The Ford Barn

runewilliam_merc · 09-22-2018, 02:11 AM

Hi!

I have a 1952 Mercury Custom.
To upgrade safety, I would like a dual bowl(?) master cylinder.

I have searched the web as good as I can, but haven't been able to find one.

The bore is 1".

Anyone have any idea?

(Please ignore my bad English, I'm from Norway)

Rune

Mart · 09-22-2018, 03:39 AM

Personally I'd just fit a new stock type, but if you want a 1" dual, a 67 Mustang is a dual with a 1" bore. Rockauto have Merc or Mustang cylinders and from my experience are good for international shipping.

The brake pipe fittings require one with a 1/2"-20 thread and one with a 9/16"-18 thread. You might need external residual valves.

Mart.

51 MERC-CT · 09-22-2018, 06:51 AM

Just about any mid 1960's vehicle (Ford or GM ) with DRUM/DRUM dual master cylinders can be adapted.
They generally have residual valves built in.
This is one example---

https://www.napaonline.com/en/p/NMAM39495

Or this-----

https://www.napaonline.com/en/p/NMAM2056

Robz51 · 09-22-2018, 09:44 AM

I put discs on y 52 merc but before I did that I bought a 67 mustang master cylinder (for drum brakes) and was going to adapt that as it bolts into the existing holes. You can use the Speedway catalog to find parts adapt the actuating rod. Never used it and still have it if you're interested.
Rob

RalphG · 09-22-2018, 10:17 AM

I've seen videos on youtube on updating an older car to newer style dual circuit master cylinder. I just went with a new original style for my 52 from Napa.

40 Deluxe · 09-22-2018, 10:29 AM

Sponsored Links (Register now to hide all advertisements)

Just bolting on a dual master cylinder will not automatically give you the safety factor. You have to make sure there is enough pedal travel to engage the secondary piston in event of failure. This only happens near the bottom of pedal travel. if the pedal hits the floor too soon, you will not have any brakes if front or rear springs a leak.
After you have it installed and bled, open a rear bleeder screw and see if the car will stop with the front brakes (in a safe place). Then repeat with a front bleeder open.
I suspect that at least some of these conversions have never been tested and will result in total loss of braking in event of a blown hose.

09-22-2018, 02:11 AM	#1
runewilliam_merc Junior Member Join Date: Aug 2018 Posts: 28	Master sylinder for 1952 Mercury Hi! I have a 1952 Mercury Custom. To upgrade safety, I would like a dual bowl(?) master cylinder. I have searched the web as good as I can, but haven't been able to find one. The bore is 1". Anyone have any idea? (Please ignore my bad English, I'm from Norway) Rune

09-22-2018, 03:39 AM	#2
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 8,746	Re: Master sylinder for 1952 Mercury Personally I'd just fit a new stock type, but if you want a 1" dual, a 67 Mustang is a dual with a 1" bore. Rockauto have Merc or Mustang cylinders and from my experience are good for international shipping. The brake pipe fittings require one with a 1/2"-20 thread and one with a 9/16"-18 thread. You might need external residual valves. Mart.

09-22-2018, 06:51 AM	#3
51 MERC-CT Senior Member Join Date: May 2010 Location: East Hartford, Ct Posts: 5,898	Re: Master sylinder for 1952 Mercury Just about any mid 1960's vehicle (Ford or GM ) with DRUM/DRUM dual master cylinders can be adapted. They generally have residual valves built in. This is one example--- https://www.napaonline.com/en/p/NMAM39495 Or this----- https://www.napaonline.com/en/p/NMAM2056 __________________ DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES Last edited by 51 MERC-CT; 09-22-2018 at 07:05 AM.

09-22-2018, 09:44 AM	#4
Robz51 Senior Member Join Date: May 2010 Location: Rogers, AR, USA Posts: 141	Re: Master sylinder for 1952 Mercury I put discs on y 52 merc but before I did that I bought a 67 mustang master cylinder (for drum brakes) and was going to adapt that as it bolts into the existing holes. You can use the Speedway catalog to find parts adapt the actuating rod. Never used it and still have it if you're interested. Rob

09-22-2018, 10:17 AM	#5
RalphG Senior Member Join Date: Sep 2014 Location: Sask. Canada Posts: 2,424	Re: Master sylinder for 1952 Mercury I've seen videos on youtube on updating an older car to newer style dual circuit master cylinder. I just went with a new original style for my 52 from Napa. __________________ https://www.youtube.com/user/roosty6/videos

09-22-2018, 10:29 AM	#6
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,778	Re: Master sylinder for 1952 Mercury Sponsored Links (Register now to hide all advertisements) Just bolting on a dual master cylinder will not automatically give you the safety factor. You have to make sure there is enough pedal travel to engage the secondary piston in event of failure. This only happens near the bottom of pedal travel. if the pedal hits the floor too soon, you will not have any brakes if front or rear springs a leak. After you have it installed and bled, open a rear bleeder screw and see if the car will stop with the front brakes (in a safe place). Then repeat with a front bleeder open. I suspect that at least some of these conversions have never been tested and will result in total loss of braking in event of a blown hose.