Hyundai Ioniq: Brake System / Specifications

Hyundai Ioniq (AE) 2017-2024 Service Manual / Brake System / Specifications

Specifications

Item		Specification
Front disc brake	Type	Ventilated disc
	Disc O.D.	Ø 280 mm (11.02 in)
	Disc thickness	22 mm (0.87 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 57.2 mm (2.25 in)
Rear disc brake	Type	Solid disc
	Disc O.D.	Ø 262 mm (10.31 in)
	Disc thickness	10 mm (0.39 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 33.18 mm (1.31 in)
Parking brake	Type	BIR (Ball-in-Ramp)
Parking brake	Actuation	Lever

Specification (ESP)

Part	Item	Standard value	Remark
Integrated Brake Actuation Unit (IBAU)	System	4 Channel 4 Sensor (Solenoid)	Total control (ABS, EBD, TCS, ESC)
	Type	Valve relay integrated type
	Operating Voltage	10 - 15V
	Operating Temperature	-40 - 120 °C (-40 - 248°F)
Active Wheel speed sensor	Supply voltage	DC 4.5 - 20V
	Output current low	5.9 - 8.4 mA
	Output current high	11.8- 16.8 mA
	Output range	1 - 2500 Hz
	Tone wheel	Front: 46 teeth, Rear: 46 teeth
	Air gap	0.4 - 1.5 mm
Pressure Source Unit (PSU)	System	3 piston pump/ high pressure accumulator system
	Operating Voltage	10 - 15V
	Operating Temperature	-40 - 120°C (-40 - 248°F)

Service Standard

Items	Standard value
Brake pedal Full stroke	137.0 mm ( 5.39 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	22.0 mm (0.87 in)
Front brake disc service limit	20.0 mm (0.79 in)
Front brake disc pad thickness	17.0 mm (0.67 in)
Front brake disc service limit	8.0 mm (0.31in)
Rear brake disc thickness	10.0 mm (0.39 in)
Rear brake disc service limit	8.4 mm (0.33 in)
Rear brake disc pad thickness	15.0 mm (0.60 in)
Rear brake disc service limit	7.0 mm (0.28 in)

Tightening Torques

Items	N.m	kgf.m	lb-ft
Tire wheel hub nut	107.9 - 127.5	11.0 - 13.0	79.6 - 94.0
Air bleeding screw	6.9 - 12.7	0.7 - 1.3	5.1 - 9.4
Brake tube flare nuts	13.7 - 16.7	1.4 - 1.7	10.1 - 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	98.1 - 117.7	10.0 - 12.0	72.3 - 86.8
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	16.7 - 25.5	1.7 - 2.6	12.3 - 18.8
Brake pedal mounting nut	12.7 - 19.6	1.3 - 2.0	9.4 - 14.5
Wheel speed sensor mounting bolt	7.8 - 11.8	0.8 - 1.2	5.8 - 8.7
IBAU bracket mounting bolts	10.8 - 12.7	1.1 - 1.3	8.0 - 9.4
IBAU Brake Tube Flare nuts	13.7 - 16.7	1.4 - 1.7	10.1 - 12.3
PSU Bracket mounting bolts	19.6 - 29.4	2.0 - 3.0	14.5 - 21.7

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

High voltage shut-off procedures

High Voltage Shut-off Procedures • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system...

Special service tools

Special Service Tools Tool (Number and Name) Illustration Use 09581-2T100Piston expanderSpreading the front and rear disc brake piston...

Other information:

Hyundai Ioniq (AE) 2017-2024 Service Manual: High voltage battery handling guide

High voltage battery system inspection guide • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries...

Hyundai Ioniq (AE) 2017-2024 Service Manual: Fly Wheel. Repair procedures

Removal and Installation • Be sure to read and follow the "General Safety Information and Caution" before doing any work related with the high voltage system. Failure to follow the safety instructions may result in serious electrical injuries...