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Dual Reservoir Master Cylinder Conversion Kit
Fits 41-71 Jeep

Dual Reservoir Master Cylinder Conversion Kit
Fits 41-71 Jeep

New Dual Reservoir Master Cylinder Conversion Kit

This kit is an important safety upgrade from a single reservoir braking system.

The kit includes a dual reservoir master cylinder, mounting brackets and all required fasteners and instructions.

You will need a 3/8" drill bit, a double flare tool, or a buddy with a double flare tool to modify your existing brake lines. Its as simple as it gets!!!

However, you will have to run all new steel lines.

Helpful Guides and Illustrations:
Dual Reservoir Conversion Kit - Install Guide

For vehicles with original 9" drum brakes

Fits:
41-45 MB
41-45 GPW
46-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-66 CJ-5
50-52 M38
52-66 M38A1

Item # Price
805223-CJDUAL
$299.99

Availability: In stock

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Questions & Answers

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Questions: I want to put this on my 1952 M38. I understand I need to run either a couple new brake lines or buy at Napa. Do you sell the needed lines? And what is the part number for the new brake light switch?
Question By: Tom Allsberry on Nov 19 2018 6:16 PM
The brake light switch is the same as the original, part number 647801. And for the brake lines, you just go to a local Napa and buy the pre-flarred lines and bend them to fit. Thanks
Answer By: Willys Jeep Parts Tech on Nov 19 2018 11:04 AM
Questions: Hello, I have a 1951 M38. I am in the process of converting the front to 11" drum brakes from 74 CJ5. So I will have 9" in the rear and 11" drum brakes in the front. This kit should work fine correct?
Question By: Robert Beausoleil on Jun 4 2018 7:50 PM
Yes, this kit will work for your drum / drum set up.
Answer By: Willys Jeep Parts Tech on Jun 5 2018 5:51 AM
Questions: Can you send me the video link on the installation of the master cylinder disc break conversion? I need to see the mounting of the master cylinder, the video I watched shows cutting away the old mounting system! I can’t seem to find it! My Willys is the 52 m38a1 on
Question By: Lawrence Thompson on May 18 2018 6:26 PM
I'm sorry but I don't have a video on it but this guide should do the trick: https://www.kaiserwillys.com/media/wysiwyg/805223-CJDUAL_1.pdf Please give me a call toll free at 888-648-4923 if you have any other questions. Thanks
Answer By: Willys Jeep Parts Tech on May 18 2018 12:36 PM
Questions: I have a 63 CJ5 that I have done a disc brake swap on the front. Do you offer this kit with a master cylinder that is set up for front discs and rear drums?
Question By: Michael Smith on Apr 7 2018 8:06 PM
376896 is the part number.
Answer By: Willys Jeep Parts Tech on Apr 9 2018 5:56 AM
Questions: Will this DUAL RESERVOIR MASTER CYLINDER CONVERSION KIT work with a 1956 DJ 3A with a column shift transmission?
Question By: Philip Davis on Apr 1 2018 9:16 PM
Sorry, the bolt pattern is different for 2x4.
Answer By: Willys Jeep Parts Tech on Apr 2 2018 6:03 AM
Questions: Will this work on a 46 cj2a with an 11in brake upgrade?
Question By: Joseph on Jan 2 2018 10:30 PM
Yes, this will work for a drum brake set up.
Answer By: Willys Jeep Parts Tech on Jan 3 2018 5:43 AM
Questions: Will this unit fit a 1969 CJ5 V6?
Question By: Scott Thomas on Oct 5 2017 5:50 PM
This master cylinder is only for vehicles with 9" brakes. The CJ-5 with a V6 typically had 10" brakes. Thanks
Answer By: Willys Jeep Parts Tech on Oct 6 2017 4:51 AM
Questions: I am looking for a set up like this for 49 jeepster. Do you have any thing.
Question By: Wayne H White on Oct 3 2017 12:56 AM
Sorry, no dual reservoir kit is make for the Willys Jeepster.
Answer By: Willys Jeep Parts Tech on Oct 3 2017 5:44 AM
Questions: I have 1947 CJ2A willys. will this work and if so, do i need anything else additional. Thanks
Question By: Chris R. Laird on Sep 19 2017 9:26 PM
Yes, this does fit. You will just need to run new lines to it. See install instructions above as well.
Answer By: Willys Jeep Parts Tech on Sep 20 2017 5:46 AM
Questions: How do i attach the brake light sensor?
Question By: David Cefali on Sep 12 2017 2:47 AM
You just put the brake light switch anywhere inline that has pressure.
Answer By: Willys Jeep Parts Tech on Sep 12 2017 5:55 AM
Questions: When mine is installed, the large reservoir is toward the back, but i thought that was the front line reservoir. Are the lines supposed to cross? Or do I have it wrong and the smaller reservoir goes to he front (which doesn't make sense to me)
