I've got a vacuum leak from the brake booster connector on the intake manifold:

You Tube

(I've put another video of the leak at the end)

Question:

I'm debating whether to replace the whole assembly or just the red bit.

Is it easy to get just the red bit out?

It's cheaper to just buy this LR052965 for $25:



I've heard that to replace the whole assembly you need to push a rod down the throttle body, which seems more intensive?

And the whole thing LZN100220L costs around $55 here in Australia:



Another video of the vacuum leak:

You Tube

 

The red piece isn't separate. To get it out you have to remove the entire assembly. Pushing it out with a long extension (or any other rod, really) is not "intensive."

 

Gotcha, do you reckon there's a chance of damaging the whole thing when pushing it out to replace the red bit?

Assuming that I can order it separately as LR052965 means it's removable?

 

Yes, it's removable. Just push it out. No real chance of damaging it unless it's in there really tight or it has become really brittle.

 

Hey mollusc, your statement is curious. The red ring comes out of the fitting quite readily on my truck. Always has. I've also grabbed a couple as spares from local boneyard trucks. Same situation; they came out easily.

I don't recall ever seeing or reading about a leak from that fitting.

When I broke the red ring on my truck 15 years ago, I did a field repair by splitting a nylon grommet I had on hand using a razor blade (like the ones pictured, as close to one side as possible) and substituted it for the red ring. It sealed perfectly for a couple years at least, until I found a replacement red ring on a boneyard truck. I've also read a few accounts here of people removing the red ring and sealing the vac pipe in the fitting with RTV. You could try that as a interim solution.

If you remove the red ring and it looks okay, that indicates the problem is likely with the main body of the fitting. Given that, I'd replace the whole thing (LZN100220L). You likely know this, but to remove the vac pipe from the fitting push IN on the red ring while pulling the vac pipe OUT. (I wish I'd known that 15 years ago.) The red ring should then come out easily.

And by the way, are the prices you quoted in USD or AUD? The part costs about the same here in USD, so if your price is in AUD at the current exchange rate ($1.49) you're getting a bargain in real terms!

 

Thanks mate! That’s super helpful!

I’ll have a go now! So your red thing also has a small black thing connected to it like in my photo?

Good idea! Thanks, that works best actually as I’ve got some silicone handy in case I bugger the red thing when removing

 

No. It's simply as shown in my pic.

 

None of the red rings on my three trucks have come out at all. I haven't tried removing the entire assembly because I haven't had problems with them.

 

Weird.

 

Even though it may come apart it's not supposed to come apart. Replace the whole part is the correct repair. Technically speaking. I'm sure if you put it back together and it holds, it's prob fine too or put different ones together and they hold, that's fine too. I've had them come apart and put them together without issue.