POWERWORKS PV2 Brass Proportioning Valve 172-1353 — Disc Front / Drum Rear Brake Bias Control, Solid Brass

POWERWORKS PV2 Brass Proportioning Valve 172-1353 is a solid-brass combination valve that balances front disc and rear drum braking pressure for dual-reservoir master cylinder systems.

This compact PV2 proportioning valve from POWERWORKS is built for reliable brake bias control where vehicles use front disc and rear drum brakes. Machined from solid brass, it provides corrosion resistance and long-term durability while fitting most dual-reservoir master cylinder setups. Designed as a drop-in solution for replacements or custom brake plumbing, the 172-1353 model helps maintain proper rear brake modulation to reduce premature wheel lock-up and uneven stopping.

How does the PV2 proportioning valve affect brake performance?

The valve adjusts hydraulic pressure to the rear drum circuit relative to the front discs, helping prevent rear-wheel lockup under hard braking. It doesn't alter master cylinder output; it proportionally reduces rear pressure to match the vehicle's brake geometry and weight distribution.

• Balances front/rear brake force for safer stops.
• Reduces risk of rear lockup on heavy braking.
• Designed for disc front and drum rear brake systems.

Which vehicles and master cylinders is this PV2 valve compatible with?

The 172-1353 is a universal-style PV2 proportioning valve that fits most dual-reservoir master cylinders and many classic or modern vehicle brake systems. It is commonly used as a replacement on American makes, including Chevy platforms, and in custom brake setups.

• Compatible with most dual-reservoir master cylinders.
• Works for disc-front, drum-rear brake layouts (disc/drum).
• Common fitment for Chevy and other vehicles with similar brake plumbing.

What are the build and connection specifics I should know before buying?

The valve is constructed from solid brass for heavy-duty service and corrosion resistance. Brake-line port sizes are standard 1/2" and 7/16", so verify hose or hard-line fittings match or adapt accordingly prior to installation.

• Material: solid brass for durability and rust resistance.
• Port sizes: 1/2" and 7/16" brake line ports — adapters may be required.
• Model reference: 172-1353 (disc-drum) — also available in disc-disc variant 172-1361.

Is installation difficult and what should I prepare?

Installation requires basic hydraulic brake knowledge, proper line fitting, and bleeding of the brake system. While the valve is a straightforward mechanical component, safe installation includes securing proper torque, leak testing, and complete system bleeding to remove air.

• Tools: wrenches sized for 1/2" and 7/16" fittings, thread sealant or appropriate line adapters.
• Steps: mount valve, connect inlet/outlets, torque fittings, and fully bleed brakes.
• Safety: test slowly and check for leaks before road use.

Who is this for: The POWERWORKS PV2 172-1353 is aimed at mechanics, restoration enthusiasts, and DIYers working on vehicles with front disc and rear drum brakes who need a durable, brass proportioning valve that fits most dual-reservoir master cylinders. It's a practical choice for brake replacements, custom brake lines, or upgrades where reliable pressure balancing and corrosion resistance are priorities.