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'74 power brake conversion

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Old Mar 9, 2012 | 11:12 AM
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Default '74 power brake conversion

Looking info for the brake line change reason. I found vendors say that to change to power I need to change all the lines to stanless. Is the factory lines installed different from standard to power? What happen in that rare instance that a dealer back in the '70s wished to convert. Any reasoning is welcome. Just looking to avoid removing lines that are not rotted.
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Old Mar 9, 2012 | 11:45 AM
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No Corvette came from the factory with stainless lines, either brake or fuel. I wouldn't use them on any car I was building. Bog-standard TBW (plated) lines are all you need.

Just for fun, can you post a link to the vendor that says you 'must' use S/S?
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Old Mar 9, 2012 | 01:14 PM
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Originally Posted by Mike Ward
No Corvette came from the factory with stainless lines, either brake or fuel. I wouldn't use them on any car I was building. Bog-standard TBW (plated) lines are all you need.

Just for fun, can you post a link to the vendor that says you 'must' use S/S?

I would love to hear who this vendor is.
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Old Mar 9, 2012 | 04:07 PM
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Originally Posted by YANKEECORVETTE
...Is the factory lines installed different from standard to power?...
No.

...What happen in that rare instance that a dealer back in the '70s wished to convert...
Convert to what? Standard to power? He/she probably pulled out the AIM or the chassis service manual and followed the diagrams.

Order the assembly instruction manual (AIM) for your model year. The AIM shows how the optional factory power brake system was installed. All the parts you will need are listed. AIM shows the additional holes you will need in the firewall.


Last edited by Easy Mike; Mar 10, 2012 at 08:58 AM.
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Old Mar 9, 2012 | 04:19 PM
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Corvette Central Optional stainless
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Old Mar 9, 2012 | 06:38 PM
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http://www.corvettepartscatalog.com/...oducts_id=1463

I did not mean it had to be stainless ,but here one of 4 vendors who gives a option of other than steel.
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Old Mar 9, 2012 | 07:45 PM
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All the vendors sell S/S lines in addition to the original TBW lines, doesn't mean that it's a good idea or even an upgrade.
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Old Mar 10, 2012 | 10:42 AM
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Let me start over. Does anyone know if I can replace the master cylinder on a '74 corvette that has no power brakes with a vacuum booster and the correct master cylinder for that year, to have power brakes, without changing the factory brake lines? yes I can or not advised for "what Reason" I have ordered a factory assembly manual, I hoped to get a fast answer backed up with some facts.Like size the of diameter of the lines, wall thickness, type of steel that may have been used or some technical fact.
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Old Mar 10, 2012 | 10:58 AM
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The only lines you need to change, and simply because they are a different shape, are the two connecting the master cylinder to the distribution valve.

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Old Mar 10, 2012 | 12:07 PM
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Originally Posted by Mike Ward
The only lines you need to change, and simply because they are a different shape, are the two connecting the master cylinder to the distribution valve.

Yes. What he said.
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Old Mar 10, 2012 | 06:53 PM
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Auto or manual trans?I have a new booster and a used brake pedal(correct pivot point) for an automatic if you are interested,$100+shipping...

Last edited by tfi racing; Mar 10, 2012 at 07:00 PM.
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Old Mar 11, 2012 | 10:21 AM
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Originally Posted by YANKEECORVETTE
...I have ordered a factory assembly manual...
Best move you can make. Wait for the AIM arrive, then thumb through the power brake sections.

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Old Mar 11, 2012 | 11:24 AM
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Its a stick thanks any ways, very much
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Old Mar 11, 2012 | 11:28 AM
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To Mike Ward a" BIG THANK YOU" thats what I wanted to hear.
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