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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
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Sal,
Take a "break" and leave your setup alone...
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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.
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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.
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josh-kebob wrote:
Sal,
Take a "break" and leave your setup alone...
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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.
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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
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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.
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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
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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.
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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)
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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?
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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.
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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.
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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.
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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?
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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)
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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.........?
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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.
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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.
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How much vacuum does your pump pull?
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17.5"
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