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5/09/2021 2:29 PM  #1


One of my favorite (and yours) subjects.....brakes!!!....

66 Mustang coupe. front discs and drum rears
I KNOW the front discs do 75/80% of the stopping
I KNOW the rear brakes determine how much "pedal" we have
My car stops fine (wayyyy better than the old drum set-up!) I just want to have more pedal.

I was thinking......!!! ... what if...I used front brake wheel cylinders (since they are smaller ...I think instead of the rear wheel cylinders.?
Can anybody tell me the inside dimensions of the front slave/wheel cylinder...
and the inside dimensions of the rear slave/wheel cylinder?

IF...they are inter-changeable..wouldn't the "smaller" cylinder require LESS fluid to operate, therefore giving more pedal!?
Thanx
6sal6


Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
 

5/09/2021 2:47 PM  #2


Re: One of my favorite (and yours) subjects.....brakes!!!....

Sal,
Take a "break" and leave your setup alone...

 

5/09/2021 2:52 PM  #3


Re: One of my favorite (and yours) subjects.....brakes!!!....

That's how we would balance front to rear braking back in the old days. You can buy most any size WC that would fit. I just don't remember off hand if FT and R are interchangeable.

I'm not allowed to go in the garage today to check & see.

 

5/09/2021 4:06 PM  #4


Re: One of my favorite (and yours) subjects.....brakes!!!....

I think you will find fronts are larger diameter.

Go to OReilly or RockAuto website and look up wheel cylinders for various years and engines in Mustangs. 

The INFO tab will tell you the diameter of the wheel cylinder piston.

I would advise you not mess with the original stuff.  If you want less pedal travel, add power brakes with a revised pedal ratio.

Changing piston size does not just change pedal travel.  A larger wheel cylinder will increase the likelihood of wheel lockup.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

5/09/2021 5:39 PM  #5


Re: One of my favorite (and yours) subjects.....brakes!!!....

josh-kebob wrote:

Sal,
Take a "break" and leave your setup alone...


Gary Zilik - Pine Junction, Colorado - 67 Coupe, 289-4V, T5
 

5/09/2021 5:51 PM  #6


Re: One of my favorite (and yours) subjects.....brakes!!!....

If you don’t want rear disks and want to keep drums do what Shelby did and go with a wider rear shoe set up.
I had them for a while till the Mk Vll disk conversion intrigued me.
4 wheel disks are working really well for me.


Good work ain't cheap, Cheap work ain't good!   Simple Man
 

5/09/2021 5:55 PM  #7


Re: One of my favorite (and yours) subjects.....brakes!!!....

Rudi wrote:

If you don’t want rear disks and want to keep drums do what Shelby did and go with a wider rear shoe set up.

Reckon that would give more pedal?
Galaxy shoes I bet.
6s6
 


Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     Thread Starter
 

5/09/2021 6:32 PM  #8


Re: One of my favorite (and yours) subjects.....brakes!!!....

What do you mean by "more pedal"?
Do you want the pedal to move farther before the brakes lock up?
Is the pedal "mushy" now and you want a firmer pedal?
I don't know what you're asking.
 

 

5/09/2021 8:44 PM  #9


Re: One of my favorite (and yours) subjects.....brakes!!!....

Texas! wrote:

What do you mean by "more pedal"?
Do you want the pedal to move farther before the brakes lock up?
Is the pedal "mushy" now and you want a firmer pedal?
I don't know what you're asking.
 

Wellp..............the pedal is firm (not mushy).....stops the car pretty darn good....the pedal just seems to go down a lot before the car starts stopping.
NEVER goes to the floor.....just wish it would start stopping the car before the pedal goes so low. (make sense?)
6sally6
 


Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     Thread Starter
 

5/09/2021 8:50 PM  #10


Re: One of my favorite (and yours) subjects.....brakes!!!....

I certainly understand what you are sayin', Mike.  Since I went to the 08ish GT front brakes I have a low pedal.  Stops great but more travel before anything happens than I'm used to...or care for.  As a test I disconnected and plugged the line to the rears.  Pedal travel the same.  Then I plugged the fronts.  Pedal came right up to the top.  Sooooo......The issue is with the front calipers.  I don't know how to fix it butt (TS&T) at least I know what it is.
 


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

5/09/2021 10:17 PM  #11


Re: One of my favorite (and yours) subjects.....brakes!!!....

Sal

65 front drums on my car were (4 wheel power drums):

1-1/8” diameter
3/8-24 threads

Part number 33614 (LH) & 33615 (RH)

Your rear brakes will lock up.

65 Mustang rear drums = 29/64” (289 cid)
78 Granada rear drums = 15/16” (30/64”) (302 cid)

Last edited by Nos681 (5/09/2021 10:18 PM)

 

5/10/2021 3:15 AM  #12


Re: One of my favorite (and yours) subjects.....brakes!!!....

I only have discs on the front and it stops WAY better than when it had drums all round. How much of a difference do discs on the rear make?


1964-1/2 D Code Coupe - 289 V8, 4 Speed Toploader, 3.00 ratio rear, Autolite 4100 Carb, 15" tires, Pertronix ignition
 

5/10/2021 6:19 AM  #13


Re: One of my favorite (and yours) subjects.....brakes!!!....

6sally6 wrote:

Texas! wrote:

What do you mean by "more pedal"?
Do you want the pedal to move farther before the brakes lock up?
Is the pedal "mushy" now and you want a firmer pedal?
I don't know what you're asking.
 

the pedal just seems to go down a lot before the car starts stopping.
wish it would start stopping the car before the pedal goes so low. (make sense?)

