Have a fun problem the tech team says they've never seen before.
As part of a comprehensive refresh and engine out we replaced all four calipers with rebuilt ones, and also replaced the brake booster with a NOS.
Brakes were afaik working just fine with no codes before we started all this work.
Here's the writeup. Working on getting more detail. Have also suggested from research here checking the magnetic hub sensors and replacing the BLS (part here) per threads and the FAQ here.
tech's writeup:
Power Bled brakes once. Completely non functional.
Power bled again using more pressure and fluid, front left and rear right caliper function. No ABS.
Power bled and manual bled all calipers on reverse order as recommended by prodemand, still no ABS and only 2 calipers function.
Bench tested calipers to verify function. Manually bled the master cylinder and all ABS module lines, abs pressure sensor etc.
Abs module does not have electronic bleed procedure. Power bled calipers again, all brakes function well, car stops like normal.
Abs and esp still do not function. At this point the brakes stick on until pressure is relieved.
Released pressure and power bled once more. Brakes still function well, abs and esp still non functioning, brakes begin to stick on the more they are used.
Inconsistent abs fault code is 'ABS pressure sensor 1'.
Replacing sensor to clear fault. And probably the BLS and cleaning the hub sensors just to make sure.
If fault is not cleared with new sensor, ABS module is likely faulty?
Anyone with any experience with the rebuilding services, e.g. ABS.de? Cost certainly looks positive compared to buying one...
Anyone any other thoughts, ideas, etc? Will report back hopefully with additional troubleshooting detail, as well as results...
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