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Discussion Starter · #1 ·
Hello All,
Recently got new calipers installed on my 2000 TJ Sport, all was working fine until last week when I had trouble started the engine. Once I got it going the RPMs went through the roof, 4-5k, and when I tried taking it around the neighborhood the brakes were basically non-existent (had to stand on the peddle to stop).

Get it back in the driveway, pop the hood and it looks like some components are missing. I noticed some type of hose cap on the brake booster appears to be gone, and I’m not even sure what’s going on with the vacuum lines at the intake manifold. One was loose; I’m pointing to it in a picture, and there’s a lonely black hose that seems to be missing a connection.

What do you guys think? As always, any help is greatly appreciated.
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This guy is the brake booster check valve. Your cap and check flap are missing. With this gone, you cant build a vacuum in your booster, causing your brakes to feel useless.
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It should look like this....
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The second dangly hose goes to your EVAP purge solenoid. I believe this only needs to see vacuum from the manifold as the line leads into the VAC port of the solenoid.
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The brake booster check valve as boondaba has pictured is probably available at a parts store. The loose pipe you have your finger on I think should have a ninety degree rubber elbow connecting it to the rusty tube to the left of it in your picture. The elbow that is loose, if the rubber isn't decayed would snug tight with a cable tie. It's a vaccuum hose so won't get blown off, and just needs to seal well enough to stop air getting sucked in.
 

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If the elbow is bad, you can just use a piece of vacuum hose of the correct size, just make it long enough to get a good radius without a kink. And, like stated above, can use cable ties around the ends like a hose clamp.
 

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Discussion Starter · #5 ·
This guy is the brake booster check valve. Your cap and check flap are missing. With this gone, you cant build a vacuum in your booster, causing your brakes to feel useless.
View attachment 4139780

It should look like this....
View attachment 4139781


The second dangly hose goes to your EVAP purge solenoid. I believe this only needs to see vacuum from the manifold as the line leads into the VAC port of the solenoid.
View attachment 4139782
Thanks man, I really appreciate the help. Still baffled by how these things went missing; was driving fine the day before.
 

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Discussion Starter · #6 ·
The brake booster check valve as boondaba has pictured is probably available at a parts store. The loose pipe you have your finger on I think should have a ninety degree rubber elbow connecting it to the rusty tube to the left of it in your picture. The elbow that is loose, if the rubber isn't decayed would snug tight with a cable tie. It's a vaccuum hose so won't get blown off, and just needs to seal well enough to stop air getting sucked in.
Thanks for the help! It's almost like the check valve and elbow blew out somehow after having trouble getting the motor started that day; weird. I'll definitely be securing the loose elbow with a cable tie; great tip.
 
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