Is there a master cylinder for manual disc brakes in size 15/16 " bore size that looks kinda stock for a late 60s or early 70s B body . with Manual disc brakes ?
OR is there even an option besides the plastic bodied version like late models
Smallest I can find is 1-1/16"

Go to the parts store and look up a 1975 Duster w/power disc brakes. It will have a 15/16" bore. Factory look.

Thanks.

Got one coming. Should be in my hand the end of today

Should look like the one in my 1973 Dart Sport. Had one that came on the car rebuilt since we knew it worked.

What I found interesting.
Is they list power brakes master as 15/16 bore.
manual brakes ( same application ) has 1-1/16 bore

That seems to be bass ackwards but it is the same on the FSM

Dorman M80266 is a good number

Thanks all,
Picked it up today, should have it bled and on the car next day or 2


https://www.oreillyauto.com/detail/...duster?q=brake+master+cylinder&pos=0

I believe some of the PB cars had an additional bell crank linkage that may have changed the pedal ratio not sure which direction though

B and E did. A body had that bracket assembly, so I assume that was similar. B body power disc were 1 1/8" at least through 70

The 69 B bodies I owned, and my fathers 72 duster, with power discs all had this , B body under the dash , A body under the hood . I believe it was because they had to raise the assembly up so the booster would clear the engine/exhaust manifold ...

On a side note.

My brothers 70 duster and also found some 1969 B bodies.
Manual discs were optional / available.
But yet. ......
And best i can tell.
They all had a bore size 1-1/16 or maybe 1-1/8 .

1 1/8" My understanding at least thru 70 that disc brakes mandated power disc. No manual disc early on. What happen in the 70s, I don't know. Maybe it became an option then.

Maybe when the A body got the large bolt pattern wheels (73 up??), they gave them manual disc brakes ? I remember mom & dads 76 Valiant, bought new, had manual disc brakes.

My brother bought a 1970 Duster 340 off the original owner back in early 80s - manual disc brakes
and Since then Ive seen a few others equipped same way .


I remember reading manual disc brakes were optional on Taxis and maybe Police cars back in 68 or 69 maybe ?????

Correct. A bodies could be had from 67-70 with manual disc brakes.
Same master cylinder for that application regardless of if it was manual or power.
And there was a manual disc brake master cylinder for 70 B body taxi. It was the same 1-1/8 bore master cylinder used on C body with disc that year with an added push rod.

I think I have one of these NOS I bought about 8 years ago ...

Fixed it.
Bench bled and on the car.
A quick bleed all around. Then took it for a spin.

I feel much better now if my daughter drives it.

Car stops really well.