• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

master cylinder swap questions

  • Thread starter Thread starter notny41
  • Start date Start date Jun 27, 2005

notny41

Member
Aug 15, 2004
204
0
16
Minnesota
Jun 27, 2005
#1
  • Jun 27, 2005
  • #1
I have a 65 with drums in all four corners and a single reservor master cylinder.

I bought a dual res drum/drum mc off a 67 from a friend (thanks Carlos!).

1. Do I need to change the pushrod? I've seen posts that indicate the length is not the same between these years.

2. I think I need to cap off one of the outlets on the distribution block. What size fitting do I need for this and where is it readily available?

3. Do I need any extra tubing for this conversion?

Thanks guys!

P
 

dennis112

15 Year Member
May 15, 2005
1,561
36
79
Amish Wonderland of Central PA.
Jun 28, 2005
#2
  • Jun 28, 2005
  • #2
notny41 said:
I have a 65 with drums in all four corners and a single reservor master cylinder.

I bought a dual res drum/drum mc off a 67 from a friend (thanks Carlos!).

1. Do I need to change the pushrod? I've seen posts that indicate the length is not the same between these years.

2. I think I need to cap off one of the outlets on the distribution block. What size fitting do I need for this and where is it readily available?

3. Do I need any extra tubing for this conversion?

Thanks guys!

P
Click to expand...


The early pushrod normally works best. Yes you will need to cap one of the outlets--sorry I don't know the size but it is common. Yes you will need extra tubing since you probably have only 1 line coming from your master cylinder right now.

Something else that you will need is a line adapter for the MC to normal tubing. This item is a little harder to find.

My suggestion is to poke around on the CJ Pony Parts web site a little. They sell a complete kit that includes all the parts mentioned-lines/adapter/plug (but not the pushrod, which you already have.) If you can't find it there, PM me and I can give you their part #.
 

notny41

Member
Aug 15, 2004
204
0
16
Minnesota
Jun 29, 2005
#3
  • Jun 29, 2005
  • #3
K, I got the dual res master cylinder on.

Plugged the hole where the rears plug into the dist block.

Bent the front line so it is pointing right at the outlet on the mc closest to the rear of the car.

Still wondering if anyone can tell me what size hole and threads that hole is? I need to get an adapter so the line can br run from that hole. It is larger than the 3/8" that all of my fittings are.

I'm pretty sure the hole on the front of the MC is a 9/16" so I'll need to get that adapter too.

But if someone can answer the question about what size the rear hole is, I think I'll be in business. MC is a dual res drum/drum off a 67 stang.

Thanks - P
 

notny41

Member
Aug 15, 2004
204
0
16
Minnesota
Jun 29, 2005
#4
  • Jun 29, 2005
  • #4
I feel much safer already!!! (and I still have to bleed the brakes)

Got the 67 manual drum/drum master cylinder put on and plumbed tonight.

In case someone in the future is looking for the specs on the adapters off the mc - here's what I found:

Front hole for rear brakes is a 9/16 - I had to get a 9/16 male - 1/4 female adapter and plug a 1/4 male - 3/16 female adapter into that. Then the 3/16 rear brake line goes in there (actually a 3/16 female - 3/16 female union fitting and a 12" extension line is in there too).

Rear hole for the front brakes is a 5/16 male - 1/4 female adapter with a 1/4 male - 3/16 female adapter threaded into that. Then the line that comes off the dist block that went to the old mc plugs in there.

Also bought a 3/16 plug to go into the dist block where the rear brake line came out of.

P
 

dennis112

15 Year Member
May 15, 2005
1,561
36
79
Amish Wonderland of Central PA.
Jun 30, 2005
#5
  • Jun 30, 2005
  • #5
Good job in figuring it all out.

I am sure the info will help others in the future.

Good Luck with your projects.
 

notny41

Member
Aug 15, 2004
204
0
16
Minnesota
Jun 30, 2005
#6
  • Jun 30, 2005
  • #6
Thanks - brakes are all bled - time to take her out for a test spin.
 
You must log in or register to reply here.

Similar threads

B
68 manual disc/drum master cylinder
  • Butchd88
  • May 27, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
0
Views
61
1965 - 1973 Classic Mustangs -General/Talk- May 27, 2026
Butchd88
B
D
Brakes 1966 Mustang convertible 289, Auto - Disc brake conversion issues
  • DRGunn427
  • Feb 26, 2025
  • Classic Mustang Specific Tech
Replies
2
Views
623
Classic Mustang Specific Tech Jun 30, 2026
manicmechanic007
C
Master cylinder selection
  • Ch3No2
  • Aug 7, 2023
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
2
Views
971
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 8, 2023
Mustang5L5
E
Finished my Fox Hydroboost Install - Tips
  • Engineer Duane
  • Apr 9, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
4
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 5, 2025
Engineer Duane
E
6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
838
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?