We are open and actively processing orders, however, please note some products may not be available or may take longer than normal to arrive due to the COVID-19 virus. All KeyParts ground shipped products are shipping 5 business days after placing your order, all Truck Freighted (large and heavy) items are shipping 4 to 6 weeks after placing your order.
American Autowire products are shipping 4 to 6 weeks after placing your order.
Truck Front Disc/Rear Drums Proportioning Valve
Works on all 1978-87 Chevy and GMC full size trucks that have front disc brakes and drum rear brakes.
Works on half ton through one ton, 2 and 4 wheel drive
This Chevy truck brake proportioning valve comes with a 1 year warranty.
For use on Disc/Drum Setup Only
Our brake proportioning valve has a 9/16"-18 connection for Rear Brakes & Dual 3/8"-24 ports for the front brakes.
The connections from the Master Cylinder are 1/2"-20 and 7/16"-24.
This valve comes with a 1 year warranty.
We also offer a pigtail for the prop valve wire sensor and a prop valve bleeding tool in the related items section of this page.
If you drive a Chevrolet or GMC full-size truck from model years 1981 - 1987, then this is the correct brake proportioning valve for your front disc and rear drum brakes. This part works on full-size Chevy and GM trucks from half ton through one ton, whether it's a 2-wheel drive or a 4-wheel drive. If you've got GMC or Chevy brake proportioning valve problems, this part will help fix the following vehicles:
This part is designed to fit the following vehicles.Chevy Truck 1978
Average based on 39 reviews
Write an online review and share your thoughts with others.