Transport CanadaHigh Risk
1994 GMC S SERIESTransport Canada Recall #1994180
The official notice
Defect
On certain S10, S15, T10 and T15, the vacuum hose may detach from the brake booster check valve as a result of engine backfire. This would result in increased engine idle and loss of brake power assist after depletion of the booster vacuum reserve. A significant increase in brake pedal pressure experienced by the driver combined with increased engine rpm when minimal stopping distances are required could result in a vehicle crash.
Safety Risk
No risk description available.
Remedy
A clamp will be installed on the power brake booster hose at the brake booster check valve end.
1,496 vehicles affectedMfr ref: 4D45/94089Updated June 10, 2026