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New Master Brake Cylinder
Fits 46-66 Jeep & Willys

Part # 805223

New Master Brake Cylinder.

Comes complete with boot. For early frame mounted vehicles.

Please confirm that both mounting holes are unthreaded like orignal.

Measurement:
Center to Center: 3-1/2"
Overall Length: 7"

Fits:
48-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-66 CJ-5
50-52 M38
52-66 M38A1
46-64 Truck
46-64 Station Wagon
48-51 Jeepster::

 
Part # Price
805223

$54.99

MSRP:

$54.99

MSRP:

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Questions & Answers

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What type of brake fluid do I use in this system?

Willys Jeep Parts Tech:
DOT 3

My 1962 CJ5 all of the sudden seems to only be able to go uphill if in low speed 4x4., otherwise it turns off. Noticed the brake lights were always on, even when the ignition was off. All four calipers where bled out and this help a bit, but the problem is still there. Could this be the master brake cylinder? Could you advise on what to do?

Willys Jeep Parts Tech:
It would be best if you gave us a call to discuss.

The previous owner took off the master cylinder, how do I know if I need threaded or unthreaded

Willys Jeep Parts Tech:
Check the center to center mounting and email mike@kaiserwillys.com. Its in our Q and A posted on the item as well.

How to adjust eccentric on brakes on a 49 Willys Jeep Truck

Willys Jeep Parts Tech:
You turn the eccentrics in and then spin the wheel as you turn it out until you hear drag. Then back off so your not creating friction. Email mike@kaiserwillys.com and we can send you a scan of the mechanics manual on it.

How to bleed master cyclinder 805223 . Bench bleed

Willys Jeep Parts Tech:
See A5510 kit and you bleed it at each wheel cylinder.

Do you sell just the cap for the master cylinder?

Willys Jeep Parts Tech:
You can use part number 7411069 and just plug off the port.

Do I need to vent the master cylinder cap on my M38?

Willys Jeep Parts Tech:
It isnt necessary.

Do I need to vent the master cylinder cap on my M38?

Willys Jeep Parts Tech:
It isnt necessary.

I have a 67 CJ5 made in Canada. I have 10" drum brakes and the frame mounted master cyl as shown. I do not have the dual reservoir unit. Will the 805223 work on my car?

Willys Jeep Parts Tech:
Chances are you have a dual reservoir master. Email Mike@kaiserwillys.com to help out.

I bought one of these for my 1962 cj5, but the old one had a 1/4" side outlet, and this one has a 5/16 front outlet, is a bushing available, or do I have the wrong master cylinder?

Willys Jeep Parts Tech:
Sounds like you have an unoriginal master cylinder on your vehicle. email mike@kaiserwillys.com some pictures.

Do you have a master cylinder for a 1953 Willys Areolark & also looking for the fuel sending unit for this car. Thank you

Willys Jeep Parts Tech:
Please email mike@kaiserwillys.com and we should be able to help.

WHAT IS THE CENTER MEASUREMENT FOR THE 2 MOUNTING HOLES On the same site the answer is 3 3/8 and 3 1/2

Willys Jeep Parts Tech:
3.5"

My 60 willys has a firewall 2 bolt mounted master cylinder. Do you carry it, also what is the correct bore size for the master cylinder?

Willys Jeep Parts Tech:
That would be an unoriginal master cylinder on it. Please email mike@kaiserwillys.com your vehicle info and we can help.

Do you have a master brake cylinder that fits a 1957 FC-150? Thank you. Tom.

Willys Jeep Parts Tech:
Yes, this one - #805223 - is the correct one for the FC-150. Thanks

Will this work for a 58 Willys CJ5?

Willys Tech:
Yes this is the proper one for you. It fits all the vehicles listed above. Thanks!

Do you have a new style master cylinder plug for a 56 CJ5. The original has an oblong raise that accepts a 1" end wrench (if you can get to it) A hex head would be much easier to get ahold of.

Willys Jeep Parts Tech:
Sorry, We cant get just the caps by themselves. We do have new gaskets if you need it.

Hey I have a willys MB 1945 with master brake cylinder FE 2693 .Distance between bolts 86 mm , sice of bolts 9 mm Is this the master cylinder I need

Willys Jeep Parts Tech:
A 1945 MB takes master cylinder A556. Please see that item for measurements.

Do you need to bleed the master cylinder before installing?

Willys Jeep Parts Tech:
Make sure you bleed at all 4 wheels to get any air out of the lines. See part number: A5510

Hello, if I order the "New Master Brake Cylinder Item # 805223" do I need to also order the "Master Brake Cylinder Repair Kit Item # 805654"? It would seem the repair kit parts would already be included in the new master brake cylinder. Thanks.

