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[GMCnet] Re: Problem with brass body proportioning valve [message #365374 is a reply to message #365372]

Mon, 12 July 2021 10:50

James Hupy

Messages: 6806
Registered: May 2010

Karma:

Senior Member

Because they could not "just pick some part off of another GM brand" to do
that exact job, they went with what was available at the time. Just my best
guess, anyway.
They engineered some weird stuff in the 70's. Ask me about Converted
gasoline engines to diesel, set crosswise on top of the transaxle in the
front end of Olds "C" bodies. You had to remove the motor mount fasteners
to get at the glow plugs and injectors. WHAT A PITA that was.
Jim Hupy
Salem, Oregon

On Mon, Jul 12, 2021, 8:34 AM Bill Van Vlack
wrote:

> James Hupy wrote on Sun, 11 July 2021 23:33
>> The disc brakes require more hydraulic pressure to operate than the drum
>> brakes do. That is why the engineers limited the pressure to the drum
>> brakes. When you have all discs on a coach, there needs to be the same
>> amount of pressure to front and rear, and no delay to the front brakes
> like
>> there is with a combination disc/drum system. Not too complex, really.
>> Jim Hupy
>> Salem, Oregon
>
> That makes sense, but it gets more complex when trying to understand why
> the GMC Motorhome engineers did not do it that way. If I understand Dave
> Lenzi's article correctly, the GMCMH disk/drum coach came with a steel
> combination valve that provided the same amount of pressure to the front and
> rear brakes (after the front brake delay).
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
> _______________________________________________
> GMCnet mailing list
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[Message index]

		Problem with brass body proportioning valve By: Matt Colie on Fri, 09 July 2021 07:59
		Re: Problem with brass body proportioning valve By: JohnL455 on Fri, 09 July 2021 09:22
		Re: Problem with brass body proportioning valve By: Matt Colie on Fri, 09 July 2021 11:07
		Re: Problem with brass body proportioning valve By: JohnL455 on Fri, 09 July 2021 14:07
		Re: Problem with brass body proportioning valve By: blur911 on Fri, 09 July 2021 15:00
		Re: Problem with brass body proportioning valve By: JohnL455 on Fri, 09 July 2021 17:40
		Re: Problem with brass body proportioning valve By: Green machine on Fri, 09 July 2021 23:35
		Re: Problem with brass body proportioning valve By: ebyker on Sat, 10 July 2021 07:43
		Re: Problem with brass body proportioning valve By: MikeB on Sat, 10 July 2021 10:01
		[GMCnet] Re: Problem with brass body proportioning valve By: Thomas Pryor on Sat, 10 July 2021 11:08
		Re: Problem with brass body proportioning valve By: Greg C. on Sat, 10 July 2021 19:05
		Re: Problem with brass body proportioning valve By: Larry on Sat, 10 July 2021 20:24
		Re: Problem with brass body proportioning valve By: Tom Katzenberger on Sat, 10 July 2021 19:38
		Re: Problem with brass body proportioning valve By: Tom Katzenberger on Sat, 10 July 2021 19:40
		Re: Problem with brass body proportioning valve By: Matt Colie on Sun, 11 July 2021 08:15
		Re: Problem with brass body proportioning valve By: Tom Katzenberger on Sun, 11 July 2021 11:16
		Re: Problem with brass body proportioning valve By: JohnL455 on Sun, 11 July 2021 13:33
		Re: Problem with brass body proportioning valve By: Greg C. on Sun, 11 July 2021 19:29
		Re: Problem with brass body proportioning valve By: Bill Van Vlack on Sun, 11 July 2021 23:24
		[GMCnet] Re: Problem with brass body proportioning valve By: James Hupy on Sun, 11 July 2021 23:33
		Re: [GMCnet] Re: Problem with brass body proportioning valve By: Bill Van Vlack on Mon, 12 July 2021 10:34
		[GMCnet] Re: Problem with brass body proportioning valve By: James Hupy on Mon, 12 July 2021 10:50
		Re: Problem with brass body proportioning valve By: wally on Mon, 12 July 2021 11:55
		Re: Problem with brass body proportioning valve By: Matt Colie on Mon, 12 July 2021 19:18
		Re: Problem with brass body proportioning valve By: TR 1 on Mon, 12 July 2021 12:44
		Re: Problem with brass body proportioning valve By: Bill Van Vlack on Mon, 12 July 2021 13:31
		Re: Problem with brass body proportioning valve By: TR 1 on Mon, 12 July 2021 14:34
		Re: Problem with brass body proportioning valve By: Bill Van Vlack on Tue, 13 July 2021 10:14
		Re: Problem with brass body proportioning valve By: Greg C. on Mon, 12 July 2021 17:02
		Re: Problem with brass body proportioning valve By: JohnL455 on Mon, 12 July 2021 17:12
		Re: Problem with brass body proportioning valve By: Greg C. on Mon, 12 July 2021 17:40
		[GMCnet] Re: Problem with brass body proportioning valve By: Thomas Pryor on Thu, 29 July 2021 14:40
		[GMCnet] Re: Problem with brass body proportioning valve By: Billy Massey on Thu, 29 July 2021 15:30
		Re: [GMCnet] Re: Problem with brass body proportioning valve By: Matt Colie on Thu, 29 July 2021 16:39
		Re: Problem with brass body proportioning valve By: JohnL455 on Thu, 29 July 2021 18:57
		Re: Problem with brass body proportioning valve By: Tom Katzenberger on Thu, 29 July 2021 20:53
		Re: Problem with brass body proportioning valve By: Matt Colie on Thu, 29 July 2021 21:55
		Re: Problem with brass body proportioning valve By: Jp Benson on Sat, 31 July 2021 21:19
		Re: Problem with brass body proportioning valve By: Bill Van Vlack on Sun, 01 August 2021 13:10
		Re: Problem with brass body proportioning valve By: Jp Benson on Sun, 01 August 2021 17:24
		Re: Problem with brass body proportioning valve By: Larry on Sun, 01 August 2021 13:03
		Re: Problem with brass body proportioning valve By: Matt Colie on Sun, 01 August 2021 14:37
		Re: Problem with brass body proportioning valve By: Larry on Sun, 01 August 2021 15:06
		Re: Problem with brass body proportioning valve By: blur911 on Sun, 01 August 2021 16:00
		Re: Problem with brass body proportioning valve By: Thomas Pryor on Fri, 17 September 2021 12:38
		Re: Problem with brass body proportioning valve By: Larry on Fri, 17 September 2021 17:49
		Re: Problem with brass body proportioning valve By: blur911 on Sun, 10 October 2021 13:23
		Re: Problem with brass body proportioning valve By: Russell K. on Mon, 11 October 2021 13:14
		[GMCnet] Re: Problem with brass body proportioning valve By: stu@97381.com, Emery on Mon, 11 October 2021 14:43
		[GMCnet] Re: Problem with brass body proportioning valve By: stu@97381.com, Emery on Mon, 11 October 2021 15:55
		[GMCnet] Re: Problem with brass body proportioning valve By: jimk on Mon, 11 October 2021 20:17
		Re: [GMCnet] Re: Problem with brass body proportioning valve By: blur911 on Wed, 03 November 2021 14:39
		[GMCnet] Re: Problem with brass body proportioning valve By: jimk on Wed, 03 November 2021 15:26
		[GMCnet] Re: Problem with brass body proportioning valve By: Thomas Pryor on Tue, 12 October 2021 12:20
		Re: Problem with brass body proportioning valve By: ebyker on Tue, 12 October 2021 14:59

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