Hyundai Accent (HC): Brake System (ABS/ESC)

Hyundai Accent (HC) (2017 - 2022) Service Manual / Brake System (ABS/ESC)

Contents:

Specifications

- Specifications

Item		Specification
Master cylinder	Type	Single
	Cylinder I.D.	20.64 mm
	Piston stroke	36 ± 1 mm (1.41 ± 0.039 in)
	Fluid level switch	Provided
Brake booster	Type	10" Single
Brake booster	Boosting ratio	8.0 : 1
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 54.0 mm (2.13 in)
Rear disc 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 33.96 mm (1.34 in)
Rear drum brake	Type	Leading trailing
	Drum I.D	Ø 203.2 mm (8 in)
	Brake lining thickness	4.5 mm (0.17 in)
	Clearance adjustment	Automatic
Parking brake	Type	BIR (Ball-in-Ramp)
Parking brake	Actuation	Lever

Specification (ABS)

Part	Item	Standard value	Remark
HECU	System	4 Channel 4 Sensor (Solenoid)
	Type	Motor, valve relay intergrated type
	Operating Voltage	8 - 16V
	Operating Temperature	-40 - 120°C (-40 - 248°F)
	Motor power	195W
Active Wheel speed sensor (ABS)	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 : 48 teeth, Rear : 48 teeth
	Air gap	0.4 - 1.0 mm

Specification (ESP)

Part	Item	Standard value	Remark
HECU	System	4 Channel 4 Sensor (Solenoid)	Total control
	System	4 Channel 4 Sensor (Solenoid)	(ABS, EBD, TCS, ESP)
	Type	Motor, valve relay intergrated type
	Operating Voltage	8 - 16V
	Operating Temperature	-40 - 120°C (-40 - 248°F)
	Motor power	290W
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 - 2,500 Hz
	Tone wheel	Front : 48 teeth, Rear : 48 teeth
	Air gap	0.4 - 1.0 mm

Service Standard

Items	Standard value
Brake pedal height	180.7 mm (7.11 in)
Brake pedal Full stroke	108 mm (4.25 in)
Stop lamp switch clearance	1.0 - 2.0 mm (0.04 - 0.08 in)
Brake pedal free play	2 - 4 mm (0.08 in - 0.16 in)
Front brake disc thickness	22 mm (0.87 in)
Front brake disc service limit	20 mm(0.79 in)
Front brake disc pad thickness	17 mm (0.67 in)
Front brake disc pad service limit	8.0 mm (0.31 in)
Rear brake disc thickness	10 mm (0.39 in)
Rear brake disc service limit	8.4 mm (0.33 in)
Rear brake disc pad thickness	15 mm (0.59 in)
Rear brake disc pad service limit	7.0 mm (0.28 in)
Rear drum brake lining thickness	4.5 mm (0.17 in)

- Tightening Torques

Items	N.m	kgf.m	lb-ft
Master cylinder to brake booster	12.7 - 16.7	1.3 - 1.7	9.4 - 12.3
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	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	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
HECU bracket mounting and nut	16.7 - 25.5	1.7 - 2.6	12.3 - 18.8

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

Special Service Tools

- Special Service Tools

Tool(Number and Name)	Illustration	Use
09581-2T100 Piston expander		Spreading the front disc brake piston.
09580-0U000 Brake piston adjuster		Removal and installtion of the rear disc brake piston.
09964-C1100 FCA reflector		Reflector to align the FCA radar
09964-C1200 Calibration beam		Laser to detect the center of the vehicle.
09964-C1300 Tripod		FCA reflector or vertical / horizontal laser support.
09527-1S010 Sensor cap installer		Used for installing wheel speed sensor cap (Use with 09231-H1100)

Troubleshooting

- Troubleshooting Problem Symptoms Table Use the table below to help you find the cause of the problem. The numbers indicate the priority of the like cause of the problem. Check each part in order.If necessary, replace these parts.

