Detailed Inspection B Of Vehicle: Notes
Verify the malfunction symptom according to the following table and perform the applicable troubleshooting procedure.
DETAILED INSPECTION B OF VEHICLE (CONVENTIONAL BRAKE SYSTEM) TROUBLESHOOTING REFERENCE
| Primary cause | Secondary cause | Tertiary cause | Related part | Reference/measure | |
|---|---|---|---|---|---|
| Vehicle malfunction | Brake fluid pressure has difficulty increasing | External leakage of brake fluid | Leakage from engagement area Leakage due to part damage | Brake pipe Master cylinder Brake caliper Wheel cylinder Pipe joint Brake hose | (See. INSPECTION ITEM 1 .) |
| Brake fluid internal leakage | Swelling of seal area of master cylinder due to mixing of different liquid | Master cylinder | (See INSPECTION ITEM 2 .) | ||
| Damage to solenoid valve area due to mixing of different liquid | ABS HU/Control Module, DSC HU/Control Module | ||||
| Damage to seal area and foreign matter caught in seal | Master cylinder | ||||
| Foreign matter caught in solenoid valve | ABS HU/Control Module, DSC HU/Control Module | ||||
| Solenoid valve opens due to malfunctioning operation | ABS HU/Control Module, DSC HU/Control Module | (See. INSPECTION ITEM 3 .) | |||
| Trapped air | Insufficient brake fluid | Reserve tank | (See. INSPECTION ITEM 4 .) | ||
| Air entering brake fluid pressure line | Brake fluid pressure line | (See. INSPECTION ITEM 5 .) | |||
| Vapor lock | Braking performed under heavy load | - | (See. INSPECTION ITEM 6 .) | ||
| Brake drag | Parking brake lever Parking brake cable Brake caliper | ||||
| Large stroke loss | Excessive piston return | Adjuster malfunction | Brake caliper Wheel cylinder | (See. INSPECTION ITEM 7 .) | |
| Maintenance mistake (occurs only during initial braking after piston retraction due to disk pad replacement) | Brake caliper Wheel cylinder | (See. INSPECTION ITEM 8 .) | |||
| Input (road surface/steering) to brake components is excessive | Brake caliper Wheel cylinder Hub bearing | (See. INSPECTION ITEM 9 .) | |||
| (See. INSPECTION ITEM 10 .) | |||||
| Excessive ABS intervention | ABS HU/Control Module, DSC HU/Control Module control malfunction | ABS HU/Control Module, DSC HU/Control Module, ABS wheel speed sensor, ABS sensor rotor | (See. INSPECTION ITEM 11 .) | ||
| Vehicle is normal | Customer mis-operation | Failure to depress brake pedal | Failure to depress brake pedal | - | (See. INSPECTION ITEM 12 .) |
| Accelerator pedal was depressed | - | (See. INSPECTION ITEM 13 .) | |||
| Operation of brake assist mechanism * Normal operation. At this time, braking force is applied. | Operation of brake assist mechanism | Power brake unit (mechanical brake assist), DSC HU/Control Module (electrical brake assist) | (See. INSPECTION ITEM 14 .) | ||
| Smart brake support (SBS) operation * Normal operation. At this time, braking force is applied. | Smart brake support (SBS) operation | DSC HU/Control Module | (See. INSPECTION ITEM 15 .) | ||
| Operation of electric parking brake while driving * Normal operation. At this time, braking force is applied. | Operation of electric parking brake while driving | DSC HU/Control Module | (See. INSPECTION ITEM 16 .) | ||
| Brake pedal sink due to negative pressure fluctuation * Normal operation. At this time, braking force is applied. | Brake pedal sink due to negative pressure fluctuation | Brake pedal sink due to negative pressure fluctuation | Power brake unit, engine system | (See. INSPECTION ITEM 17 .) | |
| Other | - | Verification difficult Explain to the customer that there is no malfunction indicated in the vehicle inspection results | |||