Check engine light most of the time (not all the time) means there's an air/gas mixture problem, should not cost much to fix.
Not sure what you mean by rotors, but the engine light will not warn of brake wear. Engine light only comes on for service warning or beacuse af an engine fault. Hope this helps
SOURCE: PULSATION WHEN APPLY BRAKES
Even though you replaced the rotors, seems that you will still need to have them resurfaced. This assuming you are experiencing pulsation only when braking.
Hope this helps, Please remember to rate this answer.
SOURCE: 2004 Mini CooperS- brake service light stays on
Did they replace the brake pad wear sensor? If so, try leaving the key in the on postion for 30-45 seconds (dont start the car) This is how we reset the lights on BMW's and the Mini's use a similar system for service lights
SOURCE: 2006 grand caravan abs and brake light on and off
If the ABS lite is comming on, the module is detecting a problem in that system. There will most likely be a code in the computer. take it to your dealer and have it check. The most common problem i see in these is a failed speed sensor.
SOURCE: pulsating and vibrating brakes on 2003 chevy express, new pads and rotors
Rust build up is commonly found on the hubs sandwiched by the rotors/hubs
SOURCE: Brake pad wear indicator light
Did you change the sensor? if you did, do a battery reset (disconnect for 10 to 20 min.).
Obviously the wear sensor has made contact with the rotor and is already
damaged. You're not even suppose to resuse the wear pad sensor if its
worn or damaged anyways.The way how the sensor works is that it must
make contact to the rotor to complete the wear pad light indicator
circuit. There is no mentioning that he replaced the the wear pad sensor with a new one.
But if one did replaced the wear pad sensor and the wear pad indicator
is lit up, the way to reset it is to leave the key on in ignition switch
#2 or #1 for about 30sec. turn it off and its reset.
Its possible that you forgot to replace the brake light sensors. They are about 15 bucks,
and have to be replaced in order for that light to turn off. You can either get them from the dealer where they'll likely charge you 3 times as much, or you can go to http://www.turnermotorsport.com and get them there.
You have to reset the light by leaving the ignition switch on position
#2 for about 30 sec. turn off the ignition and start the engine up and
see if it goes out. I recommend buying a new wear pad sensor as well because now light will lit up when you're way below spec (less than 3mm)
Also, you could try with this procedure for one E39: Turning off the Check Brake Linings warning on the Instrument Cluster...
- so you've just changed the brake pads on your E39, along with the
wear sensors. The old sensor(s) needed replacement cause you waited a
bit too long before changing the pads, and wore through the sensor(s),
turning on the BRAKE light on the dash. But wait, the light is still on?
But there's a new sensor installed... what gives?!
- there is a procedure required in order to turn off the light/warning.
With the ignition off, step on and hold the brake pedal. Now, while
holding the brake pedal down, turn on the ignition switch to position 2
(just before cranking). Hold the brake pedal until the BRAKE light is
off. Tada, the warning is gone and reset.
NOTE: This procedure worked on a 2001 E46 325i. It took about 15-20 seconds, but it cleared out w/o having to unhook the battery.
Other details find in the Owners Manual 2006-BMW-Z4m-Roadster-Owner-Manual
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