 

You can try a Master Cylinder with a larger bore diameter. It moves more fluid with the same amount of stroke as a MC with a smaller bore. But it will require more pressure on the pedal from your leg. Many guys use a MC with a 1", 1-1/16" or even 1-1/8" bore. I'm using 1-1/16" with 4 wheel discs.

 

5/10/2021 5:18 PM  #14


Re: One of my favorite (and yours) subjects.....brakes!!!....

I have the same issue with my brakes on the pedal travel, I have 70 front disk and explorer rear disk on an 8.8 rear-end. The car stops great but I did try an 1 1/8th MC and it would not stop the car unless I stomped on the brakes, the pedal travel was only slightly better.


1965 Notchback, 8.8 rear end, T-5, Diy Front Struts, Shelby Drop, Bumpsteer Kit
 

5/11/2021 7:37 AM  #15


Re: One of my favorite (and yours) subjects.....brakes!!!....

6sally6 wrote:

Rudi wrote:

If you don’t want rear disks and want to keep drums do what Shelby did and go with a wider rear shoe set up.

Reckon that would give more pedal?
Galaxy shoes I bet.
6s6
 

Sal, I believe Shelby used Fairlane Station Wagon rear drums, they were 10" diameter and (I think) 2.5" wide.  I do not believe these drums and backing plates are available today.  The Galaxie brakes were 11' diameter and different widths based on the body style, 2-door, 4-door, station wagon, etc.
If you're braking is fine now, I'd leave it alone. 


65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
 

6/09/2021 8:54 PM  #16


Re: One of my favorite (and yours) subjects.....brakes!!!....

I would really like know how to fix this low pedal issue, I have a 1 inch MC and 70 Mustang front calipers with Explorer 8.8 rear disk. The car stops well but there is the long pedal travel that is un-nerving. I have tried an 1 1/16 MC but the pedal effort was too great. Maybe it's time for a front caliper change but which one?


1965 Notchback, 8.8 rear end, T-5, Diy Front Struts, Shelby Drop, Bumpsteer Kit
 

6/13/2021 7:01 PM  #17


Re: One of my favorite (and yours) subjects.....brakes!!!....

Triton wrote:

I would really like know how to fix this low pedal issue, I have a 1 inch MC and 70 Mustang front calipers with Explorer 8.8 rear disk. The car stops well but there is the long pedal travel that is un-nerving. I have tried an 1 1/16 MC but the pedal effort was too great. Maybe it's time for a front caliper change but which one?

Ditch the problematic Exploder rear caliper setup.

Last edited by MS (6/13/2021 7:02 PM)


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/13/2021 9:45 PM  #18


Re: One of my favorite (and yours) subjects.....brakes!!!....

MS wrote:

Triton wrote:

I would really like know how to fix this low pedal issue, I have a 1 inch MC and 70 Mustang front calipers with Explorer 8.8 rear disk. The car stops well but there is the long pedal travel that is un-nerving. I have tried an 1 1/16 MC but the pedal effort was too great. Maybe it's time for a front caliper change but which one?

Ditch the problematic Exploder rear caliper setup.

Actually...I plugged the front and rear lines out of the MC one at a time.  With fronts plugged pedal came right up were it should be.  With the rears (Explorer discs) the pedal went back to the same relatively low point it has been since installing the the 08-14 (I think) GT brakes. 
So, replacing the Explorer rears, in my case, does NOT sound like a viable solution.

Maybe if I put a carburetor on it.........?

 


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

6/19/2021 9:03 AM  #19


Re: One of my favorite (and yours) subjects.....brakes!!!....

Bullet Bob wrote:

MS wrote:

Triton wrote:

I would really like know how to fix this low pedal issue, I have a 1 inch MC and 70 Mustang front calipers with Explorer 8.8 rear disk. The car stops well but there is the long pedal travel that is un-nerving. I have tried an 1 1/16 MC but the pedal effort was too great. Maybe it's time for a front caliper change but which one?

Ditch the problematic Exploder rear caliper setup.

Actually...I plugged the front and rear lines out of the MC one at a time.  With fronts plugged pedal came right up were it should be.  With the rears (Explorer discs) the pedal went back to the same relatively low point it has been since installing the the 08-14 (I think) GT brakes. 
So, replacing the Explorer rears, in my case, does NOT sound like a viable solution.

Maybe if I put a carburetor on it.........?

 

Well, Bullet, while the carb may be a sure fire solution to getting the car to GO, it may not be the cure-all for getting it to stop.
My main objection to the Explorer rear discs is their added complexity of the drum style parking brake.  When I hear from customers with rear disc issues, it is typically when they have Explorer rear discs or those funky Cadillac calipers that are used on the kits like from summit.


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/19/2021 11:29 AM  #20


Re: One of my favorite (and yours) subjects.....brakes!!!....

I understand and I agree with your comments about the Exploder drum type parking brake.  And....if I ever make it run properly again...without installation of a pot...I will likely install the Blue Oval  Mustang type rears that I've had setting in a box for a few years. As for the discs themselves, they seem to work okay now that I scrapped the proportioning valve and added the vacuum pump to get the brake pressure up where it should be.


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

6/19/2021 1:03 PM  #21


Re: One of my favorite (and yours) subjects.....brakes!!!....

How much vacuum does your pump pull?


Money you enjoy wasting is NOT wasted money... unless your wife finds out.
 

6/19/2021 4:08 PM  #22


Re: One of my favorite (and yours) subjects.....brakes!!!....

17.5"


"you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
 

Board footera


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