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[GMCnet] Re: Problem with brass body proportioning valve [message #365365 is a reply to message #365364]

Sun, 11 July 2021 23:33

James Hupy

Messages: 6806
Registered: May 2010

Karma:

Senior Member

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

On Sun, Jul 11, 2021, 9:24 PM Bill Van Vlack
wrote:

> Greg C. wrote on Sun, 11 July 2021 19:29
>> John, thanks for addressing my question. Just so I am clear, in reading
> your reply it looks like my combination valve does have a proportioning
>> component, but it provides the pressure applied to the rear brakes as a
> predetermined fraction of pressure applied to the front discs, in order to
>> prevent premature rear wheel lock up.
>>
>> Do I have this right?
>>
>> If this is the case, it doesn't sound like the proportioning component
> is a bad thing.
>>
>> Or am I wrong? Do I need to disassemble and modify mine?
>>
>> After replacing every component in my brake system, changing to 80mm
> front calipers and 1-1/16" mid axle wheel cylinders, and bleeding with a
> Hupy
>> style pressure bleeder, I am still not impressed with braking performance
>>
>> Thank you.
>
> The way I see it, the GM Engineers decided that they wanted full pressure
> to the rear brakes for some reason; perhaps because unlike passenger cars
> and pickup trucks, there is close to half of the weight of the vehicle
> over the rear wheels. It makes sense to me to have a combination valve that
> does not have a proportioning section that limits pressure to the rear
> brakes.
>
> --
> 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.
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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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