Willys Jeep Parts Tech:
No, the 805223 is already assembled. That kit is only if your rebuilding your old one.

will master cylander # 805223 fit my 1958 willys cj5

Willys Jeep Parts Tech:
Yes, it is the correct master cylinder originally used.

Working on 52 pickup. New master cylinder and related parts. Pedal is up tight to cowl and cannot get push rod to go further in master cylinder. Could mater cylinder be defective even though its new?

Willys Jeep Parts Tech:
Its probably your free pedal travel setting. Please call me toll free. Ask for Mike M. Im happy to help.

I see two different styles of dust boot in the photos associated with this master cylinder, which one does it come with?

Willys Jeep Parts Tech:
Depends on current stock. Call us toll free and we can check when your ready to order. Both function the same.

I have a 52 M38 and the Brake Master Cylinder has a steel line taped into the cap on the Master Brake Cylinder going to the Air cleaner canister (Water Forging Version)? Is this a custom modification and what is its purpose? Do I need to reconnect this way? Do you have the cap needed?

Willys Jeep Parts Tech:
This is for venting to prevent moisture build up. It is not truly necessary with proper maintenance.

Hi, I have a 1967 CJ5 and my master cylinder looks like this item. However, the description states it is for 46 -66 model year. The master cylinder that your company says belongs on my Jeep is a dual reservoir. Can I use this cylinder on my 67 CJ5?

Willys Jeep Parts Tech:
This is the correct master cylinder for your CJ-5 as long as you have 9" brakes. Typically in '67, the CJ-5s had 10" brakes and had a dual reservoir master cylinder. So, as long as your Jeep has 9" brakes and the master cylinder is mounted under the driver seat of the vehicle, this is the correct one for your application. Thanks

It worked great when first installed but the male connectors were loose and when I tried reconnecting them I accidentally touched the frame causing a spark. Now the brake light does not work. Is there an electrical component inside that maybe shorted out?

Willys Jeep Parts Tech:
647801 is a pressure brake light switch. I would check your connections and probably replace.

This will work on the M170 as well?

Willys Jeep Parts Tech:
After checking into some manuals, this master cylinder will work for the M170. Thanks

I have a 1950 M38 and am missing the long machine bolts where the master cylinder mounts to the frame. Do you sell that part?

Willys Jeep Parts Tech:
Those are a hardware store item.

I am replacing my current master cylinder with the 805223, however the end of my old cylinder is so rusted that i cannot get off the parts. I basically need the part numbers for end of the Master Cylinder where the brake fluid is pushed out.

Willys Jeep Parts Tech:
Here is a link to all the parts: https://www.kaiserwillys.com/diagram/cj-2a-diagrams/brake-diagrams-willys-cj-2a/brake-master-cylinder-41-71-willys-jeep/brake-master-cylinder-41-71-willys-jeep

1956 Willys pickup, My brake pedal goes to the floor and does not return. no brakes are engaged when pedal is on the floor. Return spring is hooked up and master has fluid. Thoughts?

Willys Jeep Parts Tech:
I would double check your free pedal travel and set it properly. You also need to see if your return spring is still there.

I have a 1966 jeep cj5 tuxedo park mark iv will this master cylinder fit

Willys Jeep Parts Tech:
Yes, as long as you have the single action frame mounted master cylinder. It is a direct replacement.

I have a 1950 CJV-35. They only made 1000 of them and some of the parts are from a 3a and some from a 2a. I wanted to rebuild or replace the brakes do you have rebuild kits that I can use?

Willys Tech:
I would want to confirm the brakes you have on there currently. Please call me toll free. I am happy to help. Thanks!

i have a 59 willys station wagon 226 6cyl , would you know the bore size of the original master i would use to go to stock thanks

Willys Tech:
This is the stock master cylinder above. It is a 1 bore I believe.

how do I confirm the serial # for my '48 CJ2A..........it has had an off body restoration

Willys Tech:
http://www.kaiserwillys.com/willys_jeep_serial_numbers

On item 805223 there were two answers on the distance between the 2 mounting holes- 3 1/2 and 3 3/8. Which is it ?

Willys Tech:
It is 3-3/8 like original.

is there a dual master cylinder for my 49 Jeepster

Willys Tech:
You will want to get this part number the original one 805223.

The original break fluid calls for S.E.A. 70 r1.Can I use dot 4 or should I use dot 3?

Willys Tech:
We usually use DOT 3.

Says it comes complete with boot. Does that include the internal parts? Are there any other parts that typically need to be replaced, when replacing the master cylinder?

Willys Tech:
Yes it comes with the boot as shown. It is a complete master cylinder. You may also want to get the fitting, outlet bolt, crush washers, and brake light switch with it as well. We sell all of them.

Will this Fit a 1964 M38A1?

Willys Tech:
Yes, this fits all the vehicles listed above.

Can I get just the cap for the 46-66 Jeep master cylinder?

