Hyundai Elantra HD: Troubleshooting

Fourth generation (HD; 2007–2010) / Hyundai Elantra HD 2006–2010 Service Manual / Brake System / General Information / 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

Remedy

Lower pedal or spongy pedal

1.	Brake system (Fluid leaks)

2.	Brake system (Air in)

3.	Piston seals (Worn or damaged)

4.	Master cylinder (Faulty)

Repair
Air bleeding
Replace
Adjust

Brake drag

1.	Brake pedal free play (Minimum)

2.	Parking brake lever travel (Out of adjustment)

3.	Parking brake wire (Sticking)

4.	Pad or lining (Cracked or distorted)

5.	Piston (Stuck)

6.	Piston (Frozen)

7.	Return spring (Faulty)

8.	Booster system (Vacuum leaks)

9.	Master cylinder (Faulty)

Adjust
Adjust
Repair
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.	Pad or lining (Oily)

6.	Pad or lining (Glazed)

7.	Disc (Scored)

8.	Booster system (Vacuum leaks)

Repair
Air bleeding
Replace
Replace
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.	Return spring (Faulty)

8.	Brake pad shim (Damage)

9.	Shoe hold-down spring (Damage)

Replace
Retighten
Replace
Replace
Clean
Replace
Replace
Replace
Replace

Brake fades

1.	Master cylinder

Replace

Brake vibration,
pulsation

1.	Brake booster

2.	Pedal free play

3.	Master cylinder

Caliper

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.

Special Service Tools

Special Service Tools Tool (Number and Name) Illustration Use 09581 - 11000 Piston expander Pushing back of the fro ...

Brake System

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