Hate to say it, but you may be just beginning your odyssey with 100 series LC breaking systems. These are highly sophisticated ABS systems and consist of several very expensive components (accumulator, ECU, mc and a couple others).
The screeching is likely coming from the accumulator motor. The brushes have likely worn down to failure point and the dust they produce gets inside the electric motor and causes screeching as the tolerances on the shaft widen. I spoke with a couple specialty shops and they indicated that while you can continue to drive the truck, screeching and all, if you ever have to go into a mode where ABS is initiated it is likely you will not be able to unlock the brakes without having it towed back to a shop. In other words once the ABS starts to fail you could find yourself in a situation with a fairly catastrophic lock up. That said, my son and I drove my truck 1400 miles before I got it back into the shop for the replacement of the entire MC/ECU system.
I'm usually pretty adventuresome when it comes to working on these trucks. When I looked at doing it myself I realized that this was one of those things that was beyond my expertise. Nor did I have the time to figure it all out. In addition there are some specialty tools required to bleed the brakes and balance the ECU/ABS once the job is complete. Knowing what I know now I might consider tackling it. But last summer we just didn't have that option. Knowing what I know now I might consider tackling it. But last summer we just didn't have that option
I am sad to say that I could not find any rebuilt systems and I ended up spending around $2100 on a new system (note the MC/ABS systems are specific to the MONTH the truck was produced and you need to work closely with Toyota to get the proper assembly for your vehicle). Toyota is pretty good about giving a Land Cruiser association discount if you ask for it.
With shop time and fluids I ended up spending about $3400 on this job. That included all of the installation plus new fluid, complete system fluid flush and new bleeders. Of course I live in the bay area on the West Coast and that seems to be an excuse for overcharging for just about everything. You could probably be able to get a better deal outside major metropolitan areas.
I also did a new timing belt, fan, fan clutch, radiator, tensioners, and pulleys along with new hoses right around the same time last year. It was an expensive summer, but since my truck only had 140,000 miles on it and it was a year 2000 I felt that the investment would be worth it. I love the thing and will probably keep it till I die.
