The stock master cylinder is NOT disc brake compatible. Disc brakes take about twice the pressure to operate.

The disc conversion needs a new master and power unit is optional but a good idea.

When you order the master cylinder they will ask if your disc front and rear or dics front and drum rear and the master cyclinder will be set up for those brakes.

There a ton of info on choosing a master cylinder............

http://www.classicperform.com/tech_articles/PDF/Dems_DA_Brakes_3.pdf

http://www.classicperform.com/quickstop.htm

[img]http://www.classicperform.com/Store/1947_59_Trucks/Images/4954CBK-6HK.jpg[/img]

Last edited by showkey; 02/07/2018 8:52 PM.