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Shop Kaiser Willys

Master Cylinder Push Rod Plunger
Fits 48-66 CJ-2A, 3A, 3B, 5, 6, M38, M38A1

Part # 647606

New Master Cylinder Push Rod Plunger

Push rod eye bolt and eyelette from brake pedal arm into master cylinder.

48-49 CJ-2A
49-53 CJ-3A
53-64 CJ-3B
55-66 CJ-5
50-52 M38
52-66 M38A1::

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On an M38 about how far from the floor is the brake pedal on full pressure?

Willys Jeep Parts Tech:
This is a loaded question. Ultimately you are looking for about an inch of free pedal travel.

What is the overall length?

Willys Jeep Parts Tech:
These are adjustable. Please email your vehicle information and we can go from there. Thanks!

Is there a retainer to hold the plunger in place? Mine pulls away from the master cylinder and will not stay engaged with the piston.

Willys Jeep Parts Tech:
Make to double check your free pedal travel. That sounds like the issue.

My old push rod does not seem to be long enough and it is not adjustable (Rusted beyond moving). First, how much will this push rod adjust, and how do I know when it is adjusted correctly? Thanks

Willys Jeep Parts Tech:
You want 1" of free pedal travel. That is how you know. The push rod is theaded and adjustable.

Is this the correct one for the Aluminium master cylinder found on some 3A's/M38's?

Willys Jeep Parts Tech:
Yes, this is the correct plunger for all Willys listed above.

I have been involved in a project for too long now. jeep basket case one problem after another. Trying to do the brakes not only does the master cylinder not fit but now I find the pushrod is way short. - that is what I assume. the brake pedal sits way down by the engine block before it does anything which leads me to believe that there is a difference in brake pushrod lengths especially considering two listings in descriptions for pushrods. Am I correct?

Willys Tech:
Yes, there is a small difference in push rods from vehicle to vehicle model. That is why we list different ones. CJ-2A did you two different style master cylinders (805223 or A556) and two different push rods (647606 or A183) from what you've written above sounds like that is what you have.
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