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Proportioning Valves and Accessories

Classic Performance Products offers a range of brake proportioning valves and accessories, ensuring the correct brake fluid pressure for your vehicle’s front and rear wheels. Available in both fixed and adjustable options, these valves are essential for drum-to-disc brake upgrades. Features include a warning light switch for detecting pressure loss and the ability to be wired into your system. Our valves handle four key functions: ... proportioning pressure, a 10 psi residual check valve, a metering valve for the rear brakes, and a brake warning light. Ideal for maintaining balanced brake performance and preventing rear drum brakes from locking up too easily, these valves are a crucial component for your classic car or truck's braking system.

Why Choose Classic Performance for Your Proportioning Valves and Accessories
We are passionate classic and sports car enthusiasts with three decades of industry experience and rigorously test and utilize every product we offer. Whether enduring tough track days or clocking thousands of miles on the street, you can trust that professionals have thoroughly vetted every part we carry.

Our knowledgeable support team is always ready to assist you with any questions or concerns about our Proportioning Valves and Accessories. We are here to ensure you have a seamless and satisfying experience finding the perfect solution for your classic vehicle's braking system.

Elevate your classic driving experience with a Proportioning Valve Kit from ClassicPerform.com. Count on us to provide a comprehensive solution that meets and surpasses your expectations. Enhance the safety and performance of your classic vehicle's braking system confidently and enjoy the road like never before. Trust Classic Performance Parts for all your Proportioning Valves and Accessories needs.

Proportioning Valve W/Bracket & Lines Undermount, Frame Mount, 1/2x20 & 9/16x18 Ports, Black
2 or 4 Wheel Disc, Aluminum, Undermount, Frame Mount, Black Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PBKU-A0

0%

$115.00
Proportioning Valve W/Bracket, Wire & Lines Black, Driver's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Black Aluminum, Driver's Side, Firewall Mount, Black Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-BL0

0%

$99.00
Proportioning Valve Lines to the Cylinder Steel Lines, 9/16 x 18 rear and 1/2 x 20 Front
Driver's Side Firewall for CPP's APV-DB & APV-DBC Valves, Steel Lines, Master Cylinder Ports are 9/16 x 18 rear and 1/2 x 20 Front
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In Stock

Part # PVL-APVDB

0%

$15.00
GM Proportioning Valve Lines to the Cylinder Undermount Frame Mount, 9/16 x 18 rear and 1/2 x 20 Front
Undermount Frame Mount for CPP's PV- Series Valves, Steel Lines, Master Cylinder Ports are 9/16 x 18 rear and 1/2 x 20 Front
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Part # PVL-U

0%

$20.00
Proportioning Valve Bracket, Undermount, Yellow Zinc
Undermount, Yellow Zinc, used with CPP PV- Style Proportioning Valves
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In Stock

Part # PVBU-K

0%

$20.00
Proportioning Valve W/Bracket, Wire & Lines Driver's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Aluminum, Driver's Side, Firewall Mount, Black Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-A1

0%

$99.00
Proportioning Valve Bracket, Right Hand Side Mount, Chrome
To be used with CPP PV- Style Proportioning Valves, Right Hand Side Mount, Chrome
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Part # PVB-SR-C

0%

$25.00
Proportioning Valve W/Bracket & Lines Brass, Undermount, Frame Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Brass, Undermount, Frame Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKU-B0

0%

$115.00
Prop & Block W/Bracket & Lines Black Undermount, Frame Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Black Aluminum, Undermount, Frame Mount, Black Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKU-BL1

0%

$115.00
Proportioning Valve W/Bracket & Lines Chrome Driver's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Chrome Aluminum, Driver's Side, Firewall Mount, Chrome Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-C0

0%

$119.00
Proportioning Valve Lines to the Cylinder Driver's Side Firewall, 9/16 x 18 rear and 1/2 x 20 Front, Chrome Lines
Driver's Side Firewall for CPP's PV- Series Valves, Chrome Lines, Master Cylinder Ports are 9/16 x 18 rear and 1/2 x 20 Front
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In Stock

Part # PVL-S-C

0%

$15.00
Proportioning Valve Bracket, Undermount, Chrome
Undermount, Chrome, used with CPP PV- Style Proportioning Valves
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Part # PVB-U-C

0%

$30.00
Proportioning Valve W/Bracket & Lines Black Driver's Side, Firewall Mount Adjustable, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Black Aluminum, Driver's Side, Firewall Mount Adjustable, Black Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-APVDB

0%

$119.00
Proportioning Valve Cover, Chrome
Chrome Finish
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Part # PVC-C

