A bigger booster won’t give you more brake pressure, it just makes it easier on your leg.
Did you do a brake line pressure test on the existing master cylinder?
If it’s too low you may have the wrong diameter Mayer cylinder.
Usually the too big diameter ones can’t generate enough psi.
Even though I have 4 wheel disks I use a stock 68 front disk rear drum MC that gets me about 1150 PSI at all four corners.

Last edited by Rudi (8/18/2023 8:20 AM)

Rudi wrote:

A bigger booster won’t give you more brake pressure, it just makes it easier on your leg.
Did you do a brake line pressure test on the existing master cylinder?
If it’s too low you may have the wrong diameter Mayer cylinder.
Usually the too big diameter ones can’t generate enough psi.
Even though I have 4 wheel disks I use a stock 68 front disk rear drum MC that gets me about 1150 PSI at all four corners.

Thanks... For some reason I was thinking that a bigger booster would apply more pressure.
I never tested brake line pressure, but did test the brakes at varying speeds after I installed the kit a few years ago.

Last edited by Toploader (8/18/2023 7:34 PM)

MS wrote:

I have installed a few sets of SSBC brakes years ago.  They suffer from using the worst possible friction psd materials.
Install OReilly Brakebest el cheapo pads and they will improve. 
Typically a 15/16” master cylinder is used with them.  I would suggest converting to MustangSteve booster system but, since your car is a four speed, it will not work. 

I would recommend remove the tiny booster and install a 74 Maverick 15/16” master cylinder for best results. Also swap the pads.
If your calipers are old, be sure they are not seized.  The four piston calipers were known to seize up one piston at a time until you only have one piston working.

Thanks MS!
Just to clarify... What booster are you suggesting to use with the Maverick master cylinder? Where would you purchase the suggested master cylinder from? Is there a model number?

MS wrote:

I have installed a few sets of SSBC brakes years ago. They suffer from using the worst possible friction psd materials.
Install OReilly Brakebest el cheapo pads and they will improve.
Typically a 15/16” master cylinder is used with them. I would suggest converting to MustangSteve booster system but, since your car is a four speed, it will not work.

I would recommend remove the tiny booster and install a 74 Maverick 15/16” master cylinder for best results. Also swap the pads.
If your calipers are old, be sure they are not seized. The four piston calipers were known to seize up one piston at a time until you only have one piston working.

SSBC calipers have stainless steel liners to remove the seizing tendency. Swapped mine way back then when SSBc was a going concern.  The 74 Maveric MC works well, even with manual brakes.  On mine, they lasted a couple of decades and several pad changes.

 

lowercasesteve wrote:

MS wrote:

I have installed a few sets of SSBC brakes years ago. They suffer from using the worst possible friction psd materials.
Install OReilly Brakebest el cheapo pads and they will improve.
Typically a 15/16” master cylinder is used with them. I would suggest converting to MustangSteve booster system but, since your car is a four speed, it will not work.

I would recommend remove the tiny booster and install a 74 Maverick 15/16” master cylinder for best results. Also swap the pads.
If your calipers are old, be sure they are not seized. The four piston calipers were known to seize up one piston at a time until you only have one piston working.

SSBC calipers have stainless steel liners to remove the seizing tendency. Swapped mine way back then when SSBc was a going concern.  The 74 Maveric MC works well, even with manual brakes.  On mine, they lasted a couple of decades and several pad changes.

 

That's reassuring! Do you run the SSBC booster with the Maverick master cylinder?

Toploader wrote:

lowercasesteve wrote:

MS wrote:

I have installed a few sets of SSBC brakes years ago. They suffer from using the worst possible friction psd materials.
Install OReilly Brakebest el cheapo pads and they will improve.
Typically a 15/16” master cylinder is used with them. I would suggest converting to MustangSteve booster system but, since your car is a four speed, it will not work.

I would recommend remove the tiny booster and install a 74 Maverick 15/16” master cylinder for best results. Also swap the pads.
If your calipers are old, be sure they are not seized. The four piston calipers were known to seize up one piston at a time until you only have one piston working.

SSBC calipers have stainless steel liners to remove the seizing tendency. Swapped mine way back then when SSBc was a going concern.  The 74 Maveric MC works well, even with manual brakes.  On mine, they lasted a couple of decades and several pad changes.

 

That's reassuring! Do you run the SSBC booster with the Maverick master cylinder?

I have evolved past the KH stockers.  Now I have Wilwoods, but the brakes remain manual with the 74 Maverick mc.
 

Last edited by lowercasesteve (8/19/2023 12:50 PM)

MS wrote:

lowercasesteve wrote:

Toploader wrote:

That's reassuring! Do you run the SSBC booster with the Maverick master cylinder?

I have evolved past the KH stockers.  Now I have Wilwoods, but the brakes remain manual with the 74 Maverick mc.
 

A local friend works for Wilwood and hosts brake seminars. I asked him what was different on the Wilwoods that made them an improvement over the K/H calipers. He said they are dimensionally the same. They just look different.
My choice is a larger caliper and rotor that gives more control.
 

My K-H's were 11" and the Wilwoods are 12.19".  I'm not sure they work any better.  Unless you do a lot of canyon carving, I would recommend keeping the K-H's.
 

That looks like the one.  74 Maverick disk-drum w/manual brakes.  That's what I use.  I do not know about using it with power brakes.

Heere is the SSBC web site

SSBC-USA | American Stopping Power

If you are gullible enough to install an SSBC booster, you should ask them.

Yes, it was.  I forgot I wasn’t on facebook.

The 15/16” master cylinder for Maverick or Granada bolts up and has same physical dimensions as the 1” bore 67-73 Mustang master cylinder.  The line fittings are different sizes.  Both have 1” engagement depth.
The Mav unit has a c-clip inside to retain the pushrod, which is not a factor when using a booster.

But, seriously, the SSBC booster is not something I would've ever put on a Mustang.

I’m not sure this helps, but here is my brake setup. 
I have four-wheel disc brakes on my 65 Mustang.  Original I had non-power brakes and used the following master cylinder.  Increased brake pedal force was needed, but not what I would consider excessive.
Raybestos: MC390217
Master Cylinder: 94/95 Cobra SVT, 15/16" bore, outlet ports toward the engine
 
I installed a hyroboost power brake system a few years ago and switched to this master cylinder.  Brake pedal force is like that of a modern vehicle. 
Raybestos: MC390269
95-97 Explorer MC, 1-1/16" Bore, outlet ports toward the fender.