Wilwood Proportioning Valve - Knob Adjust 1/8 NPT

Wilwood Adjustable Proportioning Valve – next-generation brake pressure control

A compact, forged-aluminum body houses Wilwood’s latest engineering, giving you faster, more accurate bias tuning than ever before. The precise, fine-thread adjuster lets you vary line pressure from 100 to 1000 PSI and, when needed, slash it by up to 57%—the highest reduction range on the market.

Key benefits

• Pin-point adjustability – the linear knob makes it easy to dial-in the exact rear-brake pressure your setup demands.

• Featherweight build – just 5.2 oz minimizes unsprung weight near calipers and hoses.

• Forged housing – motorsport-grade strength against vibration and high pressure.

• Plug-and-play plumbing – dual 1/8-27 NPT ports plus two included 3/8-24 inverted-flare fittings match most 3/16" hard lines.

• Universal mounting – twin Ø 0.25" ears (1.00" spacing) bolt straight to firewall, frame rail or handbrake bracket.

Typical uses

• Fine-tuning balance after a big-brake kit or rotor size change.

• Drift, time-attack and rally cars where front-to-rear bias shifts with tyres and surface grip.

• Hydraulic hand-brake systems needing quick rear-line pressure drop