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[C2] Power Brake Question - 65 Coupe

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Old 06-19-2018, 10:10 PM
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99Silverbullet
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Default Power Brake Question - 65 Coupe
I’m in the middle of a restoration and currently installing the brake system. When I purchased the car it had a stock style power brake booster installed but no proportional valve. Does the car need one?

The brake lines that I ordered specific for the car going to the master are a different fitting than the opening in the master cylinder.

wondering if I need the proportional valve or
just find an adapter fitting that will work.

Anything I find is telling me only the 67 had the proportional valve.

thanks!

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Old 06-19-2018, 10:19 PM
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Originally Posted by 99Silverbullet
I’m in the middle of a restoration and currently installing the brake system. When I purchased the car it had a stock style power brake booster installed but no proportional valve. Does the car need one?

The brake lines that I ordered specific for the car going to the master are a different fitting than the opening in the master cylinder.

wondering if I need the proportional valve or
just find an adapter fitting that will work.

Anything I find is telling me only the 67 had the proportional valve.

thanks!

The 1967 "proportioning valve" you mentioned is just a plain old pressure differential block to tell if the front or rear brake circuits failed. It is not a proportioning valve. You DO NOT require one on your 1965 car.......whether it has disc brakes (standard) or drum brakes (brake delete credit).

If your master cylinder is not a DELCO original unit, it may take different connections. NAPA and others sell conversion connectors/adapters.

Larry
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Old 06-19-2018, 10:21 PM
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Thanks that what I needed to know.
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Old 06-19-2018, 10:31 PM
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Originally Posted by 99Silverbullet

The brake lines that I ordered specific for the car going to the master are a different fitting than the opening in the master cylinder.

just find an adapter fitting that will work.
1965 was a split year. At the beginning of production, cars with power brakes used 3/16". Later in the year, the master cylinder and lines were changed to 1/4". The 1/4" lines were also used on 66's with power brakes.

Which brake lines did you buy? It sounds like you may have gotten the wrong line set.
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Old 06-19-2018, 11:15 PM
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Originally Posted by gbvette62
1965 was a split year. At the beginning of production, cars with power brakes used 3/16". Later in the year, the master cylinder and lines were changed to 1/4". The 1/4" lines were also used on 66's with power brakes.
That's partially correct. Early production 65's used a main cyl with small outlets and 3/16" lines. Later 65 used a 66 style main cyl with larger outlets that required an adapter fittings for the small 3/16" lines.

66 was the beginning of 1/4" brake lines.
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Old 06-20-2018, 12:00 AM
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I already have the fittings to make it work.

thanks
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