1969 442 disc brake master cylinder???
March 29th, 2013, 04:03 PM
#1
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1969 442 disc brake master cylinder???
What did the 69 442 disc brake master look like?
Did they use the same master on the manual disc brake cars?
I have seen some 69/HO cars with masters with two retaining straps that I have never seen before is that original to those cars?
Did they use the same master on the manual disc brake cars?
I have seen some 69/HO cars with masters with two retaining straps that I have never seen before is that original to those cars?
March 29th, 2013, 04:23 PM
#2
Old(s) Fart
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March 29th, 2013, 09:11 PM
#6
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[QUOTE=pogo69;526937]
The two bail design is definitely correct for 69 with disc brakes. My car still has the original unit on it.
My (Feb 73) parts book also lists the 69 disc master cylinder as 5468120. I'm surprised it shows a different number (5468774) for '68 w/discs and yet another (5459784) for '67 w/discs. At first glance, they all look the same externally. I've got one off of a '68 in my garage too. I'll have to see if I can figure out what may be different. They also list different bails for the '69 vs. the '67-8 part numbers, although they do show 2 each required for both. They do show the same cover applying to all 3 years. The piston for 68/9 is shared (along with early 70s) with 67 being different.
I have no idea if the "exact" unit is reproduced, but they do make the 2-bail right "looking" units.
My (Feb 73) parts book also lists the 69 disc master cylinder as 5468120. I'm surprised it shows a different number (5468774) for '68 w/discs and yet another (5459784) for '67 w/discs. At first glance, they all look the same externally. I've got one off of a '68 in my garage too. I'll have to see if I can figure out what may be different. They also list different bails for the '69 vs. the '67-8 part numbers, although they do show 2 each required for both. They do show the same cover applying to all 3 years. The piston for 68/9 is shared (along with early 70s) with 67 being different.
I have no idea if the "exact" unit is reproduced, but they do make the 2-bail right "looking" units.
March 29th, 2013, 11:10 PM
#7
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The new look alike will be good for my build. This is the first time I have seen what a original disc brake master looks like. On the west coast hydraulic fluid absorbs moister and masters tend to last only 10 years max.
March 30th, 2013, 06:02 AM
#8
Old(s) Fart
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They are the same on Chevelles, so EVERYBODY is reproducing them. You'll pay a premium for the ones with the correct bleeder screws as shown in the photo I posted. The ones without the bleeder screws work fine, they just don't look 100% correct.
March 30th, 2013, 11:06 AM
#9
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[QUOTE=pogo69;526937]
Always remember: The parts in the parts catalogs are *not* always (and are often enough not) the parts that came on the cars originally. They are parts that GM determined to be "correct replacement" parts, and though functionally correct can vary considerably in appearance.
And only the parts still available at the published date of the catalog are included! Sometimes part numbers being superseded give you a clue that the part is different.
And only the parts still available at the published date of the catalog are included! Sometimes part numbers being superseded give you a clue that the part is different.
Last edited by wmachine; March 30th, 2013 at 11:10 AM.
April 5th, 2013, 08:32 AM
#11
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the casting number previously posted is the same for several applications. the EA on the pad lets you know it's correct for a 69 GM A body (iirc DW is 68 and EB is 70, but thats a single bale design). I might have an original somewhere, not 100%
January 21st, 2016, 10:50 PM
#13
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The two bail design is definitely correct for 69 with disc brakes. My car still has the original unit on it.
My (Feb 73) parts book also lists the 69 disc master cylinder as 5468120. I'm surprised it shows a different number (5468774) for '68 w/discs and yet another (5459784) for '67 w/discs. At first glance, they all look the same externally. I've got one off of a '68 in my garage too. I'll have to see if I can figure out what may be different. They also list different bails for the '69 vs. the '67-8 part numbers, although they do show 2 each required for both. They do show the same cover applying to all 3 years. The piston for 68/9 is shared (along with early 70s) with 67 being different.
I have no idea if the "exact" unit is reproduced, but they do make the 2-bail right "looking" units.
You'd think '67-8 would be the same numbers, with a different one for '69 due to the switch to single-piston calipers. At least the '67-8 numbers are closer together ...
Last edited by BangScreech4-4-2; January 21st, 2016 at 10:52 PM.
January 24th, 2016, 09:08 AM
#16
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casting numbers dont always match part numbers either
if you buy a repop..do some research..theres pages saying whos good and whats junk
i had a friend that went thru 3 before it would bleed and work..the other two where chinese junk and had lots of shavings etc..the bleeders on the master are the better type...
if you buy a repop..do some research..theres pages saying whos good and whats junk
i had a friend that went thru 3 before it would bleed and work..the other two where chinese junk and had lots of shavings etc..the bleeders on the master are the better type...