Symptom	Suspect Area	Reference
Lower pedal or spongy pedal	1. Brake system (Fluid leaks) 2. Brake system (Air in) 3. Piston seals (Worn or damaged) 4. Rear brake shoe clearance (Out of adjustment) 5. Master cylinder (Inoperative)	repair air·bleed replace adjust replace
Brake drag	1. Brake pedal free play (Minimum) 2. Parking brake lever travel (Out of adjustment) 3. Parking brake wire (Sticking) 4. Rear brake shoe clearance (Out of adjustment) 5. Pad or lining (Cracked or distorted) 6. Piston (Stuck) 7. Piston (Frozen) 8. Anchor or Return spring (Inoperative) 9. Booster system (Vacuum leaks) 10. Master cylinder (Inoperative)	adjust adjust repair adjust replace replace replace replace replace replace
Brake pull	1. Piston (Sticking) 2. Pad or lining (Oily) 3. Piston (Frozen) 4. Disc (Scored) 5. Pad or lining (Cracked or distorted)	replace replace replace replace replace
Hard pedal but brake inefficient	1. Brake system (Fluid leaks) 2. Brake system (Air in) 3. Pad or lining (Worn) 4. Pad or lining (Cracked or distorted) 5. Rear brake shoe clearance (Out of adjustment) 6. Pad or lining (Oily) 7. Pad or lining (Glazed) 8. Disc (Scored) 9. Booster system (Vacuum leaks)	repair air·bleed replace replace adjust replace replace replace replace
Noise from brake	1. Pad or lining (Cracked or distorted) 2. Installation bolt (Loosen) 3. Disc (Scored) 4. Sliding pin (Worn) 5. Pad or lining (Dirty) 6. Pad or lining (Glazed) 7. Anchor or Return spring (Faulty) 8. Brake pad shim (Damage) 9. Shoe hold-down spring (Damage)	replace adjust replace replace clean replace replace replace replace
Brake fades	1. Master cylinder (Inoperative)	replace
Brake vibration, pulsation	1. Brake booster (Vacuum leaks) 2. Pedal free play 3. Master cylinder (Inoperative) 4. Caliper (Damage) 5. Master cylinder cap seal 6. Damaged brake lines	replace adjust replace replace replace replace
Brake Chatter	Brake chatter is usually caused by loose or worn components, or glazed or burnt linings. Rotors with hard spots can also contribute to brake chatter. Additional causes of chatter are out-of-tolerance rotors, brake lining not securely attached to the shoes, loose wheel bearings and contaminated brake lining.

Brake Bleeding Procedures

- Brake Bleeding Procedures Brake System Bleeding

• Do not reuse the drained fluid.

• Always use genuine DOT3/DOT4 brake Fluid.Using a non-genuine DOT3/DOT4 brake fluid can cause corrosion and decrease the life of the system.

• Make sure no dirt or other foreign matter is allowed to contaminate the brake fluid.

• Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.

• The reservoir on the master cylinder must be at the MAX (upper) level mark at the start of bleeding procedure and checked after bleeding each brake caliper. Add fluid as required.

1.Make sure the brake fluid in the reservoir is at the MAX (upper) level line.

2.Have someone slowly pump the brake pedal several times, and then apply pressure.

3.Loosen the right-rear brake bleed screw (A) to allow air to escape from the system. Then tighten the bleed screw securely.[Front]

[Rear Disc Brake]

[Rear Drum Brake]

4.Repeat the procedure for wheel in the sequence shown below until air bubbles no longer appear in the fluid.

5.Refill the master cylinder reservoir to MAX (upper) level line.

ABS System Bleeding This procedure should be followed to ensure adequate bleeding of air and filling of the ESC unit, brake lines and master cylinder with brake fluid.

1.Remove the reservoir cap and fill the brake reservoir with brake fluid.

• If there is any brake fluid on any painted surface, wash it off immediately.

• When pressure bleeding, do not depress the brake pedal.

• Recommended fluid........ DOT3 or DOT4

2.Connect a clear plastic tube to the wheel cylinder bleeder plug and insert the other end of the tube into a half filled clear plastic bottle.

3.Connect the GDS to the data link connector located underneath the dash panel.

4.Select and operate according to the instructions on the GDS screen

• You must obey the maximum operating time of the ESC motor with the GDS to prevent the motor pump from burning.

1)Select vehicle name.

2) Select ABS/ESC system.

3)Select HCU air bleeding mode.

5.Pump the brake pedal several times, and then loosen the bleeder screw until fluid starts to run out without bubbles. Then close the bleeder screw (A).[Front]

[Rear Disc Brake]

[Rear Durm Brake]

6.Repeat the procedure for wheel in the sequence shown below until air bubbles no longer appear in the fluid.

7.Refill the master cylinder reservoir to MAX (upper) level line.

Brake System ➤

Parking Brake System ➤

ABS(Anti-Lock Brake System) ➤

ESP(Electronic Stability Program) System ➤

Forward Collision-Avoidance Assist (FCA) System ➤

Seat Belt Pretensioner

Brake System

Other information:

Hyundai Accent (HC) (2017 - 2022) Service Manual: Description and Operation

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Hyundai Accent (HC) (2017 - 2022) Service Manual: Piston and Connecting Rod

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