1974 CHEVROLET K10 Recalls (2)

Campaign:: 74V027000 on 10/11/1979
Component:: Service brakes, hydraulic:power assist:vacuum
Affected:: 1,218,387
Notes:: Oldsmobile campaign no 74-c-5.buick campaign no 73-c-3.gmc truck campaignno 74-c-06.chevrolet campaign no 74-c-11.pontiac campaign no 74-c-5.possibility that the single diaphragm brake vacuum power booster was assembledwith demensional descrepancies in the vacuum power booster housing which mayreduce the torque required to unlock the front half of the housing from therear half.if this condition exists, the low unlocking torque coupled withother variations in the assembly may cause housing to rotate and disengage fromthe locking tabs resulting in separation of the two halves of the booster andcomplete loss of brakes.(correct by inspecting and staking the housing at twopoints to preclude rotation of the housing.
Campaign:: 74V065000 on 10/11/1979
Component:: Service brakes, hydraulic:fluid
Affected:: 642
Notes:: Chevrolet campaign no 74-c-14.possibility that the brake systems may havebeen filled with hydraulic brake fluid containing 2 or 3 percent water.ifthis condition exists it will reduce the boiling point of the brake fluid to apoint where braking efficiency may re reduced.(correct by draining, flushingand refilling with uncontaminated brake flued.)