Dont grease your brakes - it will remedy the tick noise by replacing it with the sound of you screaming in panic when you find you have no brakes
The tick noise is probably from wear in the sliding surfaces, when the ABS brakes pulst the runout in the sliding surfaces of the brake pad is basically rattling - you need to have a brake shop look at them because most ABS systems use an accumulator and you could cause damage to you or your vehicle if you try to tackle it yourself... gone are the days of tinkering under the hoods
or bonnets of our own vehicles - unless you are into vintage ones...
If you can not find a shop to properly service your brakes, just replace the horn with one that is louder!