Question By: Steven on Sep 11 2017 12:33 AM
If you can please call us toll free and we can help with install. See link above too for our install instructions in item description.
Answer By: Willys Jeep Parts Tech on Sep 11 2017 10:46 AM
Questions: I have a 1953 CJ3B with 11' drum brakes in the rear and disc's up front. Will this work with this set up? Thanks
Question By: Eric Eggen on Aug 7 2017 7:49 PM
376896 is what you would want to order for a disc/drum set up.
Answer By: Willys Jeep Parts Tech on Aug 8 2017 6:01 AM
Questions: Do you have a dual master cylinder that would be appropriate for use with a front disc conversion on a 64 CJ5 and would a proportioning valve be needed?
Question By: Tim Coons on Jul 14 2017 5:11 PM
The proper disc brake master cylinder for the CJ-5 is part number 376896. Thanks
Answer By: Willys Jeep Parts Tech on Jul 14 2017 11:30 AM
Questions: I own a GPW the guide states I will need a "later pedal shaft bracket riveted style" do you have a part number for this handy?
Question By: Clark moss on Jun 30 2017 4:13 PM
645086
Answer By: Willys Jeep Parts Tech on Jun 30 2017 11:03 AM
Questions: I am rebuilding rear 9" drum brakes and installing new front disc brakes on 1956 CJ 5. Will this dual reservoir master brake cylinder work in this application? Do I need a proportioning valve of some kind with this set up? Thanks
Question By: Tom Elder on May 27 2017 3:17 AM
If you're installing disc brakes than you should use the disc brake master cylinder: https://www.kaiserwillys.com/disc-brake-dual-reservoir-master-cylinder-kit-fits-41-71-mb-gpw-cj-2a-3a-3b-5-m38-a1 Thanks
Answer By: Willys Jeep Parts Tech on May 27 2017 6:53 AM
Questions: Why don't you offer the ( Wilwood I think ) Dual Reservoir Master Cylinder Conversion Kit that is in your 2014 catalog? Shown as item #805223-CJDual upper left hand corner on page 82.
Question By: Tom on May 19 2017 9:41 PM
This is a more updated version. We have not had any issues with this master cylinder. Thanks!
Answer By: Willys Jeep Parts Tech on May 22 2017 5:21 AM
Questions: I have a 1958 Willys CJ3-B right hand drive. I believe it was delivered from the factory in Queensland Australia as right hand drive. can you tell me if the dual master cylinder conversion will fit my vehicle ??
Question By: Graham Ward on Jan 9 2017 4:02 AM
Sorry this kit is for left hand drive only.
Answer By: Willys Jeep Parts Tech on Jan 9 2017 5:48 AM
Questions: I have a 48 CJ2A. I have a new original master cylinder, replaced front brakes to 11in. rears are still 9in ... Still hard to stop. Will this dual master cylinder help ... or should I upgrade to 11in in the back? If so what part # do I need for the conversion?? Thanks for your time.
Question By: Kevin on Aug 9 2016 9:03 PM
This master cylinder should help some with that. I would also consider our disc brake conversion kits we sell as well.
Answer By: Willys Jeep Parts Tech on Aug 10 2016 5:47 AM
Questions: Am currently installing this on my 1957 M38A1, with new break lines and cylinders, what DOT fluid type can i use now ? thanks
Question By: abdullah alsalem on Aug 9 2016 7:47 AM
We use DOT 3.
Answer By: Willys Jeep Parts Tech on Aug 9 2016 5:47 AM
Questions: would this fit on a M38A1? thanks
Question By: abdullah alsalem on Jun 9 2016 11:02 AM
Yes, this would be the correct part for your Willys Jeep M38A1.
Answer By: Willys Jeep Parts Tech on Jun 9 2016 6:06 AM
Questions: I assume that this fits under the floor just like the original. I have a 71 CJ with a dual reservoir master cylinder sized for drum brakes. Does this provide the additional fluid volume for the disc brake setup. Do you have diagrams of the installation?
Question By: Dick on Jan 1 1970 12:00 AM
See above there is an install guide link. They go in basically the same spot as your frame mounted master cylinder.
Answer By: Willys Tech on Apr 1 2015 12:00 AM
Questions: I have a 1953 CJ3B and want to replace the brakes with your upgrade kit, what skill level does it take? I'm very mechanically minded being a lineman for 37 years is this a job some one can get through having never done brakes before( I'm retired so time isn't a factor).......Dan
Question By: Dan on Jul 11 2014 12:00 AM
Please see the install instructions. It is not too hard of a process.
Answer By: Willys Tech on Jul 14 2014 12:00 AM
The installation itself is pretty easy, but cutting out the original MC mounting bracket so it'll fit isn't. Make sure you have the tools to cut through fairly thick metal. Once that bracket is out, it's pretty smooth from there.
Answer By: Steven on Sep 11 2017 12:27 AM
Questions: works with discs in both axes?
