	10 ~ 16 V
	Operating Temperature	-40 ~ 120 °C (-40 ~ 248°F)
	Motor power	270 W
Active Wheel speed sensor	Supply voltage	DC 4.5 ~ 20 V
	Output current low	5.9 ~ 8.4 mA
	Output current high	11.8~ 16.8 mA
	Output range	1 ~ 2500 Hz
	Tone wheel	Front: 48 teeth, Rear: 47 teeth
	Air gap	Front	0.4 ~ 1.5 mm
		Rear	0.4 ~ 1.0 mm
Yaw rate& Lateral G sensor (CAN TYPE)	Operating Voltage	7 ~ 18 V
	Current Consumption	Max. 150 mA
	Yaw rate sensor measurement range	-75 ~ +75 °/sec
	Lateral G sensor measurement range	-14.715 ~ 14.715 m/s²

Service Standard

Items	Standard value
Brake pedal Full stroke	135 mm (5.31 in)
Stop lamp switch clearance	1.0 ~ 2.0 mm (0.04 ~ 0.08 in)
Brake pedal free play	3 ~ 8 mm (0.12 ~ 0.31 in)
Front brake disc thickness	28 mm (1.10 in)
Front brake disc pad thickness	11 mm (0.43 in)
Rear brake disc thickness	10 mm (0.39 in)
Rear brake disc pad thickness	10 mm (0.39 in)

Tightening Torques

Items	N.m	kgf.m	lb-ft
Hub nut	88.3 ~ 107.9	9.0 ~ 11.0	65.1 ~ 79.6
Master cylinder to brake booster	12.7 ~ 16.7	1.3 ~ 1.7	9.4 ~ 12.3
Brake booster mounting nuts	12.7 ~ 15.7	1.3 ~ 1.6	9.4 ~ 11.6
Air bleeding screw	6.9 ~ 12.7	0.7 ~ 1.3	5.1 ~ 9.4
Brake tube flare nuts	12.7 ~ 16.7	1.3 ~ 1.7	9.4 ~ 12.3
Front caliper guide rod bolts	21.6 ~ 31.4	2.2 ~ 3.2	15.9 ~ 23.1
Rear caliper guide rod bolts	21.6 ~ 31.4	2.2 ~ 3.2	15.9 ~ 23.1
Front caliper assembly to knuckle	78.5 ~ 98.1	8.0 ~ 10.0	57.9 ~ 72.3
Rear caliper assembly to knuckle	63.7 ~ 73.5	6.5 ~ 7.5	47.0 ~ 54.2
Brake hose to caliper	24.5 ~ 29.4	2.5 ~ 3.0	18.1 ~ 21.7
Brake pedal member bracket bolts	9.8 ~ 14.7	1.0 ~ 1.5	7.2 ~ 10.8
Brake pedal shaft nut	29.4 ~ 34.3	3.0 ~ 3.5	21.7 ~ 25.3
Wheel speed sensor mounting bolt	7.8 ~ 9.8	0.8 ~ 1.0	5.8 ~ 7.2
HECU bracket mounting bolt and nut	19.6 ~ 29.4	2.0 ~ 3.0	14.5 ~ 21.7
Yaw rate&G sensor mounting bolts	3.9 ~ 5.9	0.4 ~ 0.6	2.9 ~ 4.3

Lubricants

Items	Recommended	Quantity
Brake fluid	DOT 3 or DOT 4	As required
Brake pedal bushing and bolt	Chassis grease	As required
Parking brake shoe and backing plate contacting surface	Heat resistance grease	As required
Front Caliper guide rod and boot	AI-11P	1.2g ~ 1.7g (Trailing) 1.0g ~ 1.5g (Leading)
Rear Caliper guide rod and boot	AI-11P	0.8 g ~ 1.3g

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Special Service Tools Tool(Number and Name) Illustration Use 09581-11000 Piston expander Spreading the front and rear ...

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