GMCforum: GMCnet » Combination valve leaking fluid

Home » Public Forums » GMCnet » Combination valve leaking fluid - suspect defective part

Show: Today's Messages :: Polls :: Message Navigator

Combination valve leaking fluid - suspect defective part [message #226929]

Thu, 24 October 2013 20:18

MichaelP

Messages: 65
Registered: October 2012
Location: Ohio

Karma:

Member

[EDITED OVER THE PAST TWO DAYS AS I'VE NARROWED DOWN THE PROBLEM WITH OUR COMBINATION VALVE ]

...Just had our combo valve replaced (two months ago=431 miles) and now there is substantial fluid dripping out of the brake line connection at the bottom of the valve. Pedal went to nothing overnight.

After two days diagnosing, pumping, bleeding, dripping, I've determined the main source of the leak is out of the METERING VALVE. Looking at the cross section provided by "The Pedantic Mechanic" it appears the seal between the metering spring and the valve bolt has failed. I'd assume this thing was originally designed so you could change the pressure, i.e. "meter", the front brake lines, although, for all I know, this could be a working function of the valve -- though I highly doubt it given it's apparently causing air go get into our system.

We're gonna chance it and make the 150 mile drive to Buford tonight after traffic, hoping this is indeed the source of the leak and not the brake line itself, which I originally suspected. (I held my finger directly under the metering valve nut while someone pumped the pedal, and my finger was wet with brake fluid -- the only place it could come at that angle was from the metering valve. I tried tightening it down, and it did tighten a little bit, but fluid still poured out.

I have a few questions:

1. What's the point of this metering valve, anyway, if psi on our coaches is usually desired as high as possible, rather than have the ability to back it off.

Anyhow, I may try to get a better grip on the valve nut and give it one last wrench before leaving, but I'm afraid I'll shear something on this crappy part, so probably just leave it and put our trust in metal tolerances, and hope it doesn't get worse during the 2.5 hour drive.

Wish us luck!

[Updated on: Sun, 27 October 2013 16:31]

Report message to a moderator

[Message index]

		Combination valve leaking fluid - suspect defective part By: MichaelP on Thu, 24 October 2013 20:18
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: werewilfs on Thu, 24 October 2013 20:34
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Fri, 25 October 2013 09:52
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: USAussie on Thu, 24 October 2013 21:15
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: USAussie on Thu, 24 October 2013 22:50
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Fri, 25 October 2013 09:33
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: lqqkatjon on Thu, 24 October 2013 21:20
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: Harry on Thu, 24 October 2013 21:54
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: A Hamilto on Thu, 24 October 2013 22:16
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: Mr ERFisher on Thu, 24 October 2013 22:22
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: Ken Burton on Thu, 24 October 2013 23:23
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Fri, 25 October 2013 09:48
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Fri, 25 October 2013 10:05
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: jhbridges on Fri, 25 October 2013 10:10
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Fri, 25 October 2013 15:49
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: USAussie on Fri, 25 October 2013 19:25
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: James Hupy on Fri, 25 October 2013 19:35
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: USAussie on Fri, 25 October 2013 20:05
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Sat, 26 October 2013 13:02
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: captjack on Sat, 26 October 2013 13:11
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Sat, 26 October 2013 14:17
		Re: Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Sun, 27 October 2013 12:54
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: James Hupy on Sun, 27 October 2013 13:36
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: A Hamilto on Sun, 27 October 2013 15:21
		Re: [GMCnet] Combination valve leaking fluid, no brakes in LaGrange, GA By: MichaelP on Sun, 27 October 2013 17:08
		Re: Combination valve leaking fluid - suspect defective part By: JohnL455 on Sun, 27 October 2013 18:44

Previous Topic:	[GMCnet] Nearly 500 Branson photos posted
Next Topic:	another potential problem! Why my air bellows are low?

Goto Forum:

-=] Back to Top [=-

Current Time: Sun Oct 06 14:27:58 CDT 2024

Total time taken to generate the page: 0.00562 seconds