Used C5ZZ 2B091 B Disc Brake Proportioning Valve

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "magmustangs" with a Buy-It-Now of $299.00:

1965 1966 Mustang GT Shelby Thunderbird ORIG K/H DISC BRAKE PROPORTIONING VALVE | eBay

-Fred-

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "natesclassiccars" with a Buy-It-Now of $525.00:

For Sale is an Original 1965 - 1966 Ford Shelby GT350 Kelsey Hayes Brake Proportioning Valve. Good Original Condition and Fit. Great for Concours Cars and Restorations. Feel Free to Ask Questions.

Original 1965 1966 Ford Shelby GT350 Kelsey Hayes Brake Proportioning Valve | eBay

-Fred-

Quote from C6ZZKGT

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "natesclassiccars" with a Buy-It-Now of $525.00:

For Sale is an Original 1965 - 1966 Ford Shelby GT350 Kelsey Hayes Brake Proportioning Valve. Good Original Condition and Fit. Great for Concours Cars and Restorations. Feel Free to Ask Questions.

Original 1965 1966 Ford Shelby GT350 Kelsey Hayes Brake Proportioning Valve | eBay

-Fred-

This used C5ZZ 2B091 B disc brake proportioning valve sold October 23, 2023 on Ebay for $525.00.

-Fred-

Quote from C6ZZKGT

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "magmustangs" with a Buy-It-Now of $299.00:

1965-1966 Ford Mustang GT, Fastback, Coupe, Convertible, Shelby GT350, Ford Thunderbird. DISC BRAKE PROPORTIONING VALVE ... This is an ORIGINAL FORD PART. Cast KELSEY HAYES and 56653 on the side. Removed from a 66 Mustang GT with Factory Disc Brakes.. This Proportioning Valve is in Good Condition, Working Condition Unknown. Don't expect it to work without a rebuild. It has rust pitting. No readable date code. The Fitting Threads look good. No cracks or visible damage. . Overall, this is a Good Original Disc Brake Proportioning Valve. VERY HARD TO FIND ORIGINAL. .. Please email with questions. 051418-13DP WE HAVE AN EBAY STORE WITH THOUSANDS OF ORIGINAL FORD PARTS... CHECK IT OUT..

1965 1966 Mustang GT Shelby Thunderbird ORIG K/H DISC BRAKE PROPORTIONING VALVE | eBay

-Fred-

The listing for this used C5ZZ 2B091 B disc brake proportioning valve was ended by the seller November 5, 2024 with the following explanation "the item is no longer available".

-Fred-

Quote from C6ZZKGT

Quote from C6ZZKGT

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "magmustangs" with a Buy-It-Now of $299.00:

1965-1966 Ford Mustang GT, Fastback, Coupe, Convertible, Shelby GT350, Ford Thunderbird. DISC BRAKE PROPORTIONING VALVE ... This is an ORIGINAL FORD PART. Cast KELSEY HAYES and 56653 on the side. Removed from a 66 Mustang GT with Factory Disc Brakes.. This Proportioning Valve is in Good Condition, Working Condition Unknown. Don't expect it to work without a rebuild. It has rust pitting. No readable date code. The Fitting Threads look good. No cracks or visible damage. . Overall, this is a Good Original Disc Brake Proportioning Valve. VERY HARD TO FIND ORIGINAL. .. Please email with questions. 051418-13DP WE HAVE AN EBAY STORE WITH THOUSANDS OF ORIGINAL FORD PARTS... CHECK IT OUT..

1965 1966 Mustang GT Shelby Thunderbird ORIG K/H DISC BRAKE PROPORTIONING VALVE | eBay

-Fred-

The listing for this used C5ZZ 2B091 B disc brake proportioning valve was ended by the seller November 5, 2024 with the following explanation "the item is no longer available".

-Fred-

This used C5ZZ 2B091 B disc brake proportioning valve that was "no longer available" is back on Ebay agian with the same Buy-It-Now of $299.00:

1965 1966 Mustang GT Fastback Coupe Conv ORIG K/H DISC BRAKE PROPORTIONING VALVE | eBay

-Fred-

Here is another Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "magmustangs" with a Buy-It-Now of $549.00:

1965-1966 Ford Mustang GT, Fastback, Coupe, Convertible. DISC BRAKE PROPORTIONING VALVE ... This is an ORIGINAL FORD PART. Cast KELSEY HAYES and 56653 on the side. Date Stamped 2045 on the end. Removed from a 66 Mustang GT Fastback with Factory Disc Brakes. This Proportioning Valve is in Great Condition. I believe it would be useable as-is but strongly recommend a rebuild. I wouldn't expect it to work without a rebuild. No major rust or heavy pitting. The Fitting Threads look good. No cracks or visible damage. Overall, this is a Great Original Disc Brake Proportioning Valve. IMPOSSIBLE TO FIND ORIGINAL.

1965 1966 Mustang GT Fastback Convertible ORIG KH DISC BRAKE PROPORTIONING VALVE | eBay

-Fred-

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "kdrop" with a Buy-It-Now of $175.00:

This is an original Kelsey Hayes adjustable brake proportioning valve. It was removed several years ago from a 1965 or 1966 Mustang. It has had the lines pinched off and was glass beaded at the time. I am selling it as a used part that should be rebuilt.

