Q: My brakes brake then release and brake again

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My brakes brake then release and brake again.

My car has 51000 miles.
My car has an automatic transmission.

The brakes work and release and work again is the anti lock brakes engaging. This can be due to a failure in the rear wheel speed sensor not sending a clean steady signal. The sensor is in the rear axle housing and can start to get coated with metal from the rear end normal operation. I would recommend having a mechanic like one from YourMechanic come and diagnose the ABS system for the braking is erratic. If the rear axle speed sensor is defective then have speed sensor replaced and if excessive metal particles are on the sensor then have the rear axle fluid services and gears washed out of excessive metal particles and install cover and refill gear lube.

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