Brake problems: what is safe to check and what is not
Brakes are the one system where caution beats curiosity. Looking and listening is fine. Dismantling, bleeding or adjusting brakes is professional work, and a mistake is not recoverable at the roadside.
Use this page to understand what your symptom suggests, then get it inspected.
Common symptoms
- Grinding or scraping when you brake
- A soft or spongy pedal, or one that sinks slowly
- The car pulling to one side under braking
- Vibration through the pedal or steering wheel when slowing
- A brake warning light, or a low brake fluid level
- A squeal that comes and goes with weather or temperature
Simple checks you can do safely
- 1
Check the brake fluid level
Engine off, car level. A level below minimum needs professional attention — fluid does not simply evaporate.
- 2
Look through the wheels
Without removing anything, you can often see how much friction material remains and whether a disc has a heavy lip or deep scoring.
- 3
Note when the symptom happens
Only when cold, only at speed, only under heavy braking, or all the time. Vibration only when slowing from speed points somewhere different to a constant grinding.
- 4
Look for fluid on the inside of a wheel
Wet, oily residue on the inner wheel face or a damp patch on the ground behind a wheel is a stop-driving finding.
- 5
Do not attempt repairs on a jack
Never work under a vehicle supported only by a jack, and never take a brake apart to "have a look".
Do not buy or replace parts until the fault is confirmed, and never work under a vehicle supported only by a jack.
Warning signs: do not drive
- Braking feels weak or the pedal goes towards the floor
- There is loud, constant grinding when you brake
- Brake fluid is leaking or the level keeps dropping
- A brake warning light appears together with reduced braking — arrange inspection or recovery
Common questions
Why are my brakes grinding?
Constant grinding commonly indicates friction material that has worn through, though a stone or corrosion can also cause it. Either way it needs inspecting promptly, and loud constant grinding with reduced braking means stop driving.
Why is my brake pedal soft or spongy?
A soft pedal or one that sinks is associated with air or a leak in the hydraulic system. This is a stop-driving symptom — arrange a professional inspection or recovery rather than continuing.
Why does my car vibrate when I brake?
Vibration through the pedal or steering when slowing from speed is usually related to the discs or their mounting surfaces. It is worth inspecting, but it is not the same urgency as weak braking.
Can I check my own brakes?
You can check the fluid level and look through the wheels at the discs and pads. Do not dismantle brakes, and never work under a vehicle supported only by a jack.
These describe what a symptom commonly suggests. They are not a confirmed diagnosis of your vehicle.
Related guides
Still not sure what's wrong?
Describe the symptoms, add photos, video or an engine sound, and work through the likely causes with the checks that separate them.
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