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Old 08-26-2009, 01:42 PM   #1 (permalink)
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Default Residual pressure valve removal?

I have a maverick master cylinder on the 'stang. With the rear discs, I don't need a residual pressure valve.
How do I remove the one that is in there (if it is)?
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Old 08-26-2009, 07:06 PM   #2 (permalink)
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Most drum/disc systems have a junction block not in the MC. I'm not familiar with the maverick mc though. All you need to do if it's a junction block is take the nut off the front and take out the plunger and springs and put the nut back on. Now it just becomes a t-fitting.
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Old 08-27-2009, 01:56 AM   #3 (permalink)
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thanks, I was under the impression that some m/c had residual valves built into them
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Old 08-27-2009, 06:23 AM   #4 (permalink)
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Quote:
Originally Posted by Ripped
thanks, I was under the impression that some m/c had residual valves built into them
Yes, they do. Many service replacements, however, don't. The flare seat can be removed from the MC by turning a small screw into the orfice, then pulling the entire fitting out.
Here's the seat and valve removed:

Here's a (poorly focused) picture of the valve in the MC after the seat was removed:

Here's an MC with no valve after removal of the seat:

The first MC was from a '67 Mustang, either original, or at the newest from the mid-seventies.
The second MC was a NAPA service replacement for '75-'79 Granada purchased around2004-2005.
As you can see, although the Granada had rear drums, there was no res pressure valve. I don't know how one might figure out if you have the valve or not without physically pulling the seat out. As with most things Ford, nothing is clear or easy.
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Old 08-27-2009, 01:44 PM   #5 (permalink)
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thanks

that answers the question
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Old 08-27-2009, 03:36 PM   #6 (permalink)
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Good post Dennis. I went through this a few years ago. I ended up with a master cylinder off a 1992 Dodge Caravan. I pulled the brass flares out and there was nothing behind them.
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Old 08-29-2009, 12:57 AM   #7 (permalink)
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Good stuff to know. Thanks for the post Dennis.
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