Thanks, that has to be it, car has 160k and it just stopped. I'm going to say it works like 18 wheeler breaks, it need air pressure to spin and if it losses air pressure the brakes go on full. I'm guessing when these valve goes bad it stay stuck open so you have heat.

FCP has the oem $180...oh well.

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2002 X5 4.4i Sport Wheels
2014 X5 35i M Appearance & suspension package
1995 Porsche 993
1972 Porsche 914-6
2020 GLE 450 Twin Turbo
2019 Alfa Stelvio 500hp Quadrifogilo
Many motorcycles