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Description

This is a Brand new 8" Dual brake booster, with a zinc Bail Top master Cylinder, Disc/Drum Proportioning Valve, and Mounting Brackets designed for a 1955 1956 1957 Chevy Car. This high quality kit has a will really improve your brake performance.  This 8" Dual diaphragm booster offers 25% better stopping power over the single 7" booster, and is ideal for most small to mid size street rods and customs.   The booster mounts with a 4-bolt pattern.  The 4 bolts are in a perfect square and are 3 3/8" apart (center to center).

The master cylinder in this kit is of the Bail Top style and features a 1 1/8" bore.  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/drum proportioning valve kit (self adjusting valve and bracket to mount kit to the side of the master cylinder).

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. 

Please check out our store for this kit set-up with the proportioning valve for either Disc/Disc applications

    Please Note: Professional Installation is Highly Recommended (No Instructions Included)

8” Dual Zinc + 3512 + 7800z kit + PV4 side Kit

Payment

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Shipping

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.

Terms of Sale

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.

About Us

We are Gearhead Enterprises - a national street rod parts supply company. Parts are added to our store weekly so check often for the latest deals! Plus, we have access to thousands of parts that are not listed. So, if you need something auctioned that you don't see or want to make a change to an auction, please email us. We can change or setup any auction you need!

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