What does it mean when the brake light and battery light come on?

Asked By: Amit Clavo | Last Updated: 22nd June, 2020
Category: automotive auto parts
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The battery light will come on when the event that the battery is no longer being charged. The 'E' brake (parking brake) light comes on when the fluid is low in the master cylinder or there is a pressure difference in the brake system. Have the alternator checked and see if the battery cables are tight.

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Considering this, why would battery light and brake light come on at same time?

Incidentally, the battery and brake lights are the same lights that come on when the key is turned on and the engine isn't running, which would indicate an alternator problem, as the alternator isn't turning at this point.

Furthermore, what does it mean when your brake lamp is on? Normally it means that the handbrake is on or not released fully. If the light is on while driving check the handbrake is fully off. If on the other hand if the lamp is still on when the handbrake is fully released then you MUST take action, this warning brake lamp/light could mean that the brake fluid is low.

Keeping this in consideration, what is wrong when battery light comes on?

The battery light indicates a battery charging problem. If the battery light comes on and stays on while you are driving, the most common cause is a broken alternator belt. Total failure of the alternator is another possibility.

Why is my abs and battery light on?

When the battery is very weak, this may inadvertently cause other warning lights to come on, such as the ABS light as a result of low battery voltage. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power.

30 Related Question Answers Found

What are the symptoms of a bad alternator?

6 Symptoms of a Failing Alternator
  • The indicator light.
  • Headlights are dim or flickering.
  • Other electrical failures.
  • Strange noises.
  • Car stalls or has difficulty starting.
  • Battery dies.

How do know if your alternator is bad?

Six Alternator Warning Signs:
  1. Dim lights. The alternator is part of the electrical system of your vehicle.
  2. Warning light. Most modern cars have a dashboard warning light that alerts you when the alternator is on the fritz.
  3. Weak or dead battery.
  4. Weird smells.
  5. Odd sounds.
  6. Visual cues.

How does it cost to replace an alternator?

Waits says the average price to replace an alternator with a remanufactured one is $400, while Gunning adds that a remanufactured alternator on a typical, domestic car, costs about $300 to $500, including parts and labor. The price of a new alternator can run from $500 to $1,000.

Why does brake light come on while driving?

Your brake light could come on while you are driving for several reasons. In other cases, the problem is low brake fluid in the master cylinder, either because it hasn't been topped off in a while or because there is a leak in the brake line. Your brake light may also come on if you need new brake pads.

Can you drive with a bad alternator?


When an alternator is going bad, the battery drains quickly. If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for a replacement alternator.

How can I test my alternator?

To check an alternator, pop your vehicle's hood and hook up a voltmeter to the car's battery by connecting the red lead to the positive terminal and the black lead to the negative terminal. Make sure the voltmeter reads at least 12.2 volts, then start your car and rev the engine to 2,000 RPM.

How do you add brake fluid?

Remove the cap - Remove the cap by pulling it straight up, unscrewing it, or releasing the metal spring clip, whichever is applicable. Add brake fluid to the reservoir - Slowly add brake fluid to the reservoir until it's at the desired level. Be sure to use the correct brake fluid for your car.

How do you know if its a battery or alternator?

Signs of a Bad Alternator
Some of the things to look for are no-starting and trouble starting, dimming lights and problems with stereo system output. If your car starts but stalls when you're underway, your battery is probably not being recharged due to a faulty alternator.

When I turn on AC battery light comes on?

The battery light is likely just an indication of the alternator not working from the idle being too low. The dealer should be able to diagnose it very quickly and it should be covered. Check the charging system when the car is running. Should have 14 volts when the engine is running.

Does the battery light come on when the alternator is bad?


But if you have a bad alternator, then it won't be able to keep the battery charged. This will cause the car battery light to illuminate once there is an inconsistency in the charge. Once the alternator completely dies, the power that is left in the battery will be exhausted in a matter of minutes.

Can you drive with battery light on?

Driving with your Battery Light on is not a good idea. If the battery is bad, the alternator is faulty, or the wiring is bad, these can cause the vehicle to lose power and not operate like it normally would. The battery powers essential parts of your car, so it is a must have piece of equipment.

What does a battery light mean?

CARS.COM — If the battery warning light (a light in the shape of a battery symbol) on the dashboard comes on while you're driving, that means the charging system isn't working, but the fault may lie in something other than the battery. The alternator generates the power that is stored in the battery.

Can a bad fuse cause the battery light to come on?

Each vehicle comes with a battery light on the dashboard. This light works as a warning in case the battery has a problem. It could be a damaged alternator, corroded wires, fuses, or the battery itself. In such a case, the battery light will then go on.

How much does it cost to fix a alternator belt?

The replacement cost of an alternator belt is typically between $100 and $200. The part cost is between $25 and $80 while the labor cost is between $75 and $120.

What are the signs of a bad battery?


Watch for these five telltale signs of a bad battery so you aren't caught out in the cold!
  • Dim headlights.
  • Clicking sound when you turn the key.
  • Slow crank.
  • Needing to press on the gas pedal to start.
  • Backfiring.

How do I check my brake fluid?

To check your brake fluid, do the following:
  1. Clean the top of the reservoir carefully.
  2. Open the top of your brake fluid reservoir.
  3. Look to see where the fluid level lies; make sure that the brake fluid level is within half an inch or so of the cap.
  4. Check the color of your brake fluid.

How do you fix a brake light switch?

How to Replace a Brake Light Switch
  1. Open the driver door of the car and kneel down inside so that you can see and reach the underside of the dash, where the pedals connect.
  2. Remove the two or four Phillips-head screws that are behind the brake pedal and that hold the electrical cover in place.
  3. Remove the cover.