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Shop Kaiser Willys

Master Cylinder Brass Outlet Fitting (2 port)
Fits 41-66 MB, GPW, CJ-2A, 3A, 3B, 5, M38, M38A1

Part # A557

New Replacement Master Cylinder Brass Outlet Fitting.

Has 2 port 3/16" thread.

Replace your corroded outlet fitting on your original frame mounted master cylinder. Helps evenly proportions fluid to your wheel cylinders. Both front and rear steel frame brake line sets screw directly into this fitting.

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

Part # Price





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have same ? as others .fitting that was removed is single port ... one shipped to me is dual port. whats the fix on this?

Willys Jeep Parts Tech:
Please email some more vehicle information and we can help out. Thanks!

I have a 63 cj5 and this fitting on my jeep only has one port. Do you sell them or do I use the dual port and plug one. If so do you sell the plug too?

Willys Jeep Parts Tech:
The single port fittings you have to reuse your old one.

I’m installing a new master cylinder and want to replace this fitting but mine only has one port. Do you sell those? Would I need to use this and plug one of the ports?

Willys Jeep Parts Tech:
Please email more vehicle info and we can help out. Thanks!

My brass fitting looks the same but has threads to screw in Master cylinder Can’t tighten anymore is this the correct fitting? 1964 M38A1

Willys Jeep Parts Tech:
637605 is the outlet bolt that has the threads for it to screw into the master cylinder.

The brass fitting on my '61 CJ-3B only has one port. The front/rear splitting T is elsewhere. Can I get the single port T or should I buy the dual port and re-run the steel lines?

Willys Jeep Parts Tech:
That was used on later CJ-3B's. We can help you get a good used junction if you like. Please call and ask for Mike M.

Will the outlet ports on this fitting match up with the 3/16" inverted flare fitting on a brake line?

Willys Jeep Parts Tech:
Yes, both are 3/16" like original.

When replacing the fitting which way do you put the small/large openings? Does the large opening go to front or back brakes? small opening front or back brakes?

Willys Tech:
This is not the proper fitting for your Willys Truck. You want part number 637603 which has the two different sized ports.

Do I need to order two of this fittings or it comes with both?

Willys Tech:
There is only on the vehicle. Just qyt one.

how much is shipping on this fitting?

Willys Tech:
It this is all you need we can ship it out via USPS priority Mail for $6.99
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