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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  Location of the brake residual valve??

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Author Topic:   Location of the brake residual valve??

Posts: 44
From: Bend, Oregon
Registered: Oct 2005

posted 01-16-2006 10:17 PM     Click Here to See the Profile for silverblueBP        Reply w/Quote

I have the Cobra Auto front discs, MC and stock rear drums. All new lines, dist block and an adj prop valve.
The brakes have been great since I got it back on the road, it just has a little too much travel before engaging. I have an adj. MC rod and it's adjusted to just before the brake light comes on.

From alot of searching and reading I realize I didn't install a res. valve in the rear line.
Question is, where should it go? Does it have to go close to the MC or can I put it at the rear ahead of the flex line going to the axle?
The rear would be an easy install, the front would need a re-do of the line. Doesn't matter to me, I just want to install it where it will work!

Mark Sellers
1966 Mustang 2+2 set up for Open Track and Vintage Racing.
Details here:

69 Sportsroof

Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002

posted 01-16-2006 10:50 PM     Click Here to See the Profile for 69 Sportsroof        Reply w/Quote
I've always thought the residual valve was located in the master cylinder. Sorry. Guess I'm not much help.

Scott H

Posts: 1480
From: Chicago area
Registered: Mar 2005

posted 01-16-2006 11:00 PM     Click Here to See the Profile for Scott H        Reply w/Quote
I think its going to check the pressure no matter which end of the line you put it in.

From the Tech section at :
Residual Valves: Residual valves are pressure valve use to retain pressure in the lines. The most common use is on a hotrod when there is a floor mounted brake pedal and master cylinder. Mounting the master cylinder (M/C) below the floor positions it below the calipers. Gravity will cause the fluid to flow away from the calipers. The residual valve will retain pressure within the lines. (i.e. 2 pounds residual valve will retain 2 pounds of pressure, 10 pound will retain 10 pounds.) Drum brake master cylinders have residual valve(s) built into the master cylinder. This is needed to maintain pressure against the cup seals in the wheel cylinders. If you are using a disc brake master cylinder or after market you will need to install a 10 pound residual valve for the drum brakes. Do not install a residual valve if your master cylinder already has one in it. This will cause the brakes to lock up after the second application to the brake pedal.


Posts: 44
From: Bend, Oregon
Registered: Oct 2005

posted 01-17-2006 10:56 AM     Click Here to See the Profile for silverblueBP        Reply w/Quote
The C-A Master cyl does not have the valve in the body, it needs to be added in line.
The Wilwood valve I have says to install near the MC. Just wondering if it will work at the other end of the line. Seems to me that it would, just looking for the best way to make it work.....and easy if possible!

Thanks for the help.

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