Disc & Drum: Other Kia Spectra I рестайлинг

PRECAUTION BEFORE REPAIRING

1. To prevent damage to the system, follow procedures below before repair or diagnosis. Disconnect or connect each component (ABS CU, HCU assembly, etc.) with ignition switch off. For failure of components which is not specified for repair, replace those as assembly. When using an electric arc welding machine, disconnect each component (ABS CU, HCU assembly).
2. Do not spill brake fluid on painted surfaces, wiring, cables or connectors. If fluids damage painted surfaces or connectors, remove using a mop and water.

Scheme 38

HYDRAULIC BRAKE SYSTEM

The hydraulic brake system uses principles of fluid power to apply the front and rear brakes. The system operates as follows

1. The brake pedal is connected to a hydraulic servo called the master cylinder.
2. When the pedal is pushed, fluid is forced from the master cylinder through metal tubing and flexible hoses to rear brake calipers and front disc brake calipers.
3. Wheel cylinders are hydraulic actuators which convert hydraulic pressure produced in the master cylinder into motion.
4. The front and rear brake caliper pistons move inward forcing the brake pads to make contact with metal surface of the brake rotor.
5. When the brake pedal is released, pressure in the system is relieved. Brake shoes and pistons then return to their neutral or released position.

If brake fluid is lost from one or both circuits, a fluid level sensor in the master cylinder illuminates an indicator lamp in the instrument cluster. The lamp comes on when a float in the master cylinder drops below a specified level and closes a circuit. Once the circuit is closed, the lamp will illuminate and remain ON whenever ignition switch is in ON or START position. If the lamp is ON, make sure parking brake is in the fully released position. The lamp also indicates when the brake fluid level is low and when the parking brake has been applied.

Scheme 39

AIR BLEEDING (CBS)

After finishing repair on a hydraulic line (removing brake pipe), bleed air out of the line. Refer to the following

Scheme 40

Scheme 41

1. When bleeding air from lines, keep fluid level in reservoir to Max position.
2. Bleed air in the following order: Right front wheel, Left front wheel, Right rear wheel, Left rear wheel
3. During air bleeding, depress brake pedal at least ten times. Keep the pedal depressed for three seconds to fill the master cylinder.
4. To avoid brake fluids from spouting, install the cap of the reserve tank prior to air bleeding.
5. Keep vehicle level.

Scheme 42

Scheme 43

1. Jack up vehicle and support it with safety stands. CAUTION: Brake fluid reservoir must be 3/4 full during air bleeding.
2. Remove bleeder cap and attach a vinyl hose to bleeder plug.
3. Place other end of vinyl tube in a clear container.
4. Depress brake pedal a few times, and then hold it in depressed position.
5. Have a second person loosen the bleeder screw, drain out fluid, and retighten screw with SST (OK130 430 019). Tightening torque: 4.3~6.5 lb.ft (5.9~8.8 N.m, 0.6~0.9 kg.m) CAUTION: Both people should stay in voice contact with each other. Be sure pedal remains depressed until air bleed screw is tightened.
6. Repeat steps 4 and 5 until no air bubbles are seen.
7. Check for correct brake operation.
8. Verify that there is no fluid leakage. Clean away any spilled fluid with rags.
9. After air bleeding, add brake fluid to reservoir to specified level. NOTE: Air bleeding must be done from bleeder screw that is farthest from the master cylinder.

STEP 3

1. Start engine
2. Depress pedal with usual force.
3. Stop engine.
4. Hold pedal down for about 30 seconds.
5. If pedal height does not change, unit is operating.
6. If there is a problem, inspect check valve or vacuum hose for damage, and check connection. Repair if necessary, and recheck.

If nature of problem is still not found, follow more detailed inspection described in "method using tester," below.

Scheme 44

CHECKING FOR VACUUM LOSS

(Method using tester)

Connect a pressure gauge, vacuum gauge and pedal depression force gauge as shown in figure below. After bleeding air from pressure gauge, conduct test as described in following steps.

Note. Use commercially available gauges and pedal depression force gauge.

Scheme 45

Scheme 46

1. Start engine.
2. Stop engine when vacuum gauge reading reaches 19.7 inHg (500 mmHg).
3. Observe vacuum gauge for 15 seconds. If gauge shows 18.7-19.7 inHg (475-500 mmHg), unit is operating.

Scheme 47

1. Start engine.
2. Depress brake pedal with a force of 44 lb.ft (196 N.m, 20 kg.m).
3. With brake pedal depressed, stop engine when vacuum gauge reaches 19.7 inHg (500 mmHg).
4. Observe vacuum gauge for 15 seconds. If gauge shows 18.7-19.7 inHg (475-500 mmHg), unit is operating.

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Scheme 51

1. If fluid pressure is within specification (vacuum 0 mmHg) when engine is off, the unit is operating properly.
2. Start engine. Depress brake pedal when vacuum reaches 19.7 inHg (500 mmHg). If fluid pressure is within specification, unit is operating.