Dynojet 248x: Installation Guide - Manual (Page 34)

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Proportional Air Step 2
Install the Booster Valve Assembly.
Screw the booster valve assembly into the
right side brake canister. Tighten it so the
air gauge is facing out as shown below.
There are two air lines coming from the
electronic pressure regulator labeled "IN"
and "OUT".
The line labeled "OUT" is connected to the
3-way valve. Push the hose in then hand
tighten the fitting. Pull on the hose to
ensure it is seated properly. If it moves,
tighten the fitting more.