Master cylinder for c8a

[Lynn Eades]

The result will be long pedal travel (maybe too much, even when well adjusted) but good pressure.

[Lynn Eades]

There are options in the wheel cylinders as well. I don't know what bore size is fitted to the truck, but aside from the 1 1/2" bore, there were also 1 3/8" bore wheel cylinders. I imagine the small bore master cylinder matches up with the small bore wheel cylinders in the small truck. I know the large trucks also had vacuum boosters which is another consideration.

[Lynn Eades]

Hanno, I believe you have the pressure thing the wrong way around.
Harry, may I suggest that if the master cyl. was bled carefully the cup should never travel that far down the bore. Not to offend, just that the m/cyl should be bled first off the vehicle, and then with short pedal strokes until the air is gone.
I believe this is a std practice these days, otherwise all the internals get hammered.
The seal that goes at the end of the bore, should be pushed down the hole straight until the end and then tipped over past the hole.

[Hanno Spoelstra]

Originally Posted by Lynn Eades

Hanno, I believe you have the pressure thing the wrong way around.

Of course Lynn, now corrected.

At least we established it is best to use the original size master and slave cylinders

[Grant Bowker]

Serge is working on a C8A HUP, so the standard heavier CMP approach of "all wheel cylinders are Ford parts" doesn't apply, the rear brake set-up on the C8A is Chevrolet including the wheel cylinders. I'm quite sure Rob Clarke found suitable rear wheel cylinders "off the shelf" at one of the Chevrolet restoration parts sellers.

[serge]

Hello every one

First I thank you for all answers you wrote to help me for the resolution of the problem. The lack of these part was the reason why I had stop the work of restoration. With the new master cylindrer that I believed to be a good part I have restarted the job and even put off the cab from the frame.

Due to the small thickness of the pressure pipe, overboring the master cylinder would modify the small passage vertically into the fluid reservoir leading to a malfubction of the brake.

What ever the solution I have to change the bracket and build an other vertically bracket.
With these new bracket I could use a DODGE WC master cylinder (1' ¼) or the WAGNER MC9220 but these last seems to be no more available but I found Dorman M9220,

https://www.dormanproducts.com/p-29853-m9220.aspx

I have asked for availability