Danger: Single master cylinder on board!!!

Vinyl66

Member

Mar 21, 2004

398

0

16

Oct 18, 2004

#1

• Oct 18, 2004

• #1

Friday I was cruising down the interstate and as I got onto the exit ramp I proceeded to push my brake pedal slowly to the floor and was still going!
So I started pumping them and the brakes caught a little each time to slow me down some and then I downshifted (automatic) to slow even more. Luckily there was no one in front of me and I was able to keep going. I could have easliy hurt Vinyl66 or myself.
I was able to pull into a parking lot (very slowly) and check the problem. The rear brake line was broken inside the fitting that screws into the brake cylinder. Holy crap it was scary driving with no brakes!! No wonder dual master cylinders were federally mandated in 1967. That is just plain dangerous with a single cylinder.

So anyway, I want a dual master cylinder now. Is it didfficult to retrofit a '67 dual master cylinder to my '66. Who has done this swap? What parts do I need? I will probably go to disc brakes in front at a later time also if that changes anything.

 

B

Banditlead

Founding Member

Sep 26, 2002

79

0

0

CT

Oct 18, 2004

#2

• Oct 18, 2004

• #2

http://kastang.net/dualmc.html
Pretty much a simple straightforward bolt it in, run new lines, and your good to go.

 

jb1dsl

Member

May 24, 2004

566

0

17

Marianna, Fl.

Oct 18, 2004

#3

• Oct 18, 2004

• #3

I've got a 66 also and the same happened to me. I blew through a red light between two cars and ******ed it into a church parking lot and finally got it stopped.

 

S

Snail50

Founding Member

Mar 24, 2001

787

0

0

Miami

Oct 18, 2004

#4

• Oct 18, 2004

• #4

I don't know if the regular 67 MC will support disc brakes, unless it is already set up for front discs.

When I converted to 4 wheel discs from 4 wheel drums, I had to replace the MC with one which came standard on 96-98 Cobras (I think). Before I swapped the MC, I drove for awhile with my stock MC, and when I installed the new MC, the improved braking effectiveness was noticeable.

 

mdjay

Premium Sponsor

Dec 9, 2003

896

0

16

Las Vegas, NV

Oct 18, 2004

#5

• Oct 18, 2004

• #5

Nice write up...

You can run the dual master for disc brakes as well. This works with the drums you have but makes converting to disc in front easier, later. The front calipers will need more fluid. I don't think that dual bowl drum master is sufficient for discs if you are eventually going that way...

 

jb1dsl

Member

May 24, 2004

566

0

17

Marianna, Fl.

Oct 18, 2004

#6

• Oct 18, 2004

• #6

whats up with the ******

 

Vinyl66

Member

Mar 21, 2004

398

0

16

Oct 18, 2004

#7

• Oct 18, 2004

• #7

That is a great write up and exactly what I need. Pics are always good
I will be doing this swap very soon and I would suggest others with the single cylinder fruit jar do the same. I was actually lucky.

 

DukeGnarley

Member

Apr 2, 2003

597

2

19

Auburn/Ellensburg, Wa

Oct 19, 2004

#8

• Oct 19, 2004

• #8

my brakes went out in my '66 as well, that really sucked, but thankfully i figured it out before the huge hill i was about to go down. the swap is simple, and if anyone hasn't done it yet, they should. doesn't cost too much and the piece of mind is worth it.

 

B

Banditlead

Founding Member

Sep 26, 2002

79

0

0

CT

Oct 19, 2004

#9

• Oct 19, 2004

• #9

Just in case its in question, I didn't write it up, I just bookmark every write up I ever find just in case I need it. But yea, it is a good write up.

 

Hack

15 Year Member

Mar 23, 2004

1,945

13

69

Minneapolis

Oct 19, 2004

#10

• Oct 19, 2004

• #10

http://www.mustangsteve.com/granadadiscs.html

There's another good web site for Mustang brake info. I did the Granada disc upgrade and it made a huge improvement in the car's stopping ability.

Bending your own brake lines isn't bad to do. Probably the toughest part of the job is getting everything apart. Soak the fittings in PB blaster for a few days, and get brake line wrenches.