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Re: ALUMINUM MASTER CYLINDER QUESTION??? [Re: moparrush] #54423
02/29/08 02:13 PM
02/29/08 02:13 PM
Joined: Jan 2005
Posts: 1,647
IL
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71383beep Offline
top fuel
71383beep  Offline
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Quote:

This is the non-machined piston that had came with Rick's aluminum piece.




That's what mine looks like!

I hope this is not a problem for power Brakes.

If not what is the Part No. or specs for your auto zone piece so i can perfrom the same upgrade.


'73 GK6 Challenger Rallye - 340 4-Speed
Re: ALUMINUM MASTER CYLINDER QUESTION??? [Re: 71383beep] #54424
02/29/08 02:43 PM
02/29/08 02:43 PM
Joined: Feb 2003
Posts: 8,658
A
Andrewh Offline
master
Andrewh  Offline
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power brakes don't have the retainer rubber, and don't need it. That is not to say you won't see a power master with that groove, as people get sloppy with the kits.
The reason manual brakes need it, is because you can pull the pedal up and pull the push rod out of the master cylinder.
That part does not pull back on a power car because the booster doesn't let you.

Re: ALUMINUM MASTER CYLINDER QUESTION??? [Re: moparrush] #54425
02/29/08 03:00 PM
02/29/08 03:00 PM
Joined: May 2007
Posts: 134
san antonio, Texas
moparrush Offline OP
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moparrush  Offline OP
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Posts: 134
san antonio, Texas
I believe he is right about the power brake issue. Sounds like someone with more experience than I with power brakes. My autozone piece for for a B200 Van from 1985 is what I ordered. My donor piece from the junkyard was from the same vehicle, and since it came factory aluminum, I thought that is what I would get in exchange. When they handed me that steel cast one (and all of them on the shelf were like that) I was bummed, but the one out of the salvage yard didn't work well so that is why I bought that one. The aluminum ones are kinda hard to find and when I saw Rick's ad on here selling these at a pretty reasonable price, I jumped on it.

Re: ALUMINUM MASTER CYLINDER QUESTION??? [Re: moparrush] #54426
02/29/08 03:23 PM
02/29/08 03:23 PM
Joined: May 2007
Posts: 134
san antonio, Texas
moparrush Offline OP
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moparrush  Offline OP
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Posts: 134
san antonio, Texas
Some more food for thought; When measuring from the end of the piston to the bottom of the bore of the pushrod cylinder it is only approximately 1/2" deep. That goes for both pieces that I took the pictures of. That isn't much room for a rod to fall out, or drop out and wedge up against the firewall. I see what Rick is talking about with the early power brake cylinders not having as deep a bore as the one's he sells, but I don't have a multitude of old master cylinders here to check. I still have my original one, before the upgrade, and it has the same bore dimensions (with the machined groove) as the one piece I got from autozone.
My thinking is that if the Chrysler Engineers put it there for a few decades, and on different models of Master Cylinders, than it stands to reason that the retainer, for non-power brake cars, needs to be there! I've read most all of the mopar mags, and have them dating back into the 80's when they first starting publishing them, as well as service manuals, guides, etc... Whatever mopar I read it, but I have never read anywhere that a fix for not having the retainer is to put RTV in it. I might have missed something somewhere along the line, and maybe this is an idea that this is a trick fix that Rick has become aware of, I just have never heard of it myself. As for myself, I have just spent years working to get my car back on the road, and I sure would hate to see all that time, money, and divorces wrapped around a tree because of a $1.00 piece of rubber.

Re: ALUMINUM MASTER CYLINDER QUESTION??? [Re: moparrush] #54427
11/20/08 09:14 PM
11/20/08 09:14 PM
Joined: Jul 2005
Posts: 757
Toronto, Ont, Canada
boydsdodge Offline
super stock
boydsdodge  Offline
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Joined: Jul 2005
Posts: 757
Toronto, Ont, Canada
I have three of Rick's masters and they all have the machined recess for the plastic/rubber retainer.

Re: ALUMINUM MASTER CYLINDER QUESTION??? [Re: 71383beep] #54428
11/20/08 09:55 PM
11/20/08 09:55 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:

Power Brakes pushrod do not need a reatainer? AND Manual Brakes do need a retainer?


correct. EDIT & manual brake MUST have the machined recess & I have compared an oe rubber retainer from chrysler & it's identical to just a piece of vac line ex that the oe one had a slight groove cut lengthwise on the outside.

Last edited by RapidRobert; 11/20/08 10:39 PM.
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