New Dual Master Cylinder?

[racerguy99]

I've read all I can on replacing the stock single master on my Series II, with a dual master, giving me a safer dual circuit system. It appears the Nissan F10 is the common choice, and it appears kinda pricey if/when it is available. I've also read some about using a 71 Dodge Colt master, like this: http://www.napaonline.com/Catalog/C...Master-Cylinder-Remfd/_/R-NMBP2264_0358914730

It looks like this one has two different port sizes (weird to me...). The bore size is listed as .687, which seems good. Anyone use this? Any problems?

 

[260Alpine]

It lists the 10mm size for the brake line fittings and 7mm for the bleeder fittings. If you want remote or reservoirs mounted on master look at Wilwood or Tilton.

 

[Gitnrusty]

dual brake master

NAPA came up as discontinued/obsolete on this Dodge cylinder, I was hoping to get a look at one before committing to one of these.
Rockauto came up with one at about the same price as NAPA showed, but the illustration was a little different, and the one UPS delivered a few days later looks different yet!
But it came in a NAPA box, part #39022
The brake line ports both come off the top of the cylinder, one between the reservoirs and one in front of.It came with only one reservoir. IE one missing.
A quick trial fit shows that it should clear the cowl brace and steering box and it does fit the firewall bolt spacing. My 2.8 is not fitted yet, but it should clear the valve cover.
I've not yet checked the line sizes or bore size, but I think I'll go with this in the absence of the Nissan cylinder!

 

[weaselkeeper]

Am curious how this mc fit. I can't located an f10 anywhere so was looking at other options. Can you post or pm me with a progress check or some pics? Thanks in advance.

I recently receive a mc that was supposed to be for an f10, but the outlets were on the bottom and fouled the steer box.

 

[robertf]

 

[weaselkeeper]

Perfect. Thank you.

 

[DanR]

Robertf what is the part number for your master cylinder in the PIC you POSTED??

 

[weaselkeeper]

Have had troubles finding any colt MCs in 11/16. No bueno.

 

[racerguy99]

I ordered mine from O'Reilly's. P/N 11-1713. Obviously, I ain't got it in yet. It does have "11/16" cast in it...

 

[gdive]

Hi racer. Back in the 80s I adapted a stock 70s Ford non-power MC to my Alpine firewall and it worked fine. At the time I had stock disc on the front and drum on the back. I ran one port to the original booster and used it for the front and the other port connected directly to the line that went to the back axle. So the fronts had power assist, the backs were just pedal power. I have since installed rear disc and went to an ABS brand electric pump style system that works awesome. I never found the Sunbeam brakes to be that great and I have had my car for 30 years, with various braking system mods done to it.