normal_post in Leaking Proportioning valve in Wheels, Tires, Brakes, Suspension & Steering Author Topic: Leaking Proportioning valve  (Read 217 times)

Offline anlauto

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Leaking Proportioning valve
« on: September 18, 2020, 01:14:19 PM »
My customer supplied a reproduction distribution block for his 1971 Cuda and it's leaking from the bottom of the front brake block...

Found this picture on the interweb to show you what I'm talking about.

What's inside if I remove the nut on the bottom ?

How's it supposed to seal, O-ring ?

Linkback: https://forum.e-bodies.org/wheels-tires-brakes-suspension-and-steering/12/leaking-proportioning-valve/18258/
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Offline ZippyZoo

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Re: Leaking Proportioning valve
« Reply #1 on: September 18, 2020, 01:48:14 PM »
That's the metering valve (hold-off valve) which services the front disc brakes only.
Here are some good articles of what it does and what's inside of it.  You can also get parts to rebuild it there.

https://www.musclecarresearch.com/1970-71-mopar-metering-valve-autopsy

https://www.musclecarresearch.com/content/1970-71-mopar-metering-valve-rebuild

Pressure for the front disc brakes comes from the distribution valve into the angled port on the metering valve.  Then goes to each front caliper from the remaining ports.  I think the FSM illustrates it.  I will attach a picture from the FSM shortly.

Offline anlauto

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Re: Leaking Proportioning valve
« Reply #2 on: September 18, 2020, 01:57:21 PM »
Exactly what I needed, thank you  :worship:

oh...and welcome to the best E Body web site it the world :grouphug:

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Re: Leaking Proportioning valve
« Reply #2 on: September 18, 2020, 01:57:21 PM »

Offline ZippyZoo

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Re: Leaking Proportioning valve
« Reply #3 on: September 18, 2020, 01:59:55 PM »
Attached is how it is hooked up from the Factory Service Manual (1971 Challenger) - 'Cuda should be the same.

Offline Cuda Cody

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Re: Leaking Proportioning valve
« Reply #4 on: September 18, 2020, 02:22:25 PM »
Also, when you put those brake lines in make sure to have a little grease so they don't gall on you.  Galling will almost always leak.

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Re: Leaking Proportioning valve
« Reply #4 on: September 18, 2020, 02:22:25 PM »

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