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I have 0 vacuum on 69 Charger #1485748 08/17/13 03:05 PM 08/17/13 03:05 PM
Joined: Sep 2003 Posts: 268 St. Paul, MN 4 440 4 me OP enthusiast
440 4 me OP enthusiast 4 Joined: Sep 2003 Posts: 268 St. Paul, MN	I have a 69 Charger 440. It is mostly stock. I rarely drive the car. Took it to the local cruise last night. The brake pedal was rock hard. The car falls on it's face if you punch it. This morning I put a vacuum gauge on it. It reads 0 at the inlet on the carb. Reads only 3 pounds at the brake booster. What are the common things I should check that would cause low vacuum?

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485749 08/17/13 04:13 PM 08/17/13 04:13 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	which port on which carb are you getting a zero reading? Is that at idle? Low vac from a massive vacuum leak but more info as something is missing live every 24 hour block of time like it's your last day on earth

Re: I have 0 vacuum on 69 Charger [Re: RapidRobert] #1485750 08/17/13 04:24 PM 08/17/13 04:24 PM
Joined: Sep 2003 Posts: 268 St. Paul, MN 4 440 4 me OP enthusiast
440 4 me OP enthusiast 4 Joined: Sep 2003 Posts: 268 St. Paul, MN	Getting 0 vacuum at the port at the front/base of the carb. Carb is stock is most everything else on engine.

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485751 08/17/13 04:27 PM 08/17/13 04:27 PM
Joined: Jan 2003 Posts: 5,363 Rancho Cordova, California (Sa... hemi71x master
hemi71x master Joined: Jan 2003 Posts: 5,363 Rancho Cordova, California (Sa...	Take your reading at the vacuum port, on the back of the intake manifold. RF-4C Phantom 69-370 Zweibrucken, Germany

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485752 08/17/13 04:32 PM 08/17/13 04:32 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I just took my AVS out to the garage so I dont have it in front of me on the kitchen table to check it but I would assume that that front mini port nipple is "ported" & would (& should) have zero vac at idle. 3 in hg at the booster ain't right tho & definitely will not activate the booster but I'm not seeing (yet) how it could be that low. Where are you mounting the gauge? live every 24 hour block of time like it's your last day on earth

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485753 08/17/13 04:33 PM 08/17/13 04:33 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	timing chain jumped???

Re: I have 0 vacuum on 69 Charger [Re: Dodgem] #1485754 08/17/13 04:37 PM 08/17/13 04:37 PM
Joined: Jan 2003 Posts: 5,363 Rancho Cordova, California (Sa... hemi71x master
hemi71x master Joined: Jan 2003 Posts: 5,363 Rancho Cordova, California (Sa...	Quote: timing chain jumped??? X2 Severely retarded timing. RF-4C Phantom 69-370 Zweibrucken, Germany

Re: I have 0 vacuum on 69 Charger [Re: hemi71x] #1485755 08/17/13 04:42 PM 08/17/13 04:42 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	yup when they jump back a tooth they sure loose power and vacuum + the timing moves the same number of degrees back!

Re: I have 0 vacuum on 69 Charger [Re: hemi71x] #1485756 08/17/13 08:29 PM 08/17/13 08:29 PM
Joined: Sep 2003 Posts: 268 St. Paul, MN 4 440 4 me OP enthusiast
440 4 me OP enthusiast 4 Joined: Sep 2003 Posts: 268 St. Paul, MN	Found a hose that had a crack in the center... I get about 13 pounds of vacuum. Still not enough to make the brake booster work properly...

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485757 08/17/13 08:42 PM 08/17/13 08:42 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	You might bump the initial up a bit to up the vacuum keeping in mind that that may require dist mods (springs, slots) to compensate. live every 24 hour block of time like it's your last day on earth

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485758 08/17/13 11:35 PM 08/17/13 11:35 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	13 inches of vacuum is more than enough something else must be wrong.

