Brake Whistle
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Senior User
Joined: Feb 2010
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From: Lake of the Ozarks
Brake Whistle
When I depress the pedal, most noticeably at a stop while idling, I hear a very audible whistle (kind of wolf-whistle pitched) that comes and goes with added or removed pressure on the pedal, and sounds like it is coming from the engine bay. This doesn't happen until after driving for a good 15-20 minutes.
I have power brakes, but they appear to not be a stock setup:
I can't see or feel any leaks, and will check tonight with someone else depressing the pedal... but was wondering if anyone has had/heard of similar issues. Thanks in advance for any input.
I have power brakes, but they appear to not be a stock setup:
I can't see or feel any leaks, and will check tonight with someone else depressing the pedal... but was wondering if anyone has had/heard of similar issues. Thanks in advance for any input.
Senior User
Joined: Aug 2009
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From: Bolivar, MO>
sounds like you possibly have a vacuum leak in the line to the brake booster, the rubber grommet at the booster or inside the booster itself. you should be able to hunt it down if you warm it up and get your buddy to press the brake pedal while you look for it!
Postmaster
Joined: Dec 2003
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From: Clarksville,Tn
Glad to see someone had good luck!
Mitch
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Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
I still would like to know what kind of brake system you have with the booster on the fender apron.
John
John
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From: Simi Valley, CA
These were installed in 1955/57 Thunderbird's because there wasn't enough space on the firewall to mount the usual booster/master cylinder combo.
F500 and larger trucks used Hydro-Vac's. They were usually mounted under the truck on the frame rail.
All 1953/66 Studebaker cars/pickups used a Hydro-Vac.
Laughing Gas
Joined: Dec 2009
Posts: 938
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From: Bishop, CA
I once owned a '61 GMC Carryall that somebody had swapped a 390/FMX into. They also added the Hydro-vac to it. Those things are a PITA when the check valve fails.
Locked the brakes down, 20 miles from home, in the rain, 6 month old twins strapped into the back seat. Ruined the brake drums and shoes before I got her home.
Locked the brakes down, 20 miles from home, in the rain, 6 month old twins strapped into the back seat. Ruined the brake drums and shoes before I got her home.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
A remote mounted booster like this is known as a Hydro-Vac.
These were installed in 1955/57 Thunderbird's because there wasn't enough space on the firewall to mount the usual booster/master cylinder combo.
F500 and larger trucks used Hydro-Vac's. They were usually mounted under the truck on the frame rail.
All 1953/66 Studebaker cars/pickups used a Hydro-Vac.
These were installed in 1955/57 Thunderbird's because there wasn't enough space on the firewall to mount the usual booster/master cylinder combo.
F500 and larger trucks used Hydro-Vac's. They were usually mounted under the truck on the frame rail.
All 1953/66 Studebaker cars/pickups used a Hydro-Vac.
John
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Senior User
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From: Lake of the Ozarks
Below is quoted from Bill(numberdummy) on 9/2009
Ford offered factory or dealer installed power (drum) brakes on 1965/66 F100/250 2WD's.
Page 28 in the 1966 Car/Truck Accessory Brochure sez:
"The answer to increased braking power, responsive pedal action with real brake "feel" extra power for faster, surer straight line stops: C6TZ-2A091-C $47.00.
However, the power booster is mounted in the usual spot...on the firewall.
Autoparts stores, brake shops offered a "universal" power brake kit. The power booster is a Hydro-Vac.
A Hydro-Vac (NOT a Hydro-Boost) is a remote type of power brake booster, basically it can be mounted anywhere.
For one example, 1955/57 T-Birds had these mounted on the left fender apron, because there was no room for a conventional booster to be firewall mounted.
If the OP's truck has a frame mounted booster, it's a Hydro-Vac.
btw: When you get your 1964/72 truck parts catalog look here: Illustrations ~ Section 23 ~ Page 8. The entire setup is shown.
Page 28 in the 1966 Car/Truck Accessory Brochure sez:
"The answer to increased braking power, responsive pedal action with real brake "feel" extra power for faster, surer straight line stops: C6TZ-2A091-C $47.00.
However, the power booster is mounted in the usual spot...on the firewall.
Autoparts stores, brake shops offered a "universal" power brake kit. The power booster is a Hydro-Vac.
A Hydro-Vac (NOT a Hydro-Boost) is a remote type of power brake booster, basically it can be mounted anywhere.
For one example, 1955/57 T-Birds had these mounted on the left fender apron, because there was no room for a conventional booster to be firewall mounted.
If the OP's truck has a frame mounted booster, it's a Hydro-Vac.
btw: When you get your 1964/72 truck parts catalog look here: Illustrations ~ Section 23 ~ Page 8. The entire setup is shown.
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