Metering Valve Question

[EB3-GranCoupe]

Is there some one here who can help me with understanding how a Metering Valve works?

http://www.yearone.com/yodnn/TechFAQ/WheelsTiresBrakesFAQ/MoparBrakeLinesValves/tabid/422/Default.aspx

Mine is leaking (brand new from InlineTube) down at the valve stem.  I don't know if it is defective, or if something needs to be undone and re-tightened.

Thanks for any responses!

[Strawdawg]

from the number of posts on this subject and the inline replacements, I guess yours is par for the course.  I think some have had luck taking them apart and replacing the cracked o-rings in them.   At least luck in stopping the leaks

[EB3-GranCoupe]

i did search the posts, but didn't find much specific to metering (or hold-off) valves.  i did run across a link that led to another link and found this:
http://www.imperialclub.com/Repair/Lit/Master/257/page08.htm

I will be calling Inlinetube today, and see what they say. 

[spamtank]

from the number of posts on this subject and the inline replacements, I guess yours is par for the course.  I think some have had luck taking them apart and replacing the cracked o-rings in them.   At least luck in stopping the leaks

I purchased the proportioning valve along with the hold off valve from In-Line.  I ended up only installing the hold off valve.  Knock on wood, mine is not leaking.  I suppose I lucked out. 

I hope you are able to get things worked out there.  Nothing worse than leaking brake fluid all over everything. 

[EB3-GranCoupe]

Nothing worse than leaking brake fluid all over everything

I used DOT-5 brake fluid, or else i would have no paint whatsoever!  I called inlinetube, and reported the defective valve.  even though i have only 38 miles on it since installation (kinda hard to drive when the front brakes aren't grabbing), they only warrant it 6 months from the time of purchase, which was june of last year.  so they gave me a discount on a new one.  chalk it up to the cost of having a hobby!

The Imperial Club website has some really good technical articles.  i had no clue what a 'metering valve' did, or how it works.  now it makes sense!

[spamtank]

I called inlinetube, and reported the defective valve.  even though i have only 38 miles on it since installation (kinda hard to drive when the front brakes aren't grabbing), they only warrant it 6 months from the time of purchase, which was june of last year.  so they gave me a discount on a new one.  chalk it up to the cost of having a hobby!

I installed the Inline proportioning valve, but had trouble bleeding the rear brakes.  After cleaning up the original, and reinstalling, they bled fine.  I tried to return it, but they declined my request.  As you said, "cost of having a hobby."  I couldn't find the "center the valve" procedure.  That probably would have worked.

The Imperial Club website has some really good technical articles.  i had no clue what a 'metering valve' did, or how it works.  now it makes sense!

That is a great site.     Thanks for that!

[EB3-GranCoupe]

My replacement metering valve arrived today.  i know where i will be saturday morning!!!

[spamtank]

My replacement metering valve arrived today.  i know where i will be saturday morning!!!

Are you going to take the leaking one apart to trouble shoot it?  I'd be curious to know if it was a cut o-ring like I've read about on another page.  Good luck!

[EB3-GranCoupe]

yes, you read my mind.  if i can remember to grab the camera, i'll try to take some pics too.

[EB3-GranCoupe]

Got started at 8am, and removed the leaky valve, and installed the new one.  made sure i had no line leaks, and bled the front brakes.  It seemed like i still had some air, so bled them again, and got some air bubbles to release.  unfortunately, i forgot to check the resevoir, and ran the master cylinder dry 

filled it up, ran thru the whole bleed thing, again.  and the new valve started leaking.   

gave it up as a bad job, parked the car, and mowed the grass,  i needed to get something accomplished correctly!

so after mowing, and a few honey-do's; i took the first one apart:

Intake port on the top, left front brake exits on the left & right brake on the right:


from the other side (thats the intake port on the left):


rubber dust seal:


without the dust seal:


unscrewed the hold in assembly:


the diaphragm assembly:










Looking down into the valve:
 

the rubber valve seat:


Everything seemed to appear ok.  no torn pieces, nothing out of the ordinary.  Being a brand new machined part, i wonder if maybe it got stuck in the open position??

[spamtank]

so after mowing, and a few honey-do's; i took the first one apart:

Everything seemed to appear ok.  no torn pieces, nothing out of the ordinary.  Being a brand new machined part, i wonder if maybe it got stuck in the open position??

I looked at the photos, and added a few comments.  You did get really good pictures of all the parts.  Even so, it's sometimes hard to see what's going on.

[EB3-GranCoupe]

Spam,
Thanks for the feedback!  As to your observations:

Bore condition - I didn't run my finger in it, but it appeared that the dark colorign is due to the rubber seal at the bottom of the spring.
Ragged edge of seal - Hmm, i'll take it apart again, and look at it closer.  i didn't notice that.
Knurled edge - yes, i noticed that too, as soon as i unscrewed it.  it did take some effort to get it loose.

It may be a while before i can get it apart again.  the next several weekends are already planned out.  thanks again!