I personally haven't heard of damage occurring by having all your keys etc hanging off your car key, but no doubt there will be someone out there who has reported such. I used to have a bunch of keys for numerous things hanging off my car key (about 15 different keys in total) and the ignition tumbler never changed in it's feel. I'm sure there would be a weight limit as after all it is extra stress, but for your average bunch of keys and keyrings, you should be fine. Get something that weight 400g and you will notice that you would have to have a fair few keys etc to reach that weight. Most car's I have come across, the ABS light is only there as a system self-check light and a malfunction indicator. It should only light under the following conditions: 1) When you start the car. It should turn on for a few seconds or so then turn off. This indicates everything is okay. 2) When there is a problem with the system. The light should illuminate and stay on to tell you that something is wrong and you should have it checked out. thanks for the reply. reason why i asked question 1 is that since i have put in ES engine mounts, there was a certain vibration at 3 to 4k rpm. found out that it was the key in the igition and solved the problem by just having a bit of extra weight with the car keys. now for the other 2 or 3 vibrations coming else in the car lol.... <_< SOFT ..... *meow*