| Re: [GMCnet] Need help identifying this part? [message #326843 is a reply to message #326840] |
Thu, 07 December 2017 11:07   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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David, it serves as an inlet for the fluid from BOTH reservoirs of the
master cylinder, and an outlet point for both the front brakes, and the
rear brakes while keeping them separated hydraulically. Valving in the
original valves serves to prevent application of the front brakes until the
rear drum pressure reaches the set point of the internal spring. Then, the
fluid pressure is released to the front brakes. With an all disc system,
this feature is not necessary.
Jim Hupy
On Dec 7, 2017 8:47 AM, "Rob Mueller" wrote:
> David,
>
> See the text under this photo for what's in the Maintenance Manual X-7525:
>
> http://www.gmcmhphotos.com/photos/combination-valve/
> p59582-combination-valve.html
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of David
> Shafer
> Sent: Thursday, December 7, 2017 10:23 AM
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Need help identifying this part?
>
> Jim.
> When I read up on this valve some time ago I concluded that there are only
> two uses of it instead of the three often stated. Note
> this quote from a link off Manny's site (spelling errors are theirs):
>
> "The original brake combinaton valve installed in our coaches peforms two
> functions: it activates a warning light in the dash if
> there is unequal pressure between the front and rear brakes such as if
> there's a fluid leak on one side, and it includes a metering
> valve to delay the front disc brakes so they don't engage before the slow
> rear drum brakes"
>
> Those who have all disks are also warned that the old valve needs mods to
> the metering part for that application. That leaves only
> one uses of the valve... a warning light.
>
> I do highly regard your posts... maybe I am about to learn something.
>
> Dave
> --
> 1977 26 foot 403
>
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