Power break question
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Power break question
I just power breaks onto my 72' F100. The booster is from a 79 F150. When I hit the brakes, I can here the booster sucking air in through the cab. Is there supposed to be some sort of filter or dust cap to quiet this down?
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I only hear it when I press down the pedal. Once the pedal is down I don't hear it anymore so I don't think it is the diaphram being bad, because I have good pedal feel and power assist. But I could be wrong.
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From: Kernersville, NC
99% sure it's a bad booster.
You shouldn't hear any vacuum at any time when you depress the brake pedal.
Actually, even with a bad booster, you shouldn't hear it sucking from inside the cab if you put the dust boot on right, because a booster from a 79 should be mounted remotely on brackets and it has a bellcrank mechanism to activate it.
You shouldn't hear any vacuum at any time when you depress the brake pedal.
Actually, even with a bad booster, you shouldn't hear it sucking from inside the cab if you put the dust boot on right, because a booster from a 79 should be mounted remotely on brackets and it has a bellcrank mechanism to activate it.
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That's what I am wondering is about the dust boot. All I had with the booster and the master cylinder is a black plastic tube that went from the boster to inside the cab. I am thinking that there is supposed to be another piece there.
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Yes it does and the plastic tube goes around the push rod.
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From: Simi Valley, CA
What would be its purpose?
I've never seen or heard of any such thing. There's nothing like this shown in the parts catalog illustrations either.
The only plastic piece on the rod (at the end) from the booster to the brake pedal...is a bushing used in conjunction with the pedal mounted brake (stop) light switch.
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
What plastic tube routes from the brake booster to inside the cab?
What would be its purpose?
I've never seen or heard of any such thing. There's nothing like this shown in the parts catalog illustrations either.
The only plastic piece on the rod (at the end) from the booster to the brake pedal is a bushing used in conjunction with the pedal mounted stop light switch.
What would be its purpose?
I've never seen or heard of any such thing. There's nothing like this shown in the parts catalog illustrations either.
The only plastic piece on the rod (at the end) from the booster to the brake pedal is a bushing used in conjunction with the pedal mounted stop light switch.
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From: Kernersville, NC
I don't see it in the illustrations manual, but there is a tube approximately 3 in long x 1.5 in diameter that goes between the booster and the firewall.
The booster is mounted remotely from the firewall. This tube surrounds the push rod and seals the booster to the firewall.
I'll look a little further tonight and see if I can find a part number or illustration.
The booster is mounted remotely from the firewall. This tube surrounds the push rod and seals the booster to the firewall.
I'll look a little further tonight and see if I can find a part number or illustration.
Ford Parts Specialist
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From: Simi Valley, CA
A lot of trucks had the plastic tube some also had rubber no ford part number but all the ones I have seen say bendix like the booster. It was just a dust cover and seal. The new reman boosters use a ribbed rubber boot to cover up the back of the booster and the push rod on the booster. The seal just prevents dirt and moisture from entering the moving parts of the booster.
C3TZ2180A = is shown in the 1964/72 & 1973/79 truck parts catalogs for Midland Ross boosters on F350's.
Nothing is shown for the Bendix Booster.
I've never heard of a dust boot refered to as a plastic tube.
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70_RangerXLT = 1973/79 Ford Light Truck Parts Catalog = Illustration Section 23, page 11 = 1974/79 booster & mounting parts.
Good luck finding this supposed tube. I looked in three parts catalogs, 1964/72 truck / 1973/79 light truck / 1973/79 passenger car: Zero, nada, nyet, non, nein.
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From: Kernersville, NC
I'm not sure what the correct description would be according to Ford, but it does exist. As I said before, I don't see it in the illustrations manual, but I'll look again tonight. This tube should have been used on all of the F100/250/350 trucks that used the Bendix booster.
It's not exactly a "dust boot". It's a plastic "tube" that has a flange and a seal on each end. The "tube" fits inside the booster and inside the hole in the firewall, and the flanges keep the tube from sliding into the hole. There is a seal on each end of the tube. This seals the booster to the firewall and encloses the push rod. The length of the tube corresponds to the distance between the firewall and the remotely mounted booster.
It's not exactly a "dust boot". It's a plastic "tube" that has a flange and a seal on each end. The "tube" fits inside the booster and inside the hole in the firewall, and the flanges keep the tube from sliding into the hole. There is a seal on each end of the tube. This seals the booster to the firewall and encloses the push rod. The length of the tube corresponds to the distance between the firewall and the remotely mounted booster.
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From: Sacramento, CA.
7279Ford, the other possibility is that you have a crack somewhere between the booster and the engine, and it just sounds like it is coming from inside.
If the booster you have is supposed to have a bracket behind it to space it away from the firewall, then maybe the rod is pushing too far into the booster opening a hole somewhere.?????
If the booster you have is supposed to have a bracket behind it to space it away from the firewall, then maybe the rod is pushing too far into the booster opening a hole somewhere.?????
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What you have described as the 3" x 1.5" plastic tube is exactly what I am talking about. You guys said that there are 2 seals that go on this tube and I have none. So I think that is what my issue is. I am having a hard time understanding how my booster could be bad when once the truck is stopped the air sound is gone. If the diaphragm was bad wouldn't you continue to hear the vacuum of the engine sucking air in from the cab? Also the air sound can only be heard when I am putting around the neighborhood or in a parking lot. I am more concerned with sucking in something into the booster than the noise and sounds like I am missing 2 seals.