1996 850R Doing PCV.. what is this hose?

[dmack87]

Hello,

There is a hose that attached beneath the vac line tree on the manifold. it runs over by the battery and under the air filter housing, and then up to a fitting on the firewall near the brake lines.

Here is where it attaches on the manifold:

another view:

here it is running to a connector near the air box:

and here is the hose connecting to the light colored fitting on the firewall:

Questions:
What is this hose?
It is in pretty rough shape, should I replace it?
What is the purpose of the connector under the filter housing, and it is it needed?

Thanks!

Darren

[misha]

Looks like brake booster vacuum line.
Yep...it is.
What connector under air filter box,i don't see it?There is cruise control under airbox.

[Ben850]

Brake assist.
Mushy, or stiff pedal on braking lately?
Replace. Or cut the end of the hose for a clean connection.

After cutting an inch from the hose, I did replace the OEM spring clamp

After looking at my photo from that day, I should look a closer to see if I had put a clamp on that hose.
Brakes are working well for the past 6,000 miles or so?

I will check tomorrow. many miles to come this summer.

You are obviously dealing with a turbo manifold, seeing the third nipple. ( Giggity)

Safe to clamp them all. Spring clamps work, as the OEM type.

[dmack87]

Replaced the hose up to the hose coupler under the air filter housing. Probably should replace the remaining stretch up behind the brake booster, but access looks like a nightmare. Maybe someday. Thanks for the hose ID.