Brake proportional valve for 1974 VEGA

Asked by Guru9RNP55 Aug 06, 2022 at 02:31 PM about the 1974 Chevrolet Vega

Question type: Maintenance & Repair

Hi, does anyone know of the correct brake proportional valve (part #?
supplier?) to fit a 1974 Chevy VEGA, 2.3L????

Guru9RNP55 answered about a year ago

I'll answer my own question. It is a "distribution block" GM #3980762 (discontinued) from the 68-75 GM Chevrolet parts manual (which you can find free online, pdfcoffee.com). Aftermarket PV05, but superceded by PR109 (also for 67-69 Camaro) and PR110 (for 70-74 Nova). I got a PR109 but one port was not the same size and the shop has to use adapter connection and run a new line to rear. There is also a PR110 (for 70-74 Nova), might be the better fit (??). I suggest you check the port sizes for both with the supplier and match to original.

Mark helpful

Guru9RNP55 answered about a year ago

I'll answer my own question. It is a "distribution block" GM #3980762 (discontinued) from the 68-75 GM Chevrolet parts manual (which you can find free online, pdfcoffee.com). Aftermarket PV05, but superceded by PR109 (also for 67-69 Camaro) and PR110 (for 70-74 Nova). I got a PR109 but one port was not the same size and the shop has to use adapter connection and run a new line to rear. There is also a PR110 (for 70-74 Nova), might be the better fit (??). I suggest you check the port sizes for both with the supplier and match to original.

Mark helpful

Guru9RNP55 answered about a year ago

I'll answer my own question. It is a "distribution block" GM #3980762 (discontinued) from the 68-75 GM Chevrolet parts manual (which you can find free online, pdfcoffee.com). Aftermarket PV05, but superceded by PR109 (also for 67-69 Camaro) and PR110 (for 70-74 Nova). I got a PR109 but one port was not the same size and the shop has to use adapter connection and run a new line to rear. There is also a PR110 (for 70-74 Nova), might be the better fit (??). I suggest you check the port sizes for both with the supplier and match to original.

Mark helpful

Guru9RNP55 answered about a year ago

I'll answer my own question. It is a "distribution block" GM #3980762 (discontinued) from the 68-75 GM Chevrolet parts manual (which you can find free online, pdfcoffee.com). Aftermarket PV05, but superceded by PR109 (also for 67-69 Camaro) and PR110 (for 70-74 Nova). I got a PR109 but one port was not the same size and the shop has to use adapter connection and run a new line to rear. There is also a PR110 (for 70-74 Nova), might be the better fit (??). I suggest you check the port sizes for both with the supplier and match to original.

Mark helpful

Guru9RNP55 answered about a year ago

I can answer my own question now. GM part #3980762 from the 68-75 GM Chevrolet parts manual (find pdf free on internet), discontinued. Aftermarket part PV05, superseded by PR109 (also for 67-69 Camaro). I had a PR109 installed, and one port was different size so the shop had to use an adapter connector. There is also a PR110 (70-74 Nova) and maybe this is the right one (???). Check port sizes with supplier and see which part best matches the original.

Mark helpful

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