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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering> Problem with '74 'Vette master cylinder
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Topic Review (Newest First)
06-05-2011 03:52 PM
T-bucket23 The casting number means nothing in this case as both a manual and power brake MC would have the same casting number. Only one of the internal parts is different.
06-05-2011 08:20 AM
artsvettes New meaning to NARA know how"
06-05-2011 06:18 AM
cobalt327
Quote:
Originally Posted by hduff
All of the m/c sthey had in stock were manual and incorrectly identified as power brake m/cs. The new master cylinders were correct.
Just goes to show you that "defensive parts buying" has to be done even at NAPA, who's considered by many to be a cut above the others.
06-04-2011 09:17 PM
hduff
Quote:
Originally Posted by artsvettes
68-76 corvette master cyl were the same. They changed in 77-82 along with the brake booster. There is a diffrence between manual and power brake master cyl

All of the m/c sthey had in stock were manual and incorrectly identified as power brake m/cs. The new master cylinders were correct.
06-04-2011 08:00 PM
artsvettes 68-76 corvette master cyl were the same. They changed in 77-82 along with the brake booster. There is a diffrence between manual and power brake master cyl
06-02-2011 01:13 PM
hduff Thanks guys. Now that I have an idea of what is wrong at NAPA, I can get things straight.
06-02-2011 08:44 AM
KUHL46
NAPA Master cyl

NAPA numbers may be wrong. I had a similar situation last week. I was looking for a manual master cyl for a Vette. According to their computer they brought in one that had the shallow piston hole for a power booster.
I got the right one from Advance Auto Parts. Their listing was correct
06-02-2011 06:13 AM
Bryan59EC The deep bore is generally for manual brakes

The shallow bore is for power brakes only.

You can purchase an extension rod that will replace the one currently in your booster, or, sometimes there is a plug available for the deep bore that changes it to a shallow bore.

I bought parts froom Classic Performance products to deal with this on a couple of my vehicles-----but the plug seems to only want to work with the masters that they sell.
06-01-2011 07:54 PM
hduff
Quote:
Originally Posted by Henry the 32nd
A master from a 74 Corvette won't work because it would have been disc disc.
I have 4-wheel disc brakes. The leaky m/c is a '74 'Vette.

Sorry I wasn't clear.
My problem is the business end of the m/c.

There's a depression or cup where the pushrod from the brake booster pushes against it.

The "correct" m/c has a shallow depression; the one NAPA keeps trying to give me is about an inch deeper. they say it's the same part, but obviously it's not.
06-01-2011 06:14 PM
Henry the 32nd A master from a 74 Corvette won't work because it would have been disc disc. All corvette's 65 and later are 4 wheel disc, however in 65 they had a 4 wheel drum brake option,giving you money back. If yours has a top like the Corvette perhaps it is from a Camaro?
06-01-2011 03:45 PM
hduff
Problem with '74 'Vette master cylinder

The master brake cylinder on my ride leaks, so I figured it was time to replace it. It's the classic '74 'Vette master cylinder. (the casting number on the body is 29969).

So I went to NAPA, got a reman m/c (with casting number 29969), but it's notteh same part.

The cup where it receives the rod from the vacuum booster is shallow, whereas the replacement part is deep. The other m/c's that NAPA has have a deep cup.

Is this a power/manual brake difference? Am I confused? Is NAPA confused?

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