January 26th, 2016, 12:26 PM
#17
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I am planning to do the disc brake conversion using 72 GM parts, replace the MC, keep my old drum brake distribution block, and add an adjustable proportioning/balance valve.
Can I use the disc/drum MC for a 72 Monte Carlo (will it fit my 68 Olds)? According to the Napa website, it has a 1/2-20 primary and 9/16-18 secondary, which is the same as my existing 1968 drum/drum MC.
Can I use the disc/drum MC for a 72 Monte Carlo (will it fit my 68 Olds)? According to the Napa website, it has a 1/2-20 primary and 9/16-18 secondary, which is the same as my existing 1968 drum/drum MC.
January 26th, 2016, 02:17 PM
#19
Old(s) Fart
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I am planning to do the disc brake conversion using 72 GM parts, replace the MC, keep my old drum brake distribution block, and add an adjustable proportioning/balance valve.
Can I use the disc/drum MC for a 72 Monte Carlo (will it fit my 68 Olds)? According to the Napa website, it has a 1/2-20 primary and 9/16-18 secondary, which is the same as my existing 1968 drum/drum MC.
Can I use the disc/drum MC for a 72 Monte Carlo (will it fit my 68 Olds)? According to the Napa website, it has a 1/2-20 primary and 9/16-18 secondary, which is the same as my existing 1968 drum/drum MC.
January 28th, 2016, 09:35 AM
#20
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Correction - my existing MC has 9/16 primary and 1/2 secondary. I am going to Napa to see if they have a disc/drum that matches.
The newer square MC has an obviously larger front reservoir. I assume this is for convenience (so you don't have to add fluid as the pads wear) versus performance?
The newer square MC has an obviously larger front reservoir. I assume this is for convenience (so you don't have to add fluid as the pads wear) versus performance?
January 28th, 2016, 12:00 PM
#21
Old(s) Fart
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Correction - my existing MC has 9/16 primary and 1/2 secondary. I am going to Napa to see if they have a disc/drum that matches.
The newer square MC has an obviously larger front reservoir. I assume this is for convenience (so you don't have to add fluid as the pads wear) versus performance?
The newer square MC has an obviously larger front reservoir. I assume this is for convenience (so you don't have to add fluid as the pads wear) versus performance?
Yes, the front reservoir is larger to accommodate the fact that as the disk pads wear, the piston stays further out of the caliper and thus needs more fluid.
Matching the port sizes is the least of your problems. You do realize that you need either a metering valve or a combo valve, right? Either of these will require some replumbing.
March 27th, 2017, 10:54 AM
#22
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If EA is for a 69 A body, What is one with a DC stamping supposed to fit??
March 27th, 2017, 12:12 PM
#23
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A quick search shows DC (509) is for 1967 'vette PS or manual and 68-72 'vette manual. I'm not sure if it's different than an Olds master, but I think vettes have like a deeper hole where the pushrod goes.
March 27th, 2017, 06:21 PM
#24
Gary
Join Date: Feb 2014
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The Corvette Master has been reproduced for many years and looks very different from Oldsmobile masters (both front and rear fluid capacity is identical and the unit has a rounder look--no vertical sides).
March 27th, 2017, 09:01 PM
#25
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I found 5468309 on https://www.camarocentral.com/1967_1..._p/brc-147.htm
March 27th, 2017, 10:52 PM
#26
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I took a better look at the master I have and it has a number on the right side it's 5455509. I thought it was the original to my Olds but I guess it isn't
March 28th, 2017, 09:16 AM
#27
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[QUOTE=pogo69;526937]
According to my parts book Feb'70 print: '69 F-85 Disc Brakes pt.#5468120 Moraine.
My 1969 442 came with factory disc brakes and it still had the factory master cylinder which had two bails for the cap.
I remember a lot of Corvette guys asking if I would sell it.
According to my parts book Feb'70 print: '69 F-85 Disc Brakes pt.#5468120 Moraine.
My 1969 442 came with factory disc brakes and it still had the factory master cylinder which had two bails for the cap.
I remember a lot of Corvette guys asking if I would sell it.
March 28th, 2017, 09:23 AM
#28
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20 years ago...before all these repro masters were available, I remember using a vette master cylinder on my 442 because I wanted the "look", and it was the closest available. I remember I changed the primary piston because it was different. 'Course it was changed again later over time to the correct piece.
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