I killed mine as well a long time ago on my ES.
I bought a set of hella triple air horns with a compressor.
Another thought is to get just the smaller replacement ones from hella which are simpler to install.
I know nothing when it comes to molecular chemistry but from all the info i have read they say that Nitrogen is larger than most of the composition of compressed air.
My noticeable changes would be also from me running 50 psi on 20 inch rims compared to a more normal 35psi . So the stiffer sidewall pressure would cause me to hear more noise being echoed through the tires.
I am not sure how this would effect a regular sized rim and tire.
It is impossible for 5X100 bolt pattern to fit an ES300.
If the rims have dual 5X100 and 5X114.3 then it would.
How do you know/think they are 5X100?
The wheels some in a dual pattern of either 4 or 5 bolt in the ranges above which is why it would fit.
Actually i was talking about the bearing inside the diff holding the axles. If the axle seals leak it is only from the bearing being shot and expanding the gap behind it allowing the fluid to leak past the strached seal and worn bearing.
From the page it mentioned that it has a transformer. I think all it really has is a few load resisters inside to balance the current and keep the warning off.
It is not the brake pedal switch , The design of the indicator is so it can tell when there is a different current draw from lite brake lights . Otherwise how could it tell when one is burnt?
Just buy a new set of rotors it is relatively cheap for aftermarket ones.
The rear rotors diameter is smaller but it has a larger hub to hold the parking brake . While the front one is larger diameter as it does most of the braking.
Just get an aftermarket alarm and you will also be able to start your car and open your trunk as well . The best part would be you will no longer have to be 5 feet from the door to open it.
Since you are handy i would spend $10 or so and download the full Lexus manual from Toyota online.
I can't remember the link to get it from there site though.
As i presumed your alignment angles are getting beyond the stock ones and has caused bearing damage which has lead to a broken seal as well.
Re build the axle and find out exactly why that corner is getting out of whack so much.