As I recall, the stock wheel cylinders on my 4 wheel drum brakes were 29/32” with a 289.

Which is .906”

What front brakes do you have?

I remember the 78 Granada had a 1/32” larger bore (15/16”…30/32”)  than my 65.

I had considered changing wheel cylinders when I installed the Granada front discs.
Never did…in the past now.

I know the Granada brakes with semi-metallic brakes for Taxi/Police/severe duty work well.
78 Granada calipers are about 2-9/16”….remanufactured ones might be slightly larger.

Then next questions would be about your master cylinder.  (Diameter, single or dual, manual)

I looked at the Scarebird offerings briefly for first generation Mustang.

I don’t see the kit available for Mustang, only rotors that have been machined and redrilled bolt pattern.
That’s it.

I also looked up some info about ‘92 S10 pickup brake components on Rock Auto.
Gotta realize that the rear end on an S10 is lighter (2wd or 4wd) than a Mustang.

I noticed a couple of things (92 S10):
1).  Brake master cylinder has 2 different piston sizes (24mm and 36mm)
2).  Rear wheel cylinders are smaller than stock 289 Mustang’s .750” - .875” (24/32” - 28/32”)
3).  Front calipers are 63mm-63.5mm (about 2-1/2”)

This mix of Mustang and GM might be the cause of your pedal level.
Steve’s advice is perhaps the best solution without changing brake components.
Ford brakes would be better.😁

What diameter are your wheels?

Last edited by Nos681 (2/07/2023 6:21 AM)

6sally6 wrote:

If I remember my fiziks/physics class...the smaller bore 'should' give me more pedal ! Right?!
BUTT.......the smaller bore wheel cylinders should give me a little more pedal ?!
Anybody???
I just hate to go through the mess if the change would be negligible.
Thankee
6sally6

The smaller bore diameter will require less fluid to activate the brakes, and less pedal travel.  The tradeoff is less pressure exerted to the brakes (due to the smaller bore), and a higher pedal pressure to achieve the same braking force.