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All Symptoms

Brake pedal feels stiff or hard to press

Serious - act right away

hard brake pedal · brakes require a lot of force

Symptom description

The brake pedal feels unusually stiff, hard or heavy to press down, requiring much more force than usual to slow the car.

Common causes

  • A failed brake booster (the most common cause)
  • A faulty check valve on the brake booster hose
  • A vacuum leak affecting the booster (on non-electric-boosted cars)

What to check

Listen for a hissing sound from the engine bay when pressing the brake pedal with the engine off then on - a change can point to a booster or vacuum issue.

Can you keep driving?

Not recommended. A failed brake booster means you can still stop the car, but it takes significantly more pedal force, which is dangerous in an emergency.

Ask AI for more specific detail

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Find a repair shop

Run a shop? The OBD decoder, fuse box diagrams and parts catalog are built into the Motoro dashboard. See Motoro for workshops

Descriptions are for guidance only and do not replace a workshop inspection. If you are ever unsure whether it is safe to keep driving, pull over in a safe spot.

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