IDI vacuum pump junk
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
Make certain the vacuum system has no leaks. Often a leaking brake booster will kill a vacuum pump.
Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
If your other stuff is sealed, a hard pedal in the morning after sitting is a good indicator. Your first push after it sits should have travel to the floor. If its hard, you have a leak somewhere. Experiencing it now, with an AAP lifetime warranty booster. I bit the bullet and bought sufficient vacuum hose to connect the booster directly to the pump (to eliminate possibilities in the old plastic diverter deal and the old hose). As of right now, I either have a leakdown in the booster or the pump itself. It rears its head after sitting for 10+ hours.
Mountain Pass
Joined: Apr 2021
Posts: 144
Likes: 16
From: Fratt, TX
If your other stuff is sealed, a hard pedal in the morning after sitting is a good indicator. Your first push after it sits should have travel to the floor. If its hard, you have a leak somewhere. Experiencing it now, with an AAP lifetime warranty booster. I bit the bullet and bought sufficient vacuum hose to connect the booster directly to the pump (to eliminate possibilities in the old plastic diverter deal and the old hose). As of right now, I either have a leakdown in the booster or the pump itself. It rears its head after sitting for 10+ hours.
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Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
I bought 8' because I didn't want to measure. I ended up using roughly 7', and there is still slack. I basically routed it then cut off excess.
At O'Reiley's, the only parts store that carried it around here, 8' was about $20. I was surprised that more parts stores didn't have the vacuum hose in bulk, but I guess its usually a pretty short run on most vehicles.
At O'Reiley's, the only parts store that carried it around here, 8' was about $20. I was surprised that more parts stores didn't have the vacuum hose in bulk, but I guess its usually a pretty short run on most vehicles.
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Mountain Pass
Joined: Apr 2021
Posts: 144
Likes: 16
From: Fratt, TX
I bought 8' because I didn't want to measure. I ended up using roughly 7', and there is still slack. I basically routed it then cut off excess.
At O'Reiley's, the only parts store that carried it around here, 8' was about $20. I was surprised that more parts stores didn't have the vacuum hose in bulk, but I guess its usually a pretty short run on most vehicles.
At O'Reiley's, the only parts store that carried it around here, 8' was about $20. I was surprised that more parts stores didn't have the vacuum hose in bulk, but I guess its usually a pretty short run on most vehicles.
Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
My truck is a bare bones manual, so I didn't need to split the line. The only thing coming off the vacuum tree is, I think, a line for the low vacuum warning. Or I have no idea what that thing is. But it doesn't seem to matter.
If I was going to split it, I would just do it wherever it was most convenient. But if you just want to test it, you can bypass everything and run straight to the booster. Run it, then let it sit. I know I also bit the bullet and bought a vacuum gauge to confirm low vacuum when my original pump went out.
If I was going to split it, I would just do it wherever it was most convenient. But if you just want to test it, you can bypass everything and run straight to the booster. Run it, then let it sit. I know I also bit the bullet and bought a vacuum gauge to confirm low vacuum when my original pump went out.
Logistics Pro
Joined: Nov 2013
Posts: 3,928
Likes: 1,198
From: Mojave, Ca
The vacuum pump also operates all the HVAC controls in the cab. Running the vac pump to the brake booster directly would eliminate all the HVAC diverter controls. I believe you'd only have "defrost" setting if it doesnt have vacuum.
Mountain Pass
Joined: Apr 2020
Posts: 189
Likes: 25
Yeah. Everything is manual in an 86', or at least my 86'.
Mountain Pass
Joined: Apr 2021
Posts: 144
Likes: 16
From: Fratt, TX
LUCKY!! i wish mine was that way, way more reliable hey possum your trucks twin is up the street from me... ill see if i can get a pic LOL
Mountain Pass
Joined: Apr 2021
Posts: 144
Likes: 16
From: Fratt, TX
this is true because when i 1st start up my truck thats all that it has until higher rpms are reached, i want to split it for more brake reliability and to test the brake booster. i might have replaced my vac pump when it didnt need it as a result of a leaking booster but im not hearing any hissing sound from the booster so i dont know if it has a leak or not??