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#1
05-04-2003, 08:59 PM
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I am looking to buy a used boost/master cylinder to use on a 1967 firebird. It is a drum brake car I am converting to discs. The master cylinders have a 2 letter code on them. Does anyone have a list of the codes for the later model disc brake master cylinders. I know the code for 1967 disc brakes is "WT". I want to make sure I get a disc brake cylinder. Thanks in advance.
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#2
05-04-2003, 08:59 PM
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I am looking to buy a used boost/master cylinder to use on a 1967 firebird. It is a drum brake car I am converting to discs. The master cylinders have a 2 letter code on them. Does anyone have a list of the codes for the later model disc brake master cylinders. I know the code for 1967 disc brakes is "WT". I want to make sure I get a disc brake cylinder. Thanks in advance.
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#3
05-04-2003, 09:43 PM
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Can't the usual parts place like NAPA, Advance, etc... get you the correct unit for the swap?
I did the same thing in that I swaped my 78 TA's master cyl. that was originally a drum brake rear for a disc brake rear's master cyl. from a 79 so equipped TA. Granted, I had to walk them through it, but I got a brand new reman. unit w/ a lifetime warranty. Now proportioning valves are a different story! Call Fine Lines for those and any other brake hardware.  SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY. I Misus Rash'!
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SECOND AMENDMENT: AMERICA'S ORIGINAL HOMELAND SECURITY! |
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#4
05-06-2003, 05:16 AM
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I found your codes on this website - http://1968firebird.org/number/hbc/hbc1.html Codes for 1967 are CT ( one inch bore) and FR( 1 1/8 inch bore). There are many different codes for '68 and '69 with 1 or 1 1/8 inch bores. I hope that helps!
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#5
05-06-2003, 08:35 AM
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879:
Just so you know: You don't HAVE to change your master cylinder. I, and others, have done the conversion without changing the master cylinder. We've had no problems. Just keep an eye on your brake fluid level as your brakes wear. The drum brake master cylinder does not hold as much fluid as the disc brake master cylinder.
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Rick |
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#6
05-07-2003, 09:48 AM
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Thanks to everyone. The '68 firebird link has a lot of good info.
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#7
05-08-2003, 11:12 AM
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I disagree about using a all drum brake master cylinder for a disc/drum application. It is lacking the check valves. Also as you said, the volume of fluid needed is different. Master cylinders are so cheap, there is no reason not to change it to the right one.
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