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Kia Sorento: Disc Brakes and Pads Repair procedures - Chassis - MaintenanceKia Sorento: Disc Brakes and Pads Repair procedures

Kia Sorento (MQ4, 2021-2026) Service Manual / Maintenance / Chassis / Disc Brakes and Pads Repair procedures

Inspection
Check the pads for excessive wear, discs for run out and wear, and calipers for fluid leakage.
Front Brake Disc Thickness Check
1.
Check the brake pads for wear and fade.
2.
Check the brake disc for damage and cracks.
3.
Remove all rust and contamination from the surface, and measure the disc thickness at 24 points, at least, at the same distance (10 mm, 0.4 in.) apart from the brake disc outer circle.
Front brake disc thickness
- For 17 inch wheel Standard : 30 mm (1.18 in)
- For 17 inch wheel Service limit : 28 mm (1.10 in)
DTV (Disc Thickness Variation) :
Circumference direction : Less than 0.005 mm (0.00020 in.)
Radial direction : Less than 0.010 mm (0.00040 in.)

Maintenance — Chassis / Disc Brakes and Pads / Repair procedures / Inspection illustration
4.
if the measured DTV larger than the limit and thickness thicker than the service limit of the disc, skim the brake disc.
Note
•
Skim the disc according to the method of using each skimming lathe. (On-car mounting or external device)
•
Do not skim the brake disc when it reaches the service limit.
5.
If the brake disc is thinner than the service limit, replace the brake disc.
Front Brake Disc Runout Check
1.
Place a dial gauge about 10 mm (0.4 in.) from the outer circumference of the brake disc, and measure the runout of the disc.
Brake disc runout
Limit : 0.050 mm (0.0016 in.) or less (new one)

Maintenance — Chassis / Disc Brakes and Pads / Repair procedures / Inspection illustration
2.
if the measured disc runout larger than the limit and thickness thicker than the service limit of the disc, skim the brake disc and measure the runout again.
Note
•
Skim the disc according to the method of using each skimming lathe. (On-car mounting or external device)
•
Do not skim the brake disc when it reaches the service limit.
3.
If the runout of the brake disc still exceeds the limit specification, replace the disc, and then measure the runout again.
Rear Brake Disc Thickness Check
1.
Check the brake pads for wear and fade.
2.
Check the brake disc for damage and cracks.
3.
Remove all rust and contamination from the surface, and measure the disc thickness at 24 points, at least, at the same distance apart (10 mm) from the brake disc outer circle.
Rear Brake disc thickness
- For 16 inch wheel Standard : 11 mm (0.43 in.)
- For 16 inch wheel Service Limit : 9.0 mm (0.35 in)
DTV (Disc Thickness Variation) :
Circumference direction : Less than 0.005 mm (0.00020 in.)
Radial direction : Less than 0.010 mm (0.00040 in.)

Maintenance — Chassis / Disc Brakes and Pads / Repair procedures / Inspection illustration
4.
if the measured DTV larger than the limit and thickness thicker than the service limit of the disc, skim the brake disc.
Note
•
Skim the disc according to the method of using each skimming lathe. (On-car mounting or external device)
•
Do not skim the brake disc when it reaches the service limit.
5.
If the brake disc is thinner than the service limit, replace the brake disc.
Rear Brake Disc Runout Check
1.
Place a dial gauge about 10 mm (0.4 in.) from the outer circumference of the brake disc, and measure the runout of the disc.
Brake disc runout
Limit : 0.055 mm (0.0021 in.) or less (new one)

Maintenance — Chassis / Disc Brakes and Pads / Repair procedures / Inspection illustration
2.
if the measured disc runout larger than the limit and thickness thicker than the service limit of the disc, skim the brake disc and measure the runout again.
Note
•
Skim the disc according to the method of using each skimming lathe. (On-car mounting or external device)
•
Do not skim the brake disc when it reaches the service limit.
3.
If the runout of the brake disc still exceeds the limit specification, replace the disc, and then measure the runout again.
Brake Pad Check
1.
Check the pad wear. Measure the pad thickness and replace it, if it is less than the specified value.
Front brake disc thickness pad thickness
- Standard : 11 mm (0.43 in)
- Service Limit : 2.0 mm (0.07 in)
Rear brake disc thickness pad thickness
- Standard : 10 mm (0.3937 in.)
- Service Limit : 2.0 mm (0.07 in)

Maintenance — Chassis / Disc Brakes and Pads / Repair procedures / Inspection illustration
2.
Check that grease is applied to sliding contact points and check the pad and backing metal for damage.
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See also:

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