Question By: marcos on Jun 23 2014 12:00 AM
This is for drum/drum set up. We do sell a disc dual res. master cylinder part number: 376896
Answer By: Willys Tech on Jun 24 2014 12:00 AM
Questions: I have a 1946 Jeep Willy. Can/should I use this kit on my Jeep? And what is a double flare tool?
Question By: Gavin Brady on Jun 14 2014 12:00 AM
If you have a CJ then this is the kit for you. Your local Napa will have a flare tool kit to make the lines.
Answer By: Willys Tech on Jun 16 2014 12:00 AM
Questions: Does the kit come with a dust boot for the MC pedal shaft? If not what PN do we used? Thanks
Question By: Mike on Nov 8 2013 12:00 AM
These do not require a boot.
Answer By: Willys Tech on Nov 11 2013 12:00 AM
Questions: The frame mounted master cylinder is less than desirable on my 1944 Willys army Jeep. It is difficult to get to to add fluid and seems to fail often. Is there such a thing as a conversion kit for a dash mounted master cylinder combined with an uplift brake pedal?
Question By: Dick Mesa on Mar 16 2013 12:00 AM
You should have an access cover on your floor board to add fluid to. It would be pretty hard to get a under dash to work for the Jeep.
Answer By: Willys Tech on Mar 18 2013 12:00 AM
Questions: Do you sell the kit without the master cylinder?. I have the master already.
Question By: Ben on Mar 10 2013 12:00 AM
Please call us toll free. We probably can get the brackets by themselves.
Answer By: Willys Tech on Mar 11 2013 12:00 AM
Questions: This master works on a 1956 CJ5?
Question By: Anonymous on Feb 20 2013 12:00 AM
Yes that is correct. It goes for all the vehicles listed above.
Answer By: Willys Tech on Feb 20 2013 12:00 AM
Questions: can I use the front and rear brake line kits that kaiser willys sells and just build the frame brake lines? If so, what do you recommend for the frame lines. I would like to buy lines that are already flared since I don't have a flaring tool.
Question By: daryl on Dec 1 2012 12:00 AM
Yes that is correct. This will not affect the front or rear lines and our kits will work. Your local NAPA sells predetermined length preflared lines. You can easily make them off of that.
Answer By: Willys Tech on Dec 3 2012 12:00 AM
Questions: Hallo,i have buy this kit at your services but can you give me an connecthing diagram of schema to install this?
Question By: Patrick on Jan 1 1970 12:00 AM
Please see above at the install instructions link.
Answer By: Willys Tech on Jul 9 2012 12:00 AM
Questions: What's your average ship time on this product.
Question By: corey on May 3 2012 12:00 AM
We typically try to ship same day.
Answer By: Willys Tech on May 4 2012 12:00 AM
Questions: I have a 1960 Willys L-226 utility truck will the master cylinder kit work on this model for the dual resourvior conversation. And do you carry a sterring column shaft for this model also. Thank you.
Question By: Paul R. on Apr 6 2012 12:00 AM
Try part number: 805223-WODUAL for your Willys Truck. That will be the correct one.
Answer By: Willys Tech on Apr 6 2012 12:00 AM
Questions: Will this unit also fit a RHD CJ6, 1960?
Question By: Steve on Jan 13 2012 12:00 AM
These are for left hand drive vehicles only.
Answer By: Willys Tech on Jan 13 2012 12:00 AM
Questions: I'm new to this. Why do you need new brake lines? Will the brake light switch still attach? Thanks
Question By: Anonymous on Oct 7 2011 12:00 AM
You just have to rebend your lines to this one and put an inline switch in.
Answer By: Willys Tech on Oct 7 2011 12:00 AM
You can also opt for a mechanical brake light switch. There are several that have the same brake light connectors as the original
Answer By: Steven on Sep 11 2017 12:24 AM
Questions: Will this work on a 1967 CJ5? At the top in looks like it's covered but in the fits part it's not
Question By: Scott on May 20 2011 12:00 AM
Yes it should work as long as you have a frame mounted master cylinder.
Answer By: Willys Tech on May 20 2011 12:00 AM
Questions: What if there are no existing holes to mount the bracket for the duel master cylinder conversion kit
Question By: Steve mueller on Apr 28 2011 12:00 AM
The kit comes with the mounting brackets.
Answer By: Willys Tech on Apr 29 2011 12:00 AM
Questions: i already have the correct master cyl, will you sell just the bracketry?
Question By: Anonymous on Apr 9 2011 12:00 AM
Possibly. Please call us toll free. We are more than happy to help out.
Answer By: Willys Tech on Apr 11 2011 12:00 AM
Questions: Won't work with an 11 drum upgrade?
Question By: Anonymous on Jan 11 2011 12:00 AM
Yes, it should work just fine if you have upgraded to 11 to the original 9.
Answer By: Willys Tech on Jan 12 2011 12:00 AM