You may need to install the foam insulator the vacuum
Brake Booster, the brake booster, the booster mounting nuts, the foam washer, and the brake booster push rod retaining clip, then tighten the vacuum brake booster mounting nuts to 25 N.m (18 lb-ft), then install the brake pressure modulator valve bracket, the brake pressure modulator valve assembly, the vacuum booster check valve and hose assembly and the coolant surge hose and clamp, next install the underhood electrical center.