Soft Brake Pedal During Hard Braking
The brake pedal feels soft or spongy when applying hard braking, indicating a potential issue with the brake hydraulic system, such as air in the lines, fluid leak, or master cylinder failure. This condition significantly reduces braking performance and poses a safety risk.
Diagnosis Details
Possible Causes
Air in the brake fluid (contaminated or low fluid level)
Brake fluid leak (from caliper, line, or master cylinder)
Faulty brake master cylinder (internal bypass or worn seals)
Related OBD-II Codes
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What You Should Do
Do not drive the vehicle.
Have it towed to a qualified mechanic.
Inspect brake fluid level and condition, check for leaks at all calipers and lines, and bleed the brake system.
If the master cylinder is faulty, it must be replaced.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.