master Cyl questions

[FISHYPETE]

Replacing the master cyl with a new replacement cyl. 66 Barracuda disc stock setup. It has the extra reservoir on top but replacement doesn’t. The original cap has a small pin hole near the top by the nut. Wouldn’t that let moisture in? Also what color would an original unit be? Not a points car but like to look original Thanks

 

[Capt46]

Pete,
I had rebuilt mine keeping the original case upper and lower also there is a disc on the inside. With a standard rebuild kit.

 

[Capt46]

For a regular master cylinder.
1960 1962 1964 1965 1966 Plymouth Dodge master cylinder rebuild kit K-39142 NOS! | eBay 1960 1962 1964 1965 1966 Plymouth Dodge master cylinder rebuild kit K-39142 NOS! | eBay


Sent from my iPad

 

[Capt46]

Don’t part with that master cylinder it comes apart in two pieces upper and lower. You’ll never find it again.
It’s also the tell tale of factory disc brakes.

 

[pishta]

IIRC the stock cap has a rubber diaphragm inside that actually seals the reservoir from outside air. the pinhole may allow for some expansion/contraction of the diaphragm. Also the extended reservoir should come out of the old one and fit into the new one but you'll need the original cap bolt.

 

[jazak5]

just for knowledge got any pics?

 

[Mattax]

just for knowledge got any pics?

Top right here:
Disc Brakes p.6 ( Master Technician's Service Conference 66-7)
Bottom of the page is link to larger version.

 

[ir3333]

i know originality is key to our restorations but most would replace that master with a dual outlet piece and set the original aside to keep with the car.
Something to think about.

 

[FISHYPETE]

Thanks for the replies

 

[66fyssh]

I agree with @ir3333 . My 66 is factory Kelsey Hayes, and I replaced it with a dual reservoir unit. Much safer for when the family is with me. Most people have no idea it's not stock, lol.

 

[BillGrissom]

It is cool for car shows. If safety matters more, change to a dual MC. Many posts on re-plumbing for it.