Willys Tech:
Those are only available good used.

Will this fit my 1949 Willys CJ2A ID # 3j29453.

Willys Tech:
Yes as long as you have a CJ-2 with 2 clearance holes for mounting.

Hi, My brake pedal goes to the floor.The cylinder is full and I bled the lines but did not get brake fluid out of the left rear bleeder. Could this be the plunger in the Master or what do you suggest?? I don't see any leaks. Thanks, John

Willys Tech:
Yes, it is probably a master cylinder issue. You should also check inside by your wheel cylinders on the drum side to make sure your rubber is not dry rot and leaking internally.

I have a leak at the master cylinder on my 48 Jeepester. Where could the leak be coming from and how would it be fixed?

Willys Tech:
If your old master cylinder is still on there then you probably have alot of corrosion. This will do the trick for you.

Will this fit a narrow wheel base 1958 Will Jeep FC-150?

Willys Tech:
Yes that is correct it is proper.

I have a 1947 willys jeep but i need the proportional valve to it i have the rest of the master brake cylinder but where can i find the proportional valve the old one whitch is ruined had the brake light hook ups on it to

Willys Tech:
The part number is A557

Will this fit on a 1953 Willys aero lark?

Willys Tech:
Yes this is correct for the Aero. It is a direct replacement.

Does this master cylinder come with the connector for the brake lights?

Willys Tech:
The brake light switch is part number: 647801

Hello I have a 1964 m38a1 with a brake booster on it someone told me its rare to find brake boosters on them. Will this work with my brake booster and hook up right? Thanks Kevin

Willys Tech:
The booster is unoriginal and aftermarket. Depending on the type of booster im sure this would work ok.

why are the holes unthreaded? do they have to be tapped before use? thanks

Willys Tech:
This is how it was originally. You just run a bolt straight thru it.

Where do I find the serial number on a 48 jeep?

Willys Tech:
On a CJ-2A they are on the firewall next to the oil bath air cleaner on the passenger side.

I notice when I search new master cyclinder for 43 MB the only thing you have by application is a rebuild kit? Is the 46 - 66 Cj's M38 etc. part #805223 really different and will not work or fit on the MB? Thanks

Willys Tech:
The part number you want for a 1941-45 MB/GPW is: A556

Does this come with the cap to?

Willys Tech:
Yes this is complete with cap.

I just need the cap for the master cylinder 1949 CJ3A. Can I just purchase that item?

Willys Tech:
We can probably get just that good used.

I have an early model M38A1 (DoD Sept. 1952) Is there anything special on the early A1's for the Master Cylinder??

Willys Tech:
No, this is the correct one for your vehicle.

Will this master cylinder fit my 1964 Jeep FC 170

Willys Tech:
Yes as long as you are single reservoir.

will this work on 1964 tuxedo park with 10brakes?

Willys Tech:
As long as you have a frame mounted single reservoir master cylinder this should be correct.

Will this unit fit on a 1967 cj5. Why are the holes unthreaded

Willys Tech:
As long as you have 9 brakes with a single reservoir master cylinder mounted on the frame this is the correct one for you.

Is this Part No 805223 suitable for an FC170?

Willys Tech:
Yes that is correct.

I have a 1971 M38A1, will this still fit?

Willys Tech:
Yes as long as you are frame mounted single reservoir with 9 brakes.

I want to put the disc brakes on a 1955 CJ3B. What master cylinder do I use and do you have or need a proportioning valve? Can I use valve from any Jeep vehicle with disc front, drum rear?

Willys Tech:
It is recommended to use a disc master cylinder and proportioning valve. We sell it in kits. Try part numbers: 376896 or 376897 depending on your Willys or Jeep.

how far does adjustable pushrod go into master cyl so i know how far i can adjust it?

Willys Tech:
You want 1 to 1-1/2 free pedal travel.

Is this only the tank or does it come with the insides too (piston, spring, outlet fitting, etc...)?

Willys Tech:
This is the complete master cylinder. The outlet bolt and fittings are separate.

WHAT IS THE CENTER MEASUREMENT FOR THE 2 MOUNTING HOLES

Willys Tech:
It is approx 3 1/2 center to center just like original

Rebuilding an M38A1 1954. Original master cylinder is sloppy. Are kits dependable or should I replace?

Willys Tech:
The master cylinder repair kits are a good option but the bore on your old master cylinder need to be smooth. I always try to steer people towards this new master cylinder. Its just alot easier and new.

What type brake fluid goes into a M38A1 brake system?

Willys Tech:
DOT 3

Is their an upgrade to the orignial master cylinder currently restoring CJ-3B?

Willys Tech:
Sure, you can also use part number: 805223-CJDUAL. However this master cylinder is great and wont give you any problems.

What is the distance between the mounting holes?

Willys Tech:
3 3/8 center to center
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