Kia Optima: Inspection - Brake Booster. Repair procedures - Brake System - Brake System - Kia Optima TF 2011-2020 Service ManualKia Optima: Inspection

Brake Booster

1. Inspect the check valve in the vacuum hose, intensifier and the connecting section.
Do not remove the check valve from the vacuum hose.
2. Check the boot for damage.

Vacuum Pump
1. Check the brake warning lamp in the IGN ON position.
Brake warning lamp is ON as below conditions.
1. Parking brake warning
2. Low brake fluid level warning
3. Low brake vacuum pressure warning
- Vacuum pump is abnormal condition
- Vacuum pump CAN communication is abnormal condition
- Vacuum switch is abnormal condition
2. Check that the brake warning lamp is ON after the release the parking brake with a sufficient brake fluid level.

If the brake warning lamp is ON, check the below points.

(1) Is the brake warning lamp ON within 5 seconds after IGN ON? (CAN Timeout Error)
CAN Timeout Error ; The brake warning lamp is ON when the communication fails more than 2 seconds between vacuum pump and cluster.

▶ Reinstall the vacuum pump connector after removing it. And if the brake warning lamp is ON within 5 seconds after IGN ON, replace the vacuum pump.

▶ Go to Step 2).

(2) Is the brake warning lamp ON within 45 ~ 55 seconds?

▶ Brake vacuum switch is normal condition.

▶ Go to Step 3).

(3) Is the brake warning lamp ON within 15 ~ 35 seconds after removing the vacuum hose from the brake booster?

▶ Replace the vacuum pump.

▶ Vacuum pump is normal condition.


Removal
Brake Booster 1. Turn ignition switch OFF and disconnect the negative (-) battery cable. 2. Remove the air duct (B) and air cleaner assembly (A). ...

Installation
Brake Booster 1. Installation is the reverse of removal. • Before ins ...

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