CRG Discussion Forum
Camaro Research Group Discussion => Restoration => Topic started by: onebad34 on August 30, 2008, 02:07:40 AM
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I have a dilema, We are still attempting to finish up the breakes on this camaro. We are on our third mastercylinder, the first two would not build pressure. We have now received another one, but for some reason beyond my knowledge, the size of the ports are reversed. On the first two the larger fitting was on the back and the smaller fitting was on the front. The first two fit and plumbed up to the correct lines on the car. This new one the size of the fittings are reversed. The casting no. is 5460346 with a wt code. Should be correct. Any info is needed. thanks in advance Pete
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Seems strange that you would've had 2 in a row that wouldn't build pressure. I'm gonna ask a dumb question, because you don't provide many details, but did you bench bleed them before install ? If these are Auto Zone/Checker/NAPA rebuilds the third one may have been assembled incorrectly.
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The First two I purchases from Heartbeat City. The first one I installed on the car and It leaked fluid out the back. Called and they sent another one. Bled it on the bench and installed. It would push fluid but would not build pressure. Took off car and disassembled and found the tubing used to sleeve had a seam. Took the first one apart and it also was sleeved with seamed tubing. They did not have another one. sent back. Met individual at Carlisle from Correct Systems and he sent me a master cylinder with the casting no of 5460346 with a WT stamp on the front. He stated he bench bled and it works fine. I did not bench bleed this one, installed on the car and when I went to hook up the lines, noticied the port sizes were reversed. This one has the larger fitting on the front and the smaller on the back. Opposite of the first two, which My lines did hook up to. I notified indiv. and am waiting for a response. I was trying to verify the correct casting no for a 67 camaro, power disc/drum brake car. Any info will be appreciated. Pete
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Wow.....that's an eye opener about Heartbeat. I can't believe anyone would sell a high risk part like that. :o
I can't help on the original part number. I know I've seen posts about them. If the guru's don't respond here, maybe try Team Camaro. Lots more traffic and many of the same people from here over there. I bought my rebuilt MC at Auto- Zone, but it is just 4 wheel drum. Paid $10.00 and have had it on a year now with no issues. You might want to check them out for the disc/drum MC.
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From the "Chassis/Brake System" report:
Master Cylinders
1967-69 Camaros used Delco Moraine master cylinders. The casting number is on the the side or the bottom of the master cylinder.
67-69 manual drum brake cars used the 5452310 casting except 1967 cars with manual J65 brakes used the 5461862 casting. Power drum brake cars used the 5460465 casting.
1967 manual disc brake cars used the 5459467 master cylinder casting. 1967 and 1968 power disc brake cars used the 5460346 master cylinder. Early 1969 disc brake cars also used the 5460346 master cylinder (for about a month or so of production) with later 69 cars using the 5468309 casting.
Power drum and power disc brake master cylinders were installed at an angle and trapped air in the bores of the master cylinder. Bleeder valves were installed to allow this air to be purged from the system. The manual disc brake master cylinders were installed horizontally and did not have bleeder valves. We believe the manual drum master cylinders also did not have bleeders, but there is some conflicting data and this is still being researched.
The application code for the master cylinder was stamped on a small pad on the front of the casting, as shown in the sketch below. Note the tag with the broadcast code also shown in the sketch. The broadcast code and the master cylinder application code are not the same; the broadcast code is for the entire assembly and the application code is for the bare master cylinder.
1969 J52 disc brakes and JL8 four wheel disc brakes both used the US-stamped master cylinder. The only difference was the J52 master cylinder had a check valve in the outlet for the rear drum brakes, whereas the JL8 master cylinder did not have any check valves.
1967-69 Camaro Master Cylinder Codes
1967 1968 1969 Bore Size
---- ---- ---- ----
Manual drums * BS/CT BS BS 1"
Power drums * BS BS BS/CT 1"
Manual J65 drums AU - - 7/8"
Power J65 drums ? - - 1"
Manual discs AD - - 1"
Power discs WT WT US 1 1/8"
* Most drum brake master cylinders are coded BS. But a limited number have been observed with the CT code, in both manual and power drum applications. It is unknown why the CT part was used (possibly a substitute during a parts shortage?) and if there are any differences between the BS and CT master cylinders. The CT code is shown in the applications observed so far.
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Wow, cool Steve. That's all right up there in the red rectangle ?? Maybe that's where I saw it and didn't remember. Sooooooooo much info in there... :D
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Thanks Steve, That is exactly the info I was looking for. Again thanks Pete
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That's all on the site at: http://www.camaros.org/suspen.shtml#Brakecomp
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Did the 5460346 wt use the check valve on each outlet under brass seats?
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Did the 5460346 wt use the check valve on each outlet under brass seats?
Only the output to the rear drums was the check valve used.
Mike
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That's all on the site at: http://www.camaros.org/suspen.shtml#Brakecomp
Yea, that's what I said up front. From the "Chassis/Brake System" report:
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Ok I see that now Steve. I read those posts but still missed it.
The 5460346 wt that was used on the corvette would not have the
Check then right. I guess it could be installed if this was used on 1st gen?
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Bc69
I was really responding to Kurt's comment.
I believe any master cylinder port would need a RPV if that particular line was feeding a drum brake cylinder. Necessary to keep some back pressure for it to work properly.
Steve
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But my question was can it be added to one if not there?
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You mean the RPV. Sure, you would just pull the brass seat and put it in. You would need to install a spring as well under the RPV and a new seat.
Steve
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I have been searching for an orig wt Steve and one I have found is off a corvette.
My understanding is that they are the same other than the use of the RPV. That's why I am
Inquiring about application.