Question about 1999 BMW 318 ti

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BRAKE WARNING LIGHT

HI
IVE JUST HAD MY REAR PADS CHANGED ON MY 318i BMW
BECAUSE THE WARNING LIGHT HAD COME ON,AFTER CHANGING THE REAR PADS THE WARNING LIGHT IS STILL ON CAN YOU HELP IT MAY BE ELECTRICAL??

STEVE

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Its not an electrical problem . . .. . When you change brakes you have to change the brake sensor as well. . . . . It just looks like a piece of wire with a sensor that clips onto the pad . . . . .Normally it is the outerpad. . . I cant tell you on witch sides its on cause it may differ from model to model.

Its not going to be a hazardous to the car the brake light will just keep burning.

If you replace the sensor and t he light does not stop burning it may be that your front brakes are also worn but remember just as at the back there is a sensor at the front.

Posted on Jun 26, 2008

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SOURCE: BRAKE WARNING LIGHT

There is a sensor that is in pad that tells when pads are done, unfortunately but the time the sensor tell you that you need brakes, the sensor is all-ready damaged and needs to be replace with pads. More than likely the pad were replace and NOT the sensors. Change sensors and fix the problem. If fixed ya leave me a FIX-YA comment. Thanks

Posted on Dec 19, 2008

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A light in the dashboard turns on today and I have no idea what is the symbol for? is like a circle with 3 rectangles in line on each side this is a BMW 318i, 1996


This is the brake wear indicator. When the brake pads get too thin, this sensor, which is mounted in the brake pad backing on the front left wheel and the rear right wheel, touches the rotor and wears through, grounding out the contacts and illuminating the light.
Once the light is lit, you will need to buy a new sensor as well as new brake pads. The sensor is not expensive.
First step is to examine the brake pads and determine if you need front pads or rear pads or both. Don't be surprised if you need new rotors as well as pads. Check for a significant lip at the outer edge of the rotor. If the pads have worn in the sides of the rotor more than about 1/16", you are due for rotors.
You cannot go wrong with BMW branded pads. They are safe and work great, but they are really dirty. If you want to try other brands, read the reviews. Some squeak and some fade.
I use Mexican made Brembo rotors. They work well but they rust quickly, so the brakes squeak a bit the first time you press them after washing the car or driving in the rain. More expensive rotors or BMW branded rotors don't rust so much, but they cost a lot more and don't necessarily last any longer.
After replacing the pads, turn the key to the On position and leave it on for about 90 seconds before starting the car to reset the brake pad warning light.

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The light can also illuminate if something damages the wire to the sensor. I usually replace my pads before they get down to the sensors, so I re-use my old sensors. Although the wires are fairly well secured to the suspension, after a few years, the wires can get chaffed from the wind blowing them around, and the damaged wire can turn on the warning light.

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How to reset brake light after changing pads.


Hi Peters6709,
Sorry to tell you, but you need to replace the pad-wear sensors as well. They are the little trapezoid pieces that hang inside the tops of the inside pads. They should run about $10 each. Once replaced, disconnect the battery completely for about 10 minutes, if you have a stock radio keep the code handy.

Next time check the pads every 10-12K miles. I have been running the SAME pad wear sensors on my Z3 for the past 2 pad changes now after making the same mistake the first time.

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I dunno if this will work on your BMW, but on my BMW Z3 and M3, it was....

Turn the ignition key to position 2, but do NOT start the car. Wait for about 45 seconds and the brake warning message will be reset.

If it doesn't reset, then the brake sensor was damage. You will need to replace the brake sensor. It sounds like you replace the brake right after you saw the warning, so the brake sensor should be okay.

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Redmondeo34


A couple of things to check.
This is only if you replaced the front pads, after the warning light came on.
1. Make sure brake fluid is level and at the max mark
2. Did you replace the front pads sensors with the new pads.If not please do.
3. Check that the rear pads and sensors are not worn and do not require replacing.
4. If all above is good, Drive vehicle for about 5klm and switch off and on it will reset itself

regards
I hope this helps.

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