Kia Optima: Brake System / Brake System

Kia Optima DL3 2019-2021 Service and Repair Manual / Brake System / Brake System

Repair procedures
Operation and Leakage Check

Check all of the following items:

Component
Procedure
Brake Booster (A)
Check brake operation by applying the brakes during a test drive. If the brakes do not work properly, check the brake booster. Replace the brake booster as an assembly if it does not work properly or if there are signs of leakage.
Piston cup and pressure
cup inspection (B)
• Check brake operation by applying the brakes. Look for damage or signs of fluid leakage. Replace the master cylinder as an assembly if the pedal does not work properly or if there is damage or signs of fluid leakage.
• Check for a difference in brake pedal stroke between quick and slow brake applications. Replace the master cylinder if there is a difference in pedal stroke.
Brake hoses (C)
Look for damage or signs of fluid leakage. Replace the brake hose with a new one if it is damaged or leaking.
Caliper piston seal and
piston boots (D)
Check brake operation by applying the brakes.
Look for damage or signs of fluid leakage. If the pedal does not work properly, the brakes drag, or there is damage or signs of fluid leakage, disassemble and inspect the brake caliper. Replace the boots and seals with new ones whenever the brake caliper is disassembled.

Brake System
Service data Service Data Service data Item Specification Master cylinder Cylinder I.D. Ø 22.22 mm (0.874 ...

Brake Booster
Components and components location Components 1. Reservoir cap 2. Reservoir 3. Master cylinder 4. Brake fluid level sensor 5. Vacuum sensor 6. Brake ...

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