CHROME Chevy Disc Disc 7" Dual Power Booster Finned MC + Brackets & Prop Valve



Brand new 7" CHROME Dual brake booster, with all CHROME, finned top master Cylinder, CHROME Disc/Disc Proportioning Valve Kit, and all CHROME Mounting Brackets designed for a 1955 1956 1957 Chevy Car. This high quality kit has a beautiful chrome finish and will really improve your brake performance.  This 7" Dual diaphragm booster offers 19% better stopping power over the single 7" booster, and is ideal for most small to mid size street rods and customs.

The master cylinder in this kit is also all chrome. It is the finned-top style, and features a 1" bore and the ports measure 9/16" and 1/2".  This master cylinder will work with any drum/drum, disc/drum, or disc/disc setup. THIS SETUP IS DESIGNED FOR DISC/DISC APPLICATIONS.

This includes a disc/disc proportioning valve kit (self adjusting valve and bracket to mount kit to the side of the master cylinder).

The proportioning valve has a great CHROME finish.  This valve is also call a combination valve, as it performs all of the necessary valving functions with a disc brake conversion.  These functions include the following:

  • Proportioning:

As more force is applied to the brakes and the car begins to lean forward, less braking force is needed in the rear.  This valve decreases the pressure to the rear, preventing lock up.

  • Metering:

Metering is used in the front disk brake portion in the disc/drum system to delay application of the front discs allowing the slower reacting drum brakes to catch up.  This provides rear stability on wet surfaces and helps prevent front pad wear.  There is no metering function with the disc/disc setup.

  • Residual Pressure:

Drum Brakes require residual pressure of 10 lbs. to be held in the line.  This pressure keeps the brake shoes close to the drums giving you a more firm pedal feel.  The disc/disc setup does not require this pressure.

  • System Failure Switch:

This valve has a system failure switch that will alert you when half of your braking system is not working properly.

Additionally this Kit includes the necessary Mounting Brackets/Rod/Clevis for your classic 55-57 Chevy


If you're looking for this Booster/Master Cylinder Kit for a DISC/DRUM Application you can find that HERE

For 10 Pound residual pressure valves (Drum Brakes), Click Here.

For 2 Pound residual pressure valves (Disc Brakes), Click Here

7” Dual Chrome + 3510-4C + Driver Side PV4C Bracket Kit + 7800c/Rod/Clevis




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Most orders will be shipped within 1-3 business days from receiving your payment unless otherwise noted in the auction. Shipping rates apply ONLY to the USA lower 48 states. We can combine shipping on most auctions. Please wait for us to send you a combined invoice before paying. We cannot combine shipping if you pay for your items separately or on different dates. If item is on back order a rain check can be issued by our office with the shipping discounted for the inconvenience.




We will accept returns on merchandise that is in brand new, uninstalled condition for exchange or store credit only. All returns must be approved by our office. Buyer is responsible for all shipping and handling charges. Returns must be made within 14 days of receiving the item.


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