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Shop Kaiser Willys

Disc Brake Dual Reservoir Master Cylinder Kit
Fits 46-64 Truck, Station Wagon

Part # 376897

New Dual Reservoir Master Cylinder Conversion Kit for DISC BRAKES ONLY

Free Shipping on oversized item!!

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

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

The proportioning valve has a brake light switch built in the top.

This master cylinder kit is intended to install to your Jeep withouth cutting or grinding. 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. You will retain your factory original master cylinder bracket. Its as simple as it gets!!!




Helpful Guides and Illustrations:
Dual Reservoir Conversion Kit - Install Guide
Proportioning Valve - Install Instructions
Master Cylinder Proper Bleed Procedure

For vehicles with original 11" drum brakes

1946-64 Truck
1946-64 Station Wagon

Please allow 2-3 weeks for delivery.

Part # Price





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What’s the bore size of this master cylinder

Willys Jeep Parts Tech:
Pretty sure its 1" but will need to check.

I have a 1960 willys truck with front disc and rear drum brakes. It looks like one of your dual master cylinder kit was installed years ago. Do you sell a replacement master cylinder and proportioning valve?

Willys Jeep Parts Tech:
Give us a call and we can help you. Thank you!

Does this kit come with MC. push rod plunger ,if not what part number would I need to order ?

Willys Jeep Parts Tech:
See part number: 637599

Proportion valve instructions say front of MC goes to front brakes connections ,But the larger reservoir go to front brakes correct ?

Willys Jeep Parts Tech:
Larger reservoir goes to the front.

I have a 1969 CJ5 V6. I already have disk on my front brakes. I ordered your rear disk brake kit a few days ago. Will this reservoir work on my Jeep? It says it's for a 46-64 Truck/Station Wagon.

Willys Jeep Parts Tech:
See part number: 376896 for your vehicle. Thanks!

Is the port with the larger resivior for the front brakes? Where is a good place to put the proportioning valve?

Willys Jeep Parts Tech:
Yes, the larger reservoir is for your front brakes. Any typically along the frame rail is where people do it to keep protected.

I have a 1948 Willys PU with 16" stock rims. I've read there might be clearance problems for the calipers with these rims?

Willys Jeep Parts Tech:
We do recommend that you use aftermarket rims for clearance.

I never got the prop valve

Willys Jeep Parts Tech:
Please give us a call. Thanks.

Just purchased a front disc break conversion kit. I should also get thr master cylinder as well, yes? A 1955 willys station wagon.

Willys Jeep Parts Tech:
376897 is what you need.

the proportioning valve in the instructions and the one pictures in the item appear very different. The one in the instructions has separate outs for left and right front. And you run one outlet up to the T on the axle? Or, do you have to run new lines to left and right?

Willys Jeep Parts Tech:
We now are using an improved fully adjustable prop valve. Please email to help.

Will this master cylinder run both front and rear disc brakes at the same time without a booster?

Willys Jeep Parts Tech:
This is for disc / drum set up. If you have disc / disc set up call us toll free. We can get the proper prop. valve for it at same price.

This says for for front disc conversion only. What do I need if doing front and rear disc brakes?

Willys Jeep Parts Tech:
376898 or 376891 is the rear kit depending on Willys. The master cylinder conversion would be 376897 or 376896 depending on Willys.

Can you identify a dual master cylinder set up for 49 Jeepster with front disc brake conversion (GM S10) & 68 Ford Mustang 8" rear with disc brakes?

Willys Jeep Parts Tech:
Please email and I can try to help you. Thanks!

Is the kit supposed to come with the rubber boot on the back of the master? Theres one pictured but is not in the kit I received.

Willys Jeep Parts Tech:
The new kits we send out dont come with them but they really are not needed. I can get one out to you at no cost though if you like. Please email and i'll take care of. Thanks!

Does this kit come with a proportioning valve or is it sold seperate? Or do I need one?

Willys Jeep Parts Tech:
Yes, it does come with the kit. Scroll right thru the images and you can see it as well.

I have a 45 GPW but for legroom I added exactly 8" in the floor and door jam openings right in the middle of the opening. Can you make a top that has an extra 8" in the front part of the top and also for the doors?

Willys Jeep Parts Tech:
We can work with you. Please call and ask for me Mike M. or email me

I'm planning on switching my 1959 willys cj3b over to disc brakes will I need a brake booster with this conversion?

Willys Jeep Parts Tech:
You will need a disc dual reservoir kit part number: 376896

Will this fit a 49 Jeepster?

Willys Jeep Parts Tech:
No sorry, this will not work for the Willys Jeepster.

Does this have the break switch connections on the front like the old one?

Willys Tech:
You will line in a brake light switch.

I'm planning on switching my 64 willys pickup over to disc brakes will I need a brake booster with this conversion?

Willys Tech:
A booster is not necessary.
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