M101A3 brake help

[bubbahana]

Can anyone tell me what is missing here

Thanks!

 

[3dAngus]

Overflow/vent tube?

 

[KsM715]

Yep. Its just a piece of tubing bent in a "U" with a rubber hose pointing to the ground.


Edit: pic added. This is from a M105 but its the same thing.

 

[Ratch]

What he said...

 

[bubbahana]

Awesome! Thanks guys

 

[Ratch]

I don't mean to hijack the thread, but just wondering about this.

I've picked up a few trailers that had breather or vent-caps instead of tubes.

Anyone know why they used different vent styles, and which is superior? I can't figure out what the more recent style is, seems like trailer age makes no difference.

I thought the vent-cap was better...mostly 'cause there's no tube waiting to get sheared...

 

[KsM715]

I have the vent cap on mine. It looks like this trailer was refurbished at one point, (new brake handles and a patch welded in alont the front of the box where they usually rust thru) So Im guessing the vent cap may be a newer item.

I had another one (that I sold) that has a vent cap and it was smashed flat by something. (fork lift I'm sure) It was smashed so bad that the sides of the cap were bent over the master cylinder making it very hard to remove and replace. The vent tube looks like an easy 5 min fix.

 

[coyotegray]

The purpose is for expansion.

If the breaks are use enough it will cause the fluid to heat up enough to cause both the air in the reservoir and the fluid to expand causing the breaks to be applied. So, a vent tube allows the expansion or some have a mushroom looking cap that has an expansion chamber inside for the same purpose but in my opinion are better because the system is sealed...

 

[86humv]

All the M101A2's I seen had the mushroom cap, and A3's had the vent tube/hose.

 

[mrfishaholic]

vent cap is the upgraded version

 

[therealsundance]

I've has A2s with both the cap and vent hose.