Premium Aluminum Brake Bleeder Tool Set Two Pack For PV2 PV4 ✔️ Proportioning valve bleeder adapter for PV2 PV4 disc drum maintenance This proportioning valve bleed kit takes the guesswork out of rear brake maintenance. Techs slide it right onto the warning switch port to shut off master cylinder pressure regulation. The quick swap lets you flush trapped fluid fast without messing up the pedal feel on disc or drum setups. ✅ Rugged aluminum housing stands up to daily drops and road grime without bending ✅ Precise 17 millimeter shaft threads safely into combo valve boss openings ✅ Compact 40 millimeter reach clears tight engine compartment brackets ✅ Ultra light 18 gram build keeps your toolbox balanced and easy to grip ✅ Double unit layout swaps out instantly when running through multiple trucks 💡 Why rely on a dedicated proportioning valve bleed adapter when flushing combined disc drum brake circuits? The main advantage comes from physically blocking the internal metering valve so front brakes engage first while you purge the rear lines. Here is how a quick swap changes your shop workflow: - Overrides factory travel bars to give you firm pedal resistance instead of mushy feedback - Holds master cylinder reservoir pressure steady so you never accidentally push fluid backward into unseated seals - Stops old combo switches from tripping mid bleed which otherwise resets your bleeding progress completely - Cuts labor hours by letting a solo mechanic manage fluid directions without wrestling with brake squeaks or false triggers ✝️