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BMW NA has issued a recall for certain 4-cylinder powered 20i and 28i models for potential brake power assist problems. Here is the recall information from the NHTSA.

The affected models/years are as follows:

BMW/320I/2012-2014
BMW/328I/2012-2014
BMW/428I/2014
BMW/528I/2012-2013
BMW/X1/2013-2014
BMW/X3/2013-2014
BMW/Z4/2012-2014

NHTSA Campaign Number: 14V-627 (14V627000)

Components:
SERVICE BRAKES, HYDRAULICOWER ASSIST:VACUUM
SERVICE BRAKES, HYDRAULICOWER ASSIST:VACUUM:HOSES, LINES/PIPING, AND FITTINGS

Potential Number of Units Affected: 8,988

Problem Description:
BMW of North America LLC (BMW) is recalling certain model year 2014 BMW 328i xDrive Sports Wagon, 2012-2014 BMW 320i
Sedan, 328i Sedan, 320i xDrive Sedan, 328i xDrive Sedan, 2012-2013 BMW 528i Sedan, 528i xDrive Sedan, 2013-2014 BMW X1
sDrive28i, X1 xDrive28i Sports Activity Vehicle, 2013-2014 BMW X3 xDrive28i Sports Activity Vehicle, 2012-2014 BMW Z4
sDrive28i Roadster, and 2014 BMW 428i Coupe, and 428i xDrive Coupe. Due to insufficient lubrication, the vacuum pump that
supplies brake power assistance may fail.

Consequence:
A failure of the brake vacuum pump results in a reduction in braking power that could increase the risk of a crash.

Remedy:
BMW will notify owners, and dealers will install a locking ring in the camshaft to retain the camshaft seal disk in the proper location,
free of charge. The recall is expected to begin in November 2014. Owners may contact BMW customer service at 1-800-525-7417.