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$10.00
Proportioning Valve Lines to the Cylinder Driver's Side Firewall, 9/16 x 18 rear and 1/2 x 20 Front, Steel Lines
Driver's Side Firewall for CPP's PV- Series Valves, Steel Lines, Master Cylinder Ports are 9/16 x 18 rear and 1/2 x 20 Front
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In Stock

Part # PVL-S

0%

$10.00
Proportioning Valve W/Bracket, Wire & Lines Chrome Driver's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Chrome Aluminum, Driver's Side, Firewall Mount, Chrome Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-C1

0%

$119.00
Wilwood Combo Valve Tubing, Long
Tube Assembly, Combo P-Valve, Remote Tandem, Long, -3 If Male To Male, Cres
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Part # 190-14246

0%

$36.00
Rear Relief Proportioning Valve, Black
Black Finish
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Part # PV-24NB

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$25.00
Black Aluminum Proportioning Valve for 2 & 4 Wheel Disc
1/2x20 to front M/C, 7/16x24 to Rear M/C, 3/8x24 Out to Front (2 ports), 9/16x18 Out to Rear Port
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Part # PV-24BBH

0%

$79.00
Proportioning Valve Lines to the Cylinder Undermount Frame Mount, 9/16 x 18 rear and 1/2 x 20 Front, Steel Lines
Undermount Frame Mount, Frame Side, for CPP's PV- Series Valves, Steel Lines, Master Cylinder Ports are 9/16 x 18 rear and 1/2 x 20 Front
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In Stock

Part # PVL-UR

0%

$15.00
Proportioning Valve W/Bracket & Lines Chrome, Passenger's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Chrome, Passenger's Side, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-2CR

0%

$119.00
Aluminum Proportioning Valve for 2 & 4 Wheel Disc (2 Port)
1/2x20 to front M/C, 7/16x24 to Rear M/C, 3/8x24 Out to Front (2 ports), 9/16x18 Out to Rear Port
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In Stock

Part # PV-24AH

0%

$79.00
Proportioning Valve W/Bracket & Lines & Wire Black Undermount, Frame Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Black Aluminum, Undermount, Frame Mount, Black Bracket, 1/2x20 & 9/16x18 Master Ports
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Part # PVKU-BL0

0%

$115.00
Metering Valve Assembly Repair Kit
For PV-Style Proportioning Vales
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Part # PVMVK-D

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$25.00
Proportioning Valve Lines to the Cylinder Undermount for Firewall, 9/16 x 20 Front and 1/2 x 20 Rear
Undermount for Firewall for CPP's PV- Series Valves, Chrome Lines, Master Cylinder Ports are 9/16 x 20 Front and 1/2 x 20 Rear
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Part # PVL-UM-C

0%

$45.00
Proportioning Valve Bracket & Lines, Drivers Side for Firewall, 9/16 x 18 rear and 1/2 x 20 Front, Gold
Driver's Side for Firewall, Master Cylinder Ports are 9/16 x 18 rear and 1/2 x 20 Front, Gold Zinc, for CPP's PV- Style Valves
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In Stock

Part # PVBLK-S

0%

$25.00
Rear Relief Proportioning Valve, Chrome
Chrome Finish
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Part # PV-24NC

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$25.00
Proportioning Valve Adapter Fitting Kit - Set of 3
9/16-18 Inverted Male To 3/8-24, and 7/16-24, and 1/2-20 Inverted Female
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In Stock

Part # CP2091

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$20.00
Proportioning Valve Bracket, Left Hand Side Mount, Blue Zinc
Left Hand Side Mount, Blue Zinc, used with CPP PV- Style Proportioning Valves
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In Stock

Part # PVB-SBLUE

0%

$10.00
Wilwood Integral Reservoir Compact Master Cylinder 3/4in Assembly
M/C, Girling Style, 3/4in. Assembly
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In Stock

Part # 260-1304

0%

$86.00

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Frequently Asked Questions

Does a 4 wheel disc need a different proportioning valve?

Not when you buy one of our CPP proportioning valves. Our proportioning valve will work with both disc/drum or disc/disc applications.

What does a brake proportioning valve do?

A brake proportioning valve regulates the brake fluid pressure between the front and rear brakes, ensuring balanced braking power.

What size fitting is the back of the proportioning valve?

The fitting size is 9/16-18" but we sell a kit that would accommodate any popular size adapter (part number CP2091) which includes 3/8-24", 7/16-24", and 1/2-20".

Do I need a proportioning valve when upgrading from drum to disc?

Yes! A proportioning valve is needed to ensure the proper amount of brake fluid pressure is going to the front and rear wheels.

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