Re: I have 0 vacuum on 69 Charger [Re: Dodgem] #1485759 08/17/13 11:50 PM 08/17/13 11:50 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: 13 inches of vacuum is more than enough something else must be wrong. Good point live every 24 hour block of time like it's your last day on earth

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485760 08/18/13 10:21 AM 08/18/13 10:21 AM
Joined: Jan 2003 Posts: 5,907 Athens, Greece Pyper70 master
Pyper70 master Joined: Jan 2003 Posts: 5,907 Athens, Greece	Quote: Found a hose that had a crack in the center... I get about 13 pounds of vacuum. Still not enough to make the brake booster work properly... Perhaps your brake booster needs a rebuild. I have 10" vacuum and I have plenty of brake power. Do you have a vacuum canister hooked up to the manifold? My 69 needs to have a vacuum pump because of the cam, the power brakes, and the headlight system.. One thing at a time though Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s

Re: I have 0 vacuum on 69 Charger [Re: RapidRobert] #1485761 08/19/13 12:39 AM 08/19/13 12:39 AM
Joined: Sep 2003 Posts: 268 St. Paul, MN 4 440 4 me OP enthusiast
440 4 me OP enthusiast 4 Joined: Sep 2003 Posts: 268 St. Paul, MN	My guess is the brake booster is just shot. Any suggestions on how to test it? I was trying to think of what I could use to run vacuum directly to the booster. My hand held "Mityvac" has enough pressure, but does not draw enough volume. Assuming I do need a new brake booster, does anyone have suggestions as to where to get a correct one? The car is fairly correct so I would want to get to get a booster that has the correct yellow zinc (if that is what the coating is).

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485762 08/19/13 12:50 AM 08/19/13 12:50 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	To test the brake booster for leaks, securely plug the vacuum line feeding it and see if the problem persists. For the booster, I'm running a Cardone reman. It is (or was) available at an AP store. It is the correct type and cost effective but has black anti-rust coating and no new plating.

Re: I have 0 vacuum on 69 Charger [Re: ahy] #1485763 08/19/13 10:46 AM 08/19/13 10:46 AM
Joined: Sep 2003 Posts: 268 St. Paul, MN 4 440 4 me OP enthusiast
440 4 me OP enthusiast 4 Joined: Sep 2003 Posts: 268 St. Paul, MN	When I disconnect the booster and block it's line the vacuum gauge does not change. So it does not seem like the booster is leaking. However, the brakes are really hard to push with the vacuum line connected. I get about 10 - 13 pounds vacuum so I would think that would be enough to make it work. Can anyone recommend where I can buy a booster that is original appearing and is not crazy expensive (aka YearOne - they want $499 for theirs).

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485764 08/19/13 10:50 AM 08/19/13 10:50 AM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Rock Auto and Napa sells them reman for a lot less. Last edited by Supercuda; 08/19/13 10:52 AM. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: I have 0 vacuum on 69 Charger [Re: 440 4 me] #1485765 08/19/13 09:18 PM 08/19/13 09:18 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Quote: When I disconnect the booster and block it's line the vacuum gauge does not change. So it does not seem like the booster is leaking. However, the brakes are really hard to push with the vacuum line connected. I get about 10 - 13 pounds vacuum so I would think that would be enough to make it work. Can anyone recommend where I can buy a booster that is original appearing and is not crazy expensive (aka YearOne - they want $499 for theirs). Vacuum is commonly measured in inches of mercury. In round numbers, 30 in mercury = 15 psi. 10 psi vacuum would be 20 inches mercury which is very good for a healthy engine and stock cam. Agree more than enough for power brakes.

Re: I have 0 vacuum on 69 Charger [Re: ahy] #1485766 08/19/13 10:23 PM 08/19/13 10:23 PM
Joined: Feb 2005 Posts: 4,318 Prospect, PA BSB67 master
BSB67 master Joined: Feb 2005 Posts: 4,318 Prospect, PA	I suspect that he is mis-speaking and means 10-13 inches Hg.

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