| Original Master Cylinder - How to identify? [message #308978] |
Tue, 18 October 2016 08:54  |
jcurran
Messages: 52
Registered: May 2009
Karma: 0
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Hi Folks,
Does anyone know how to determine if a master cylinder is original?
Also, when putting brake lines together should there be any kind of thread sealant or just metal to metal?
Thanks,
Jim
Jim Curran
1976 Palm Beach
Alexandria, OH
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| Re: [GMCnet] Original Master Cylinder - How to identify? [message #308988 is a reply to message #308978] |
Tue, 18 October 2016 09:51  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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I don’t know if there are markings on the master cylinder, and if you would be able to tell.
You can see if it’s an original type part.
Also, flared fitting create their own seal.
I have a power bleeding kit. Let me know if you want me to bring it by.
Dolph
DE N8JPC
Wheeling, West Virginia
1977 26’ ex-PalmBeach
1-Ton, Sullybilt Bags, Reaction Arms, 3.70 LSD, Manny Transmission, EV-6010
“The Aluminum and Fiberglass Mistress"
> On Oct 18, 2016, at 9:54 AM, Jim Curran wrote:
>
> Hi Folks,
> Does anyone know how to determine if a master cylinder is original?
>
> Also, when putting brake lines together should there be any kind of thread sealant or just metal to metal?
>
> Thanks,
> Jim
>
> --
> Jim Curran
> 1976 Palm Beach
> Alexandria, OH
>
> _______________________________________________
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| Re: Original Master Cylinder - How to identify? [message #308996 is a reply to message #308978] |
Tue, 18 October 2016 11:23 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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jcurran wrote on Tue, 18 October 2016 09:54Hi Folks,
Does anyone know how to determine if a master cylinder is original?
Also, when putting brake lines together should there be any kind of thread sealant or just metal to metal?
Thanks,
Jim
Jim,
As a resident of a rust-belt state. Do yourself and the next owner a favor.
As you will be doing a flush and bleed with the master cylinder change, take the time to get new rubber caps for all the bleed screws (6). And while you are messing with it, take each bleed screw out and clean it and wrap it with teflon tape. This is not for system sealing. It is to keep:
A - The road water from getting in to the threads of the bleed screw and corroding them, and
B - The brake fluid leaked during bleeding from getting in to the threads of the bleed screw and corroding them.
I started doing this about 30 years ago and have not broken a bleed screw that was so treated yet. (I was using pipe dope, but Chuck Boyd suggested the teflon tape and it works even better.)
While the system sealing is all done by the flare, a coat of anti-seize or pipe dope on the line nut threads will simply make life easier for someone else done the road.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Original Master Cylinder - How to identify? [message #309029 is a reply to message #308978] |
Tue, 18 October 2016 23:58 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Most brake fittings fit in a way to where you do not use sealants.
Should you have problems, you can use a flared copper washer to create a
better seal.
On Tue, Oct 18, 2016 at 6:54 AM, Jim Curran wrote:
> Hi Folks,
> Does anyone know how to determine if a master cylinder is original?
>
> Also, when putting brake lines together should there be any kind of thread
> sealant or just metal to metal?
>
> Thanks,
> Jim
>
> --
> Jim Curran
> 1976 Palm Beach
> Alexandria, OH
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Original Master Cylinder - How to identify? [message #309036 is a reply to message #308978] |
Wed, 19 October 2016 06:47 |
jcurran
Messages: 52
Registered: May 2009
Karma: 0
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Thanks for the pointers, guys.
Dolph your generosity never seems to end. Looking forward to showing you my paint job.
FWIW the only marks I can see now are on the left side, as the cylinder is mounted:
614003 or 614009.
LOTS of surface rust which is what has me wondering if it is original. In any case it is getting replaced.
Jim
Jim Curran
1976 Palm Beach
Alexandria, OH
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| Re: Original Master Cylinder - How to identify? [message #309038 is a reply to message #308978] |
Wed, 19 October 2016 10:09 |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Senior Member |
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If you haven't already you may look to Dave Lenzi for a new Master, He machines the mounting ears so the nuts have enough threads to provide a proper bite.
I got mine from him along with a sensitized booster and push rod and am very very happy with the results.
http://www.bdub.net/lenzi/
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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