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This condition could cause insufficient vacuum to be provided to the brake booster.

Service Brakes, Hydraulic — Power Assist — Vacuum — Hoses, Lines/Piping, And Fittings

Summary
Vehicle description: Passenger vehicles equipped with automatic transmissions. A control valve in the vacuum hose connecting the brake booster to the intake manifold may not open or close fully at temperatures below -4 F under certain driving conditions.
Actions
Dealers will install a vacuum by-pass system into vehicles operated in these states which is designed to provide sufficient vacuum for full brake assist under all weather conditions.
Documents (9)

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Date Announced
MAY 21, 1999
Vehicles Affected
88,121
Audi Recall #
UH/KU
NHTSA Campaign #
99V131001
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