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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 Brass, Passenger's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Brass, Passenger's Side, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-RB1

0%

$99.00
Proportioning Valve W/Bracket & Lines Undermount, Frame Mount, 3/8 x 24 Ports
2 or 4 Wheel Disc, Aluminum, Undermount, Frame Mount, Gold Zinc Bracket, 3/8 x 24 Ports
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In Stock

Part # PVKU-A1-316

0%

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

Part # PVKS-B0

0%

$99.00
Proportioning Valve W/Bracket & Lines Undermount, Frame Mount, 1/2x20 & 9/16x18 Ports, Gold
2 or 4 Wheel Disc, Aluminum, Undermount, Frame Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKU-A0

0%

$115.00
Brass 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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In Stock

Part # PV-24BH

0%

$79.00
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 W/Bracket & Lines
2 or 4 Wheel Disc, Brass, Driver's Side, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKS-B1

0%

$99.00
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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In Stock

Part # PVKU-BL0

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 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
Proportioning Valve W/Bracket & 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-BL1

0%

$99.00
Proportioning Valve W/Bracket & Lines Chrome, Passenger's Side, Firewall Mount, 3/8 x 24 Ports
2 or 4 Wheel Disc, Chrome, Passenger's Side, Firewall Mount, Gold Zinc Bracket, 3/8 x 24 Master Ports
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In Stock

Part # PVKS-4CR-316

0%

$119.00
Proportioning Valve W/Bracket & 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
Add to Compare
In Stock

Part # PVKS-A0

0%

$99.00
Proportioning Valve W/Bracket & Lines Chrome, Undermount, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Chrome, Undermount, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
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In Stock

Part # PVKN-C0

0%

$119.00
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 Passenger's Side, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Aluminum, Passenger's Side, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
Add to Compare
In Stock

Part # PVKS-RA1

0%

$99.00
Proportioning Valve W/Bracket & Lines Chrome Undermount, Frame Mount,, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Chrome Aluminum, Undermount, Frame Mount, Chrome Bracket, 1/2x20 & 9/16x18 Master Ports
Add to Compare
In Stock

Part # PVKU-C0

0%

$135.00
Proportioning Valve W/Bracket & 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
Add to Compare
In Stock

Part # PVKS-BL1WW

0%

$99.00
Proportioning Valve W/Bracket & Lines Undermount, Firewall Mount, 1/2x20 & 9/16x18 Ports, Gold
2 or 4 Wheel Disc, Aluminum, Undermount, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
Add to Compare
In Stock

Part # PVKN-A1

0%

$99.00
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
Add to Compare
In Stock

Part # PBKU-A0

0%

$115.00
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 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
Add to Compare
In Stock

Part # PVKU-B0

0%

$115.00
Proportioning Valve W/Bracket & Lines Undermount, Firewall Mount, 1/2x20 & 9/16x18 Ports
2 or 4 Wheel Disc, Aluminum, Undermount, Firewall Mount, Gold Zinc Bracket, 1/2x20 & 9/16x18 Master Ports
Add to Compare
In Stock

Part # PVKU-M

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
Add to Compare
In Stock

Part # PVKS-BL0

0%

$99.00
Chrome 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
Add to Compare
In Stock

Part # PV-24AHC

0%

$89.00
Proportioning Valve W/Bracket & Lines Undermount, Firewall Mount, 1/2x20 & 9/16x18 Ports, Black
2 or 4 Wheel Disc, Aluminum, Undermount, Firewall Mount, Black Bracket, 1/2x20 & 9/16x18 Master Ports
Add to Compare
In Stock

Part # PVKN-A0

0%

$99.00
Proportioning Valve W/Bracket & Lines Brass, Driver's Side, Firewall Mount, 3/8 x 24 Ports
2 or 4 Wheel Disc, Brass, Driver's Side, Firewall Mount, Gold Zinc Bracket, 3/8 x 24 Master Ports
Add to Compare
In Stock

Part # PVKS-B1-316

0%

$99.00
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
Add to Compare
In Stock

Part # PVKS-2CR

0%

$119.00
Proportioning Valve W/Bracket & Lines Chrome Driver's Side, Firewall Mount,, 3/8 x 24 Ports
2 or 4 Wheel Disc, Chrome Aluminum, Driver's Side, Firewall Mount, Chrome Bracket, 3/8 x 24 Master Ports
Add to Compare
In Stock

Part # PVKS-C0-316

0%

$119.00
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
Add to Compare
In Stock

Part # PV-24BBH

0%

$79.00

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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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