E53 X5 ALL Brakes Locking Up Randomly
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    03
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    X5
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    E53 X5 ALL Brakes Locking Up Randomly

    Greetings,

    Having scanned every forum with no results, hopefully someone hear as an answer. My problem started with rear brake line leak, had to take to independent supposed BMW expert, he replaced rear brake lines, went to pick up X5 and he said he can't bleed rear brakes and it needs new master cylinder. Having already dropped $420. for him to make brake lines, I was not about to spend another $500. plus, so drove it home on front brakes and ordered master cylinder to do job myself. Well, so called expert was wrong, it was not master cylinder, evidently ABS shuts off rear brake valve to avoid running out of fluid, so learning this, and also not able to bleed rear brakes, had to find out the hard way I needed a diagnostic bleeder to unlock rear brake valve. OK, then found out you can't effectively use vacuum bleeder, so had to buy pressure bleeder, got brakes bled, but now I have a real strange issue of all four brakes locking up randomly. Only way to release is to crack open brake line at master cylinder. Crazy, a few have had this issue but on every thread, no answer, so anyone know what could cause this. The codes I am pulling are Fault1 which is right front sensor, ordered and Fault 72 which is DCS Pressure Sensor Zero Deviation. I went so far as to pull all fuses related to ABS which cuts power to pump, so no pump, no pressure, right, and no change, brakes still locking up.

    Thanks,
    Last edited by FREEBUSINESSES; 17-07-2018 at 02:28.

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