Master Cylinder upgrade

major519 · Post by **major519** » Tue May 24, 2011 5:23 pm

I am currently inspecting my brake system on my M38A1 CDN3.
I was just wondering if it has been discussed here before re: master cylinder upgrade.
I take it that Jeeps used the old style single stage M/C and thought that someone must have come up with a current upgrade to a dual stage system?
Any thoughts?

bl5211a · Post by **bl5211a** » Tue May 24, 2011 7:19 pm

I would also be interested in any upgrades from single to dual.

Bretto · Post by **Bretto** » Tue May 24, 2011 8:21 pm

They do make and sell a dual circuit master cylinder kit.

for example:
http://www.kaiserwillys.com/product/229 ... ccessories

bensunday · Post by **bensunday** » Tue May 24, 2011 9:22 pm

The 68 and up CJ5 came with an under the floor dual master cylinder from the factory.

Herm the Overdrive guy offers a very good kit with options on the master cylinder itself.

http://www.hermtheoverdriveguy.com/

MODIFIED · Post by **MODIFIED** » Tue May 24, 2011 11:02 pm

interesting, I've been toying with the idea of fabbing a custom (non-evasive ) bracket to install a Wilwood 1" tandem. looks like it can be done..

herms kit, requires you delete the inner frame section that supports the stock set-up which entails grinding the rivets that support the bracket from the frame.

major519 · Post by **major519** » Wed May 25, 2011 7:35 am

Does anyone have an appropriate master cylinder part number to do a conversion like this?
Herms conversions seems ok as does kaisers but I too don't want to cut away originality if I can get away without doing so.

Post by **wesk** » Wed May 25, 2011 7:46 am

Just ask your auto parts guy for a master cylinder for a 1971 CJ5.

ocwd · Post by **ocwd** » Wed May 25, 2011 8:20 am

Does this upgrade improve the braking or is the Jeep still pretty much limited by the 9-inch drums?

Bretto · Post by **Bretto** » Wed May 25, 2011 8:44 am

Safety upgrade. If one circuit fails, you have the other.

major519 · Post by **major519** » Wed May 25, 2011 11:20 am

I see that many of you fellows in the US opt for 11" drum upgrades.
I suppose I am fortunate enough to have a CDN3 version which came out in 1970 and was factory fitted with 10" drums and automatic adjusters...
I am suprised that they retained the old single stage M/C while upgrading the brake system from that found on the 1967 CDN2 version.

major519 · Post by **major519** » Thu May 26, 2011 3:35 pm

I was also wondering if there is a requirement to fit a proportioning valve into the system or am I OK to just change from a single to a dual cylinder setup???

Master Cylinder upgrade

Master Cylinder upgrade

Brakes