Proportioning valve leaking
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Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Proportioning valve leaking
It is leaking right where the rear brake line is plumbed into the block and dripping on the frame. The rear reservoir is almost empty.
What am I looking at to fix this ?
What am I looking at to fix this ?
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
Look at the picture below. Is it leaking at the rubber disc shaped seal located on one of the flats of the hex on the big end plug? If so, you are looking at buying a new valve since this part is pressed together and can't be taken apart to replace the 2 o'rings that are leaking (second photo)
Last edited by Duke94; Oct 6, 2007 at 08:59 AM.
Thread Starter
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
THanks for the pics and the info you guys I will get under there this morning and take a look at where it is leaking 
Just looked at that pic again, so if it is leaking from the "long nut portion" I have to buy a whole block ? or as the Haynes calls it Combination Valve ?
Just looked at that pic again, so if it is leaking from the "long nut portion" I have to buy a whole block ? or as the Haynes calls it Combination Valve ?
Last edited by MotorHead; Oct 6, 2007 at 09:58 AM.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
THanks for the pics and the info you guys I will get under there this morning and take a look at where it is leaking
Just looked at that pic again, so if it is leaking from the "long nut portion" I have to buy a whole block ? or as the Haynes calls it Combination Valve ?
Just looked at that pic again, so if it is leaking from the "long nut portion" I have to buy a whole block ? or as the Haynes calls it Combination Valve ?
Thread Starter
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I was just under the car and it looks like the leak is coming from where the line meets the nut, there is no moisture on the block or the long hex portion it appears the line has split or just rusted out in that area.
Is there a way to repair this, can cut the line back to a good portion and splice a short piece in there ? If so what tools do I need I have no flaring tools at this time but not opposed to buying them.
I really don't want to replace the whole line unless it is just a section that can be done fairly easily
Yup just got someone to press on the pedal and a pinhole leak in the line shoots brake fluid right across and onto the exhaust pipes
Is there a way to repair this, can cut the line back to a good portion and splice a short piece in there ? If so what tools do I need I have no flaring tools at this time but not opposed to buying them.
I really don't want to replace the whole line unless it is just a section that can be done fairly easily
Yup just got someone to press on the pedal and a pinhole leak in the line shoots brake fluid right across and onto the exhaust pipes
Last edited by MotorHead; Oct 6, 2007 at 02:53 PM.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
Yes, you can cut out the bad part and just replace that piece. You'll need a union and a couple of tube nuts. Only problem will be the tight quarters to try and flare the tube. Might just as well cut as much off as you can.
