Symptom
The brake lights do not come on when the pedal is pressed — and the driver has no way of noticing.
That is what makes this dangerous out of proportion to its cost. You cannot see your own brake lights, so the first sign is usually being hit from behind or being told by another driver. It is also an immediate roadworthiness failure everywhere.
The brake light switch is the commonest cause and one of the cheapest parts on the car. It sits on the pedal arm against a striker, so it fails by wearing out, by falling out of adjustment, or because the small rubber pedal stop behind it has perished and dropped out — which lets the switch sit in the wrong position.
A useful clue that points at the switch rather than the bulbs: the same switch usually cancels cruise control and releases the gear selector from Park. Brake lights out plus cruise control that will not set is the switch, near enough always.
Bulbs and holders are the other half. Check all of them including the high-level lamp, and look for green corrosion in the holder. On LED units the whole cluster is usually the part.
Verify by having someone stand behind the car while you press the pedal. It takes a minute.
Also described as: brake lights out, stop lamps not working, no brake lights, brake light bulb, rear brake lights not coming on, چراغ ترمز کار نمیکند, چراغ ترمز روشن نمیشود, luces freno no funcionan, no encienden luces freno, luz freno fundida, أنوار الفرامل لا تعمل, لمبات الستوب معطلة, إشارة الفرامل ما تنور
The brake lights do not come on when the pedal is pressed — and the driver has no way of noticing. That is what makes this dangerous out of proportion to its cost: you cannot see your own brake lights, so the first sign is usually being hit from behind or being told by another driver. It is also an immediate roadworthiness failure everywhere.
The brake light switch is the commonest cause and one of the cheapest parts on the car. It sits on the pedal arm against a striker, so it fails by wearing out, by falling out of adjustment, or because the small rubber pedal stop behind it has perished and dropped out — which lets the switch sit in the wrong position.
A useful clue that points at the switch rather than the bulbs: the same switch usually cancels cruise control and releases the gear selector from Park. Brake lights out plus cruise control that will not set is the switch, near enough always.
Bulbs and holders are the other half. Check all of them including the high-level lamp, and look for green corrosion in the holder. On LED units the whole cluster is usually the part.
Verify by having someone stand behind the car while you press the pedal. It takes a minute — and it is the only way to know, which is the entire point of this entry.
| What you find | Likely cause | How to confirm it | What fixes it |
|---|---|---|---|
| No brake lights, and cruise control will not set | The brake light switch — near enough always, given that combination | The two symptoms together are the diagnosis. Check the selector will not leave Park either on an automatic. | Renew and adjust the switch, and fit the rubber pedal stop if it has perished away. |
| One lamp out, others working | That bulb or its holder — green corrosion is common | Have somebody watch each lamp while the pedal is pressed. This takes a minute and settles it. | Renew the bulb and clean or renew the holder. |
| All out including the high-level lamp | The switch, the fuse, or the circuit rather than the bulbs | All lamps failing together rules out bulbs. Check the fuse and the switch's output. | Repair the switch or the circuit and find why the fuse failed. |
| Brake lights work but the high-level lamp does not | That unit — often an LED strip that is a single part | Check it deliberately; it is the one nobody looks at and it is a test failure in most jurisdictions. | Renew the high-level unit. |
| Lights come on erratically or with the pedal barely touched | Switch adjustment — the plunger is not resting where it should against the striker | Watch the lights while pressing gently. Correct operation begins a few millimetres into travel. | Adjust or renew the switch and fit the pedal stop. |
| Not checked recently | Nothing yet — this is the check itself | Have somebody stand behind while you press the pedal. There is no other way to know, and it takes a minute. | No repair. Do it periodically; the failure is silent by nature. |
No brake lights, and cruise control will not set
One lamp out, others working
All out including the high-level lamp
Brake lights work but the high-level lamp does not
Lights come on erratically or with the pedal barely touched
Not checked recently
Listed with the codes that most typically present this way first — the likeliest place to start.
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Car lighting is the one system where you cannot see your own failure. Every other fault announces itself to the driver; a dead brake light announces itself only to the person behin...
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