Vacuum lines on brake booster. - Mustang Evolution

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Old 02-15-2015, 10:28 PM   #1
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Vacuum lines on brake booster.

I replaced master cylinder and brake booster a year ago. Brakes work, but don't seem to have the power that they should.
Lately, noticed an axle seal leak into the rear drum. So in the process replacing the seal and cleaning up drum. I noticed in the Mustang Shop Manual that they show using both vacuum ports on the check valve for the brake booster with am automatic.
So are both lines supposed to be hooked up to the intake for vacuum? Never noticed this difference before.


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Old 02-16-2015, 12:48 AM   #2
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When I bought my booster kit it just came with a valve with one port on it


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Old 02-16-2015, 08:17 AM   #3
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Mine has the extra port with a cap on it. Click image for larger version

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Puzzling.


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Old 02-16-2015, 10:25 AM   #4
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I may be easy of from what you are asking, but the circled component in the drawing is the fitting on the booster. The house with clamp comes from the intake manifold. The other hose on an automatic goes to the vacuum shift modulator. Sorry if I got the question wrong.

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Old 02-16-2015, 12:38 PM   #5
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I've got the large booster hose connected to the intake. I've got the tranny hooked to the intake. I'm not sure what the other connection on the brake booster is for.
I thought for a vacuum canister, but were those installed as stock. Also if that's what it's for, why would you connect to the intake?


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Old 02-16-2015, 02:53 PM   #6
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I agree with you, that's just how it looks in the diagram. Is there a vacuum diagram in the manual that shows where the factory put the modulator hose?

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Old 02-16-2015, 03:07 PM   #7
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I'll check when I get off work. But it seems like on the original manifolds they had a nipple for the C-4. But maybe not. I wonder if the booster would behave differently with the tranny hooked to it in line with it?
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Old 02-16-2015, 03:20 PM   #8
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It's just kind of a signal to the modulator. As long as your vacuum is good, I don't think it would have an effect. Capped off is probably the same result. Just make sure you have a good cap on there. If it's brittle it might be leaking.

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Old 02-16-2015, 03:20 PM   #9
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If it helps I just bought a thunder bird with power brakes and it has that dual check valve and only one line is hooked to it and it is an auto


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Old 02-16-2015, 04:48 PM   #10
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Thanks, I think it's the same difference. During production is was cheaper and faster to uncap a brake booster check valve for an auto instead of adding a nipple to the intake manifold.
So I guess I'm good. Thanks again.
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