Hard Brake Pedal Diagnosis - Toyota Corolla 2019
The brake pedal is consistently hard, indicating a potential issue with the brake booster, vacuum supply, or master cylinder. This reduces braking assist and increases stopping distance.
Diagnosis Details
Possible Causes
Failed brake booster - internal diaphragm leak or mechanical failure
Vacuum hose leak or blockage - hose disconnected, cracked, or clogged
Faulty check valve in vacuum line - allows vacuum loss
Master cylinder internal failure - piston seal or bore issue
Related OBD-II Codes
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What You Should Do
Inspect brake booster vacuum hose for cracks or disconnection.
Check check valve operation.
Test brake booster function by pumping pedal with engine off, then starting engine to see if pedal drops.
If no change, replace brake booster.
Also check for vacuum leaks at intake manifold.
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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.
