GM Brakes: Theory-Brake balance via the Proportioning Valve. The reason for this is because of the car nose-diving when you hit the brakes. Braking tends to force down the front wheels, and lifts the rear end of the car up. Typically rear wheel drive cars have 60-70% of the brakes geared toward the front. In front wheel driven cars, this can be from 80-90% as the front wheels are also the drive wheels.
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Seller:gearheadworld(96,697)99%, Location:Hudson, Iowa, Ships to: US & many other countries, Item:312019195897GM A-Body Manual Master Cylinder w Bleeders + Disc Drum Proportioning Valve Kit GM A-Body Manual Master Cylinder w Bleeders + Disc Drum Proportioning Valve Kit Click images to enlarge Description This is a newly manufactured GM cast iron Manual master cylinder with bleeders. These master cylinders work well with the following applications (list is NOT all-inclusive): 1964-1972 Chevrolet Chevelle 1964-1972 Chevrolet El Camino 1964-1972 Pontiac LeMans 1964-1972 Pontiac GTO 1964-1972 Pontiac Tempest 1964-1972 Oldsmobile Cutlass 1964-1972 Olds 442 1964-1972 Buick Skylark 1970-1972 Chevrolet Monte Carlo 1968-1974 Chevrolet Nova 1971-1974 Pontiac Ventura 1967-1969 Chevrolet Camaro 1967-1969 Pontiac Firebird These master cylinders feature a 1' bore. These are brand new dual resevoir cast iron master cylinders. Also included is a disc/drum proportioning valve kit (self adjusting valve, lines and bracket to mount kit to the side of the master cylinder). The proportioning valve has a zinc finish. This valve is also called 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. As with any brake job, professional installation is recommended, as it is vital that everything is installed correctly prior to use. Should you opt to do the install yourself, ALWAYS follow the manufacturer's service and install directions carefully to avoid damage to yourself, your car or its components. 309-2 MC + PV2 Side Bracket + Lines Payment We prefer instant payments through Paypal. To avoid non-paying bidder warnings, please pay for any auctions you win within 10 days. Shipping Most orders will be shipped within 1-3 business days from receiving your payment unless otherwise noted in the auction. Shipping rates apply to the USA only. Please email us for international shipping rates and we can clear you to bid. 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. All returns must be approved by our office and will be subject to a 15% restocking fee. Buyer is responsible for all shipping and handling charges. Returns must be made within 14 days of receiving the item. About Us We have discount prices on thousands of parts for your Street Rod, Hot Rod, and Custom Car or Truck. Parts are added to our store daily, so check back often for the latest deals! Plus, we have access to thousands of parts that are not listed. So, if you need something 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! Contact Us We do get hundreds of emails daily, so at times it may take us up to 72 hours to respond to your emails. Our office is open from 8 AM to 6 PM Monday thru Friday (Central time). Images sell! Get Supersized Images & Free Image HostingCreate your brand with Auctiva's Customizable Templates. The complete eBay Selling Solution. Track Page Views With Auctiva's FREE CounterCondition:New, Manufacturer Part Number:309-2 MC + PV2 Side Bracket + Lines, Brand:Gearhead Enterprises