System: brakes; hydraulic; linkage; pedal.vehicle description: B7 school bus chassis equipped with hydraulic brakes.if your vehicle IS presented to an authorized dealer on an agreed upon servicedate and the remedy IS not provided within a reasonable time and free of chargeor the remedy does not correct the defect or noncompliance, please contactgmc service center at 1-313-456-4547 or chevrolet service center at1-800-222-1020. Also contact the national highway traffic safetyadministration's auto safety hotline at 1-800-424-9393.