1965 1966 Mustang Disc Brake Proportion Valve Shelby GT350 Kelsey Hayes GT Hipo | eBay

-Fred-

Quote from C6ZZKGT

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "kdrop" with a Buy-It-Now of $175.00:

This is an original Kelsey Hayes adjustable brake proportioning valve. It was removed several years ago from a 1965 or 1966 Mustang. It has had the lines pinched off and was glass beaded at the time. I am selling it as a used part that should be rebuilt.

1965 1966 Mustang Disc Brake Proportion Valve Shelby GT350 Kelsey Hayes GT Hipo | eBay

-Fred-

This used C5ZZ 2B091 B disc brake proportioning valve sold March 28, 2026 on Ebay for $175.00.

-Fred-

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "rbwiii" with a Buy-It-Now of $400.00 or make offer:

1965 1966 Shelby Mustang GT Kelsey Hayes Proportioning Valve 289 HiPo

Good restorable condition

1965 1966 Shelby Mustang GT Kelsey Hayes Proportioning Valve 289 HiPo | eBay

-Fred-

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "clivecars" with a Buy-It-Now of $123.94:

1965-66 Mustang GT Kelsey Heyes Proportioning Valve Parts.. Condition is "For parts or not working". What you see is what you get, missing piston but otherwise complete.

1965-66 Mustang GT Kelsey Heyes Proportioning Valve Parts. | eBay

-Fred-

Quote from C6ZZKGT

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "rbwiii" with a Buy-It-Now of $400.00 or make offer:

1965 1966 Shelby Mustang GT Kelsey Hayes Proportioning Valve 289 HiPo

Good restorable condition

1965 1966 Shelby Mustang GT Kelsey Hayes Proportioning Valve 289 HiPo | eBay

-Fred-

This used C5ZZ 2B091 B disc brake proportioning valve sold April 11, 2026 on Ebay for $400.00.

-Fred-

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "mustangmasters428" with a starting bid of $195.00:

Here we have a really nice original 1965-66 Mustang Shelby or 66 67 Fairlane Disc Brake Proportioning Valve. This C5ZZ-2B091-B Factory part was outsourced through Kelsey Hayes a well know supplier of high end 4 piston caliper brakes. This part allows equal brake pressure to all wheels since the disc are far more functional in stopping than the stock drum brakes. This is a necessary piece of the Kelsey Hayes inspired disc brake kit & was used primarily on the GT & the Hipo 289 or K code cars. We might note that Ford used these valves on several of their cars because of the quality & functionality. A high performance part to get the job done right !!

This nice clean original piece is not modified & has damage free threads. As the pictures show there is very little patina as a matter of fact there's actually enough to make it look original to your car. The internals have been recently replaced and while the term rebuilt might apply to it's condition, we offer no warranty or guarantee as we do not want that responsibility. A good clean unmodified piece which is not abused and ready to be inspected to meet your standards. You will find it moves freely and it is not tightened to factory specifications as these require adjustment so you will need to adjust it to your braking needs as there are easy on line instructions.

1965-1966 FORD MUSTANG SHELBY BRAKE PROPORTIONING VALVE C5ZZ-2B091-B Nice Inside | eBay

-Fred-

Quote from C6ZZKGT

Here is an Ebay auction for a used C5ZZ 2B091 B disc brake proportioning valve by Ebay member "mustangmasters428" with a starting bid of $195.00:

Here we have a really nice original 1965-66 Mustang Shelby or 66 67 Fairlane Disc Brake Proportioning Valve. This C5ZZ-2B091-B Factory part was outsourced through Kelsey Hayes a well know supplier of high end 4 piston caliper brakes. This part allows equal brake pressure to all wheels since the disc are far more functional in stopping than the stock drum brakes. This is a necessary piece of the Kelsey Hayes inspired disc brake kit & was used primarily on the GT & the Hipo 289 or K code cars. We might note that Ford used these valves on several of their cars because of the quality & functionality. A high performance part to get the job done right !!

This nice clean original piece is not modified & has damage free threads. As the pictures show there is very little patina as a matter of fact there's actually enough to make it look original to your car. The internals have been recently replaced and while the term rebuilt might apply to it's condition, we offer no warranty or guarantee as we do not want that responsibility. A good clean unmodified piece which is not abused and ready to be inspected to meet your standards. You will find it moves freely and it is not tightened to factory specifications as these require adjustment so you will need to adjust it to your braking needs as there are easy on line instructions.

1965-1966 FORD MUSTANG SHELBY BRAKE PROPORTIONING VALVE C5ZZ-2B091-B Nice Inside | eBay

-Fred-

This used C5ZZ 2B091 B disc brake proportioning valve received no bids by May 24, 2026 and therefore did NOT sell.

-Fred-

Quote from 6T09KGT

Buyer beware, Mustang Masters and Fast Freddy have a reputation so always do your homework.

A 292-5 dated valve would not have the internals this one does. The hex bolt on the front was from an earlier version typically found on T-birds.

From their word salad posting, "This nice clean original piece is not modified & has damage free threads. As the pictures show there is very little patina as a matter of fact there's actually enough to make it look original to your car. The internals have been recently replaced and while the term rebuilt might apply to it's condition, we offer no warranty or guarantee as we do not want that responsibility."

From the limited internal view, I suspect this would need a sleeve to address pitting/leaking. The missing band to cover the weep hole must be unmodified patina.

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Thank you for your excellent notation on this valve.

-Fred-