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Re: Problem with brass body proportioning valve [message #365298 is a reply to message #365293]

Fri, 09 July 2021 09:22

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma:

Senior Member

First, we should call it a combination valve as proper terminology. The currently off shore produced MBM Brake PV2 disc drum combination valve that Cinnabar and others install (with proportioning!) has been found to have a very high multiple mode fail rate. They have visibly smaller fluid ports as well. The NOS GM brass valve number was sourced by Bob Stone and has had zero known defects over more that 10 years. The rear section rubber can easily be removed by end user and the “proportioning” function defeated, while retaining the hold off, safety shuttle valve and light switching (grounding) functions. I would talk to Bob or if you go on line to CPP (classicperform.com) there is a diagram with notes on removing the ‘rubber piston’. There is a “drought” of good options out there as GM Restoration does not license brake related parts, so no incentive to get them made by quality shops as reproductions. Also remember GM phased out steel valves (like our original) due to corrosion. Some 80’s GM cars were still delivered with steel combination valves, but by say 1990 all service parts were brass. Most GM valves are now depleted.

John Lebetski
Woodstock, IL
77 Eleganza II

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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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