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BMW X3: rear brake circuit and diagnosis after wheel damage

NHTSA 18V-453 on piston coating, gas in the circuit and its distinction from impact damage.

3D body illustration

G01 body illustration. G01 (2018–2024)

Original 3D illustration: 2020 BMW X3 (G01 (2018–2024))

«2020 BMW X3» — tonielpro520, CC BY 4.0. Author’s original. The web container was unpacked without changing the model data.

This is a body illustration, not a photo, a measurement or a reconstruction of a specific VIN. Trim and part match is not confirmed.

A mechanism without an external break

BMW describes an incorrect supplier coating process on rear-caliper pistons. Gas could be temporarily retained and later released into the rear brake circuit. Gas pockets could reduce rear braking; slightly increased pedal travel is a possible sign.

BMW of North America / NHTSA repository: Part 573 Safety Recall Report 18V-453

Applicability and the full analysis

Wheel impact requires vehicle-specific observations

Record the exact contact, crack, deformation or leak. Separate wheel, brake, hose and neighbouring assemblies. A component hidden behind an unremoved wheel cannot be marked sound from an overview photograph.

Editorial inspection order.

Applicability and the full analysis

Full material about the model

BMW X3: rear brake circuit and diagnosis after wheel damage

NHTSA 18V-453 on piston coating, gas in the circuit and its distinction from impact damage.

Owner complaints and recalls

Common problems of the BMW X3 → Complaints by year, symptoms, recalls and service bulletins.