Hard Brake Pedal Diagnosis - 2020 Chevrolet Silverado 1500
A consistently hard brake pedal indicates a loss of power brake assist, likely due to a failed vacuum booster, vacuum leak, or faulty check valve. This significantly increases stopping distance and poses a safety risk.
Diagnosis Details
Possible Causes
Failed brake booster (vacuum leak or diaphragm rupture)
Faulty brake booster check valve or vacuum hose leak
Malfunctioning vacuum pump (on diesel engines) or restricted vacuum source
Related OBD-II Codes
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What You Should Do
Do not drive the vehicle until repaired.
Check vacuum hose and check valve for cracks or leaks.
Test brake booster operation by pumping brake pedal with engine off, then start engine; pedal should drop slightly.
If not, replace booster.
Inspect vacuum pump if equipped with diesel engine.
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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.
