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67 Mustang brake booster pedal issue
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Cselle
New User
Jan 5, 2025, 1:17 PM
Post #1 of 6
(110 views)
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67 Mustang brake booster pedal issue
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I have a 67 Mustang with front disc and rear drums, new brake booster, new master cylinder, and new prop valve. The brake pedal does not come to the top with brake booster vacuum attached, but it does when disconnected. All hoses are new, master cylinder has been bench bleed, and each wheel has been bleed starting the with farthest. Brake booster hose is connected to back of Edelbrock Carb, but i can’t get the pedal to come to top. What could be the issue?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 5, 2025, 2:13 PM
Post #2 of 6
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Re: 67 Mustang brake booster pedal issue
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I'm not understanding what you mean. Are you saying you have a higher "applied" brake pedal with vacuum disconnected? If so, that is normal.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Cselle
New User
Jan 5, 2025, 2:41 PM
Post #3 of 6
(99 views)
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Re: 67 Mustang brake booster pedal issue
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I’m saying my brake pedal is not at the top when the vacuum hose is connected. It sits about half way and I can pull up on the pedal for it to go to the top. With the hose disconnected it does come to the top, which i know is normal. I’m wondering how to correct the problem with it not coming to the top
(This post was edited by Cselle on Jan 5, 2025, 5:01 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 5, 2025, 7:32 PM
Post #4 of 6
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Re: 67 Mustang brake booster pedal issue
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Sorry, I didn't get a notification when you replied.
What happens when you step on the pedal with vacuum connected? Do you have a normal pedal or does it go to the floor?
Is there check valve on the vacuum hose at the booster?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 5, 2025, 7:37 PM)
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Cselle
New User
Jan 6, 2025, 8:13 PM
Post #5 of 6
(35 views)
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Re: 67 Mustang brake booster pedal issue
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The pedal goes half way down when pressing the brake with the vacuum line attached. There is no check valve on the hose. I never had one on the original setup so i kept it the same. I will try adjusting the brake booster pushrod to see if this helps.
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Hammer Time
Ultimate Carjunky
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Jan 6, 2025, 8:20 PM
Post #6 of 6
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Re: 67 Mustang brake booster pedal issue
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Don't mess with that pushrod. It will cause the brakes to build up pressure and lock up and not release.
I believe all boosters use a check valve. This is dangerous stuff you're messing with. You really shouldn't be experimenting with a brake system.
It's normal for a booster to draw the pedal down lower that a non boosted pedal.
Make sure the vacuum source is full manifold vacuum at idle.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 6, 2025, 8:21 PM)
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