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Ford Performance Adjustable Rear Brake Proportioning Valve (79-93 5.0L)

Item 50381
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Rear Brake Proportioning Valve
      • Perfect for Disc Brake Conversions
      • Adjustable from 100 to 1000 psi
      • Small Compact Design
      • Fits 1979-1993 5.0L Mustangs


      Prevent Rear Brake Lock-up. An improperly balanced rear braking system can make stopping difficult at best, but a Ford Racing Adjustable Proportioning Valve will allow you to properly adjust the rate of hydraulic pressure rise to the rear brakes to prevent rear brake lock up and a possible accident.

      Adjustable. Designed to be installed in the rear brake line, this Ford Racing Brake Proportioning Valve is adjustable, so you can control the hydraulic pressure from 100 to 1000 psi when the brakes are applied.

      Legendary Ford Racing Quality. When you're adding performance parts to your Pony, you can't go wrong by installing parts from the folks that know it best. Ford Racing's legendary quality ensures a perfect fit and years of hassle-free use.

      Application. This Ford Racing Adjustable Rear Brake Proportioning Valve is designed for use on 1979 to 1993 5.0L Mustangs, including the 5.0 LX, GT, and SVT Cobra. Perfect for disc brake conversions.

      Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993

      MPN# M-2328-C

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (7)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 7 customers

      • August 31, 2017

        5 1984 Other - Tom


        As always, ordering the part was made easy on your website part was delivered right away. I look forward to installing this in my 94 Mustang in see how the new rear disc brakes set up works. THANK YOU

        Helpful (15)
      • January 16, 2017

        5 1986 Other - 86stang

        Great for disk brake conversion

        Install took about 10min, it's a must have for disk brake conversion on your fox.

        Helpful (16)
      • September 16, 2016

        5 1987 Other - 87tbird50


        Fit perfectly on my 87 thunderbird lx almost all ford cars from 79 to 93 have similar parts that would fit a car this website should really expand there parts to other ford musrcury and lincolds

        Helpful (15)
      • May 08, 2016

        5 1988 Other - slowgo5oh

        Awesome product

        I'm upgrading the brakes on my 88 Thunderbird(5.0) and needed this to adjust the bias. This did the job and added a little "bling" to the strut tower as well. Seems to be a well built product . A/M scores again.!

        Helpful (15)
      • December 18, 2014

        5 1987 GT - gone2000

        simply a great product

        This adjustable regulator install easily in the designed location on the fire wall. It included all necessary hardware to install properly.

        Helpful (16)
      • January 22, 2013

        5 1991 Other - LXFAN79

        Perfect for my 5 lug conversion.

        This was exactly what I needed for my 5 lug conversion. Now my brakes dont feel too soft or too firm. Thanks again AM!

        Helpful (14)
      • December 11, 2012

        5 1979 Other - Kolby

        Excellent Product.

        This easy to install part is a must for anyone who wants to adapt their mustang to driving in lines that aren't straight. My car is actually a '79 Capri RS with a 351W swap and a fully rebuilt suspension of my own design for both drag racing and drifting. Having this valve not only works well to brake exactly how you want it, on the track conditions that your running, but you can kill a ton of the braking power to the rear to make amazing burnouts without torching your rear brakes. Adapts to the stock brake lines. Ford Racing good quality, and I abuse the tar outta my drifting/drag Capri. I mounted mine before a flow-through hydraulic e-brake and there isn't a difference in the performance of either.

        Helpful (15)

      Questions & Answers (2 answers)

      2 Top Rated Questions

      Coverted to disk on rear, and have a question. I installed a 93 Cobra disk rear on my 88 Mustang. The rear does work, but its seems my fronts are doing 90% of the work, and I would like them to do 60% of the work. Will this help send more pressure to the rear?

      • This Rear Brake Proportioning Valve will not fix your problem. This lets you adjust the rear proportion in the rear brakes, not the front. It seems you may not have the factory proportioning valve installed or in the right position. This can cause more pressure to be applied to the front and not the rear.

      Helpful (1)

      Is this a good replacement for replacing a stock proportioning valve from a 1986 mustang gt?

      • This would be a good upgrade of the OE Proportioning valve.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Proportioning Valve
      • (2) Fittings

      Tech Specs

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