M416a1 Surge Brake Reservoir Cap

[jime]

How does one remove the reservoir cap on the surge brake?

 

[Evil Dr. Porkchop]

It should unscrew normally (counterclockwise).

 

[jime]

Okay, Thanks. Tried that, so it must be frozen. I was afraid to force it.

***UPDATE*** It was no match for a torch, pipe wrench, and a steel tube for torque! Needless to say, i need a new cap. I'll be getting the one with a hex fitting on top.

 

[Tinstar]

NOS ones are $20 and includes o-ring.

Mine was smashed almost flat and kinda molded to the cylinder. Did not come off easily.

 

[SLOrazorsedge]

That's the upgrade vent cap. The hex plug requires a large tubing loop overhanging the surge brake reservoir as a vent. Everyone of those versions I've seen are smashed flat. The mushroom cap vent works great, just make sure you have the OEM "O" ring.

 

[Evil Dr. Porkchop]

The m416a1 TM shows both the cap pictured above as well as a short cap with the hex fitting (no tube). Both my a1s had the hex style, while both of my NOS m416a1 surge brake assemblies have the mushroom cap. The version with the tube that SLOrazorsedge mentioned is also a direct swap since the surge brake internals are all the same between m101a2/a3 brakes and the m416a1.

 

[Chief_919]

FYI if you need a master cylinder this one is a perfect fit and function for a lot less than trailer stores sell them for. I have replaced M101A2 and M416A1 master cylinders with that one.

 

[Chief_919]

And here is just the cap for $25- but if you are dropping $25 on a cap at that point if it was just me I would go ahead for a few bucks more and just replace the whole master cylinder.

 

[jime]

NOS ones are $20 and includes o-ring.
Mine was smashed almost flat and kinda molded to the cylinder. Did not come off easily.
View attachment 694001

Who sells that cap?

EDIT: Duh! Guess I should read ALL the replies! Thanks guys!

 

[Tinstar]

Check classifieds here

Several on eBay
All of mine were still sealed in military wrapping