Master cylinder

[Skully]

What is a good replacement for a Fox Body Master Cylinder, the master cylinder is leaking fluid out, close to the rear .I have to replace the fluid about every week or so. I wiped it off and it is wet at the base of the MC, any ideas.

[Clois Harlan]

Get a late model Mustang 1986-2004 (non abs) master cylinder from NAPA. Of course you can go with a Wilwood set up but that is going to cost you more and require some re-configuring of your pedal assembly.

Clois

[mikiec]

Remember after you install a new one or re-build your old, you will need to flush the entire system before adding new fluid.
Mike

[MaSnaka]

Scully,
After just having done this recently a couple comments...Take your old mc to napa and they will cross reference the part number, mine was on the bottom of mc, and find the correct replacement. It cost me about $75.00 for the late 70's mustang unit 15/16'' bore setup for disc/drum.

Bench bleed the new one per instructions, remember any air in the system has to get removed. The less air you start with the better.

As far as a leak goes I found one of the lines on mine had a deformed flare and nut that was probably from being way overtightened. Napa also has pre-flared lines in different lengths if you find you need one.

And get a quart sized bottle of fluid and flush all the lines starting at the passenger rear,driver rear, passenger front and driver front. Use clear tubing on the bleed nipples at the brakes and run it into a plastic water bottle, you can see the color of the fluid change when you get the new clean fluid to the brakes. Make sure you don't run the mc dry in the process or you will get air and have to start over.

There was quite a bit of brake discussion on the Classic Roadsters forum under "Brake questions". You might find it helpful.

John

[Karl Bebout]

Skully, John's tips are good. Just remember to be sure the end of your bleeder hose, in the jar or bottle, must be kept under the surface of fluid in the jar to prevent sucking air back up into the wheel cylinder. So, you waste a few ounces or fluid, its much better than having to re-bleed because of air in the closed system.

[Mulv]

It is a good idea to use the same type master for sure.
If you use this stuff:

http://www.pegasusautoracing.com/pro...p?Product=****

replacing the brake fluid is a snap-a-roo because the change of colour is easy to see. You will also get better pressure on the pedal when you fix the leak. How is the paint on your car? Fluid will eat it... If you want to make sure everything is tip top, you may want to cut the ends off the brake lines and put new fittings on. If you don't have a flare tool, I and many others do as well as a proper tube cutter. If you need to use it , pas de problem.

Steve