Reported risk: VEHICLES EQUIPPED WITH WAGNER ELECTRIC SINGLE SYSTEM HYDRAULIC BRAKES MAY HAVE A BRAKE MASTER CYLINDER WITH A INCORRECTLY MACHINED LOCK RING GROOVE IN THE CYLINDER BORE. THIS CONDITION COULD ALLOW THE LOCK RING TO COME OUT AND ALLOW THE PISTON TO DISENGAGE FROM THE MASTER CYLINDER CAUSING A TOTAL LOSS OF SERVICE BRAKES WITHOUT PRIOR WARNING.
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