What is the torque spec for the vacuum outlet manifold assembly screw on the F-Super Duty?

Screw 802658 is torqued to 1.9-2.5 N·m (17-22 in-lb) on the F-Super Duty; on the F250/DY-350 it is 2-3 N·m.

What hose and clamp part numbers are used for the brake booster vacuum line?

The diagrams call out vacuum hose 381298 (one View C callout reads 381288) secured with clamp 382984.

How does the 7.3L diesel supply vacuum to the brake booster?

The 7.3L diesel uses a vacuum pump feeding through vacuum manifold 9C490 and hose 381298 with clamp 382984 to the booster and master cylinder.

Does the vacuum line routing differ for the 5.8L engine by weight rating?

Yes, separate diagrams show routing for the 5.8L EFI engine under 8500 lbs GVW and over 8500 lbs GVW, the latter with a hose guide shown in View B.

Where does the 5.0L EFI vacuum hose route in the engine bay?

On the 5.0L EFI engine the vacuum hose 381298 routes near the A/C hose and air cleaner, secured with clamps 382984.

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Ford Brake Booster Vacuum Hose Routing Diagram - 4.9L 5.0L 5.8L 7.3L 7.5L

Ford F-Super Duty/F250-350 brake vacuum line installation for 4.9L, 5.0L, 5.8L EFI, 7.3L diesel, 7.5L engines

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Ford truck power-brake vacuum line routing by engine: 7.3L diesel, 4.9L/5.0L/5.8L EFI, 7.5L. Vacuum outlet manifold screws torqued 1.9-2.5 N-m (17-22 in-lb).

AI caption October 2005 · Photo 104 of 277

This scanned Ford service manual illustration page (figure H4973-F) shows the installation and routing of the brake booster vacuum supply line for multiple Ford truck engines. Seven labeled diagrams cover: the 7.3L diesel engine (which uses a vacuum pump, vacuum manifold 9C490, hose 381298, and clamp 382984 routing to the brake booster and master cylinder), the 4.9L EFI engine, the 5.0L EFI engine (routing near the A/C hose and air cleaner), the 5.8L EFI engine both under and over 8500 lbs GVW, and the 7.5L engine. Two detail insets at top right show the vacuum outlet manifold assembly attachment for F-Super Duty (screw 802658 torqued to 1.9-2.5 N·m / 17-22 in-lb) and for F250/DY-350 (screw 802658 torqued to 2-3 N·m). Bottom insets (View B and View C) show hose guides for the 5.8L over-8500 GVW and 7.5L applications. Recurring part numbers include hose 381298 (one callout reads 381288), clamp 382984, screw 802658, and vacuum manifold 9C490. A reader can learn correct hose routing, clamp locations, and manifold screw torque values for each engine variant.

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Frequently asked questions

What is the torque spec for the vacuum outlet manifold assembly screw on the F-Super Duty?: Screw 802658 is torqued to 1.9-2.5 N·m (17-22 in-lb) on the F-Super Duty; on the F250/DY-350 it is 2-3 N·m.
What hose and clamp part numbers are used for the brake booster vacuum line?: The diagrams call out vacuum hose 381298 (one View C callout reads 381288) secured with clamp 382984.
How does the 7.3L diesel supply vacuum to the brake booster?: The 7.3L diesel uses a vacuum pump feeding through vacuum manifold 9C490 and hose 381298 with clamp 382984 to the booster and master cylinder.
Does the vacuum line routing differ for the 5.8L engine by weight rating?: Yes, separate diagrams show routing for the 5.8L EFI engine under 8500 lbs GVW and over 8500 lbs GVW, the latter with a hose guide shown in View B.
Where does the 5.0L EFI vacuum hose route in the engine bay?: On the 5.0L EFI engine the vacuum hose 381298 routes near the A/C hose and air cleaner, secured with clamps 382984.