Howstern401

91 400LS. Am still experiencing same Brake issue. After replacing right front Caliper and both front rotors, new pads, things worked fine for about 1000 miles. After that period, the front wheel with the new caliper would start heating up, i.e. braking. This would happen every now and then until all 4 wheels would start braking fairly hard (all 4 wheels showing same amount of heat) without Pedal input. Opening Bleed valve depressurized system and confirmed on Hoist. Also, letting the car sit for 10 - 20 minutes will free them up. Disabled the ABS, bled the system, same still. Rubber brake lines replaced years ago with the braided steel type. Am certain no cross contamination of bona fide brake fluid ever took place. Talked with the Lexus Tech to no avail. Anybody else found the cause/fix for this? Thank's all.

Replaced front rotors, calipers, Pads. After a few days driving all 4 wheels would brake about equally hard, judging by the heat generated all around and also confirmed up on a Hoist. After some time goes by they would sometimes release, sometimes not. Other times tap the Brakes a few times and they would release - for a while. No warning lights, no codes thrown, no codes in memory. ABS gone south?

I had a similar issue with my rear brakes. We replaced all 4 lines and checked all 4 caleper and replaced one - and fully replaced all the brake fluid. Didn't help at all.

Took it to my trusted mechanic who started with releasing pressure at the MC freed the brakes, so we replaced the MC - twice. Ran good a week or so...and she started locking up all 4 wheels.

All 4!!

We've eliminated the booster, brake lines, the brake pedal adjustment, the brake & cruise switches - that leaves me with the ABS system.

I mention this to warn you of the road you may go down. . . . and to ask a simple question:

--> How do I disable the ABS so I can drive to work on my own?

Then... where can I find parts? I've searched Google for ABS parts to no avail except used parts on eBay.