Hyundai Elantra: Brake System / Specifications

Hyundai Elantra (CN7) 2021-2024 Service Manual / Brake System / Specifications

Specifications

Item		Specification
Master cylinder	Cylinder I.D.	22.22 mm
	Piston stroke	45 ± 1 mm (1.77 ± 0.039 in)
	Fluid level switch	Provided
Brake booster	Type	10" Single
Brake booster	Boosting ratio	8.0 : 1
Front brake (15 inch disc)	Type	Ventilated disc
	Disc O.D.	Ø 280 mm (11.02 in)
	Disc thickness	25 mm (0.98 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 57.1 mm (2.25 in)
Front brake (16 inch disc)	Type	Ventilated disc
	Disc O.D.	Ø 305 mm (12.01 in)
	Disc thickness	25 mm (0.98 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 57.15 mm (2.25 in)
Rear brake (14 inch disc) / Hand lever parking brake	Type	Solid disc
	Disc O.D.	Ø 262 mm (10.31in)
	Disc thickness	10 mm (0.39 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 33.93 mm (1.34 in)
Rear brake (15 inch disc) / Electric parking brake (EPB)	Type	Solid disc
	Disc O.D.	Ø 284 mm (11.18in)
	Disc thickness	10 mm (0.39 in)
	Caliper piston	Single
	Cylinder I.D.	Ø 34.00 mm (1.34 in)
Rear drum brake	Type	Leading trailing
	Drum I.D	Ø 203.2 mm (8 in)
	Brake lining thickness	4.2 mm (0.17 in)
	Clearance adjustment	Automatic

Specification (VDC)

Part	Item	Standard value	Remark
HECU	System	4 Channel 4 Sensor control system	Total control (ABS, TCS, EBD, VDC)
	Type	Motor, valve relay intergrated type	ECU, TCU and CAN
	Operating Voltage	8V - 16V
	Operating Temperature	-40°C - 110°C
	Motor power	310W [Normal] / 370W [Plus]
Active Wheel speed sensor (ABS)	Supply voltage	Front : 1.25 - 20VDC
	Supply voltage	Rear : 4.5 - 20VDC
	Output current low	Front : 7 ± 1.05 mA
	Output current low	Rear :11.2 - 16.8 mA
	Output current high	Front : 14 ± 2.1 Ma
	Output current high	Rear : 11.2 ~ 16.8 mA
	Output range	Front : 0.03 ~ 3,000 Hz
	Output range	Rear : 0 ~ 2,500 Hz
	Tone wheel	Front : 46 teeth, Rear : 46 teeth
	Air gap	0.4 - 1.0 mm
Steering Wheel Angle Sensor	Operating Voltage	8V - 16V
	Current Consumption	Max. 150 mA
	Output measurement range	-780 to + 779.9°
	Operating Angular velocity	0 - 1016°/sec

Service Standard

Items	Standard value
Brake pedal height	135 ± 3 mm (5.31 ± 0.12 in)
Brake pedal Full stroke	183 mm (7.20 in)
Stop lamp switch clearance	1 - 2 mm (0.04 in - 0.08 in)
Brake pedal free play	2 - 4 mm (0.08 in - 0.16 in)
Front brake disc pad thickness [15 inch]	10.5 mm (0.41 in)
Front brake disc pad service limit [15 inch]	2.0 mm (0.07 in)
Front brake disc pad thickness [16 inch]	11 mm (0.43 in)
Front brake disc pad service limit [16 inch]	2.0 mm (0.07 in)
Front disc thickness	25 mm (0.98 in)
Front disc service limit	23 mm (0.91 in)
Rear brake disc pad thickness	10 mm (0.39 in)
Rear brake disc pad service limit	2.0 mm (0.07 in)
Rear disc thickness	10 mm (0.39 in)
Rear disc service limit	8.4 mm (0.33)
Rear drum brake lining thickness	4.2 mm (0.17 in)
Rear drum brake lining service limit	1.0 mm (0.04 in)

Tightening Torques

Items	N.m	kgf.m	lb-ft
Master cylinder to brake booster	9.8 - 15.7	1.0 - 1.6	7.2 - 11.6
Brake booster mounting nuts	16.7 - 25.5	1.7 - 2.6	12.3 - 18.8
Air bleeding screw	6.9 - 12.7	0.7 - 1.3	5.1 - 9.4
Brake tube flare nuts, brake hose	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 mounting bolts	78.5 - 98.1	8.0 - 10.0	57.9 - 72.3
Rear caliper mounting bolts	78.5 - 98.1	8.0 - 10.0	57.9 - 72.3
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
Wheel speed sensor mounting bolt	7.8 - 11.8	0.8 - 1.2	5.8 - 8.7
ESC control unit bracket mounting nuts	16.7 - 25.5	1.7 - 2.6	12.3 - 18.8

Lubricants

Items	Recommended	Quantity
Brake fluid	DOT 4	As required
Brake pedal hinge contacts	PDLV-1 (MS511-65)	0.2 - 0.7g
Clevis hole inside		0.1 - 0.5g
Member side spring seating surface
Pedal arm side spring seating surface

Troubleshooting

TroubleshootingProblem Symptoms TableUse the table below to help you find the cause of the problem. The numbers indicate the priority of the like cause of the problem...

Special service tools

Special Service Tools Tool (Number and Name) Illustration Use 09581-11000Piston expanderSpreading the front disc brake piston...

Other information:

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Side air bags

Front seat

Your vehicle is equipped with a side air bag in each front seat. The purpose of the air bag is to provide the vehicle’s driver and the front passenger with additional protection than that offered by the seat belt alone.