Question about 1981 Ford F 150

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Vacuum leak sort of sound coming from the general area of the vacuum booster on my 1981 Ford F-150 w/ 300"six cylinder and 4sp. It stops when I apply the brakes fully.

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Boost probably has small pin hole, they do go bad...

Posted on May 24, 2011

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Check the hose and the rubber around the vacuum booster the best way i found a leak was to
take a 3ft peace of fuel line and put 1 end up to my ear and take the other end and probe
around the motor or ware ever i could here a vacuum leak you don't have to use fuel line any hose will do

i hope this helps you
bob

Posted on May 24, 2011

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2 Answers

When i press the brake pedal on my 2003 chevy tahoe there is a loud whooshing sound, what is causeing this?


maybe the vacuum booster behind the master cylinder. is the vacuum hose hooked up to it?? it could be leaking internally. you need a vacuum pump to test it though.

Jul 17, 2017 | Cars & Trucks

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Why is there an air leak in master cylinder area?


air leaking noise is coming from master cylinder area
Haroon, The booster is hooked up to a vacuum line off the engine or should be. Get your self a mechanics stethoscope to locate and repair leak.

Mar 30, 2016 | Cars & Trucks

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--car stalling


sound like major vacuum leak.Brake booster if power brakes

Dec 30, 2013 | Cars & Trucks

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Brake pedal hard to push in on 1981 Ford F 100 what cause that


A hard brake pedal is caused by a failed and leaking vacuum diaphragm in the power brake vacuum operated booster. Another reason is loss of vacuum to the brake booster, buy you should hear a loud sucking noise, also the 3/8" vacuum hose can collapse from age check that as well.

Feb 24, 2012 | Ford F-100 Cars & Trucks

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My 1981 ford f100 brake light comes on when I come to a stop but goes off when I start accelerating?


check the brake fluid level, there is a float in the resavor when you stop all the fluid moves to the frount of the resavor causing the float to drop and turn on the light. fill the master cylinder with DOT 3 brake fluid.

Jan 12, 2012 | 1981 Ford F 100

2 Answers

The brake pedal is hard to push during stopping


OK, a hard brake pedal is a good thing, in general. But, if the booster is not giving full power due to a vacuum leak, then stopping performance will be diminished due to the lack of vacuum assist.

Make sure the booster is holding vacuum by shutting off the car, locating the booster under the hood at the firewall, between the master cylinder and the firewall.

After a few minutes, remove the check valve from the booster by pulling it out. You should hear a loud swoosh of air going into the booster. If not, the booster may have a leak in it, or the check valve is not working.

Good luck on diagnosing the hard braking problem.

Nov 12, 2010 | 1999 Suzuki Vitara

1 Answer

Ford Ranger 1994 breaking system just stopped working. No tension on pedal and on checking no brake fluid.


2 places to check 1. look at the rear wheel backing plates for moisture 2. pull the master cylinder back and look for fluid in the vacuum booster. if leaks at the rear its going to be rear wheel cylinders which will require replacing wheel cylinders and shoes. if the vacuum booster is full replace the master and booster.

Dec 28, 2009 | 1994 Ford Ranger Supercab

1 Answer

WHEN I TURN MY CAR OFF IT MAKES A HISSING SOUND FROM WHAT SOUNDS LIKE ITS COMING FROM THE BREAK FLUID AREA


possibly a broken or leaking vacuum hose. not likely to be the vacuum booster. with the car running at idle go listen under the hood for a whistling sound. if you hear one start putting your hand over hoses in that area until it stops. then replace that line.

Oct 03, 2009 | 1996 Ford Crown Victoria

1 Answer

Brakes seem to "let up" when trying to come to a complete stop, does not do it when only slowing, like during highway driving


It sounds like you may have a vacuum leak. The brake booster stores enough vacuum to give you pedal assist when stopping. The supply is not unlimited. Sometimes there is a cannister to increase the reserve and the cannisters look like a coffee cans and rust through. Or the brake booster (big round thing) behind the master cylinder can leak. There is also a valve on the supply line which can leak.

To test these areas technicians use a gas like propane while the engine is running and use a hose to route the gas around the seams of the brake booster, supply valve, and backup cannister I mentioned.

When the gas is drawn into the engine, the rpm will increase and you will know there is a leak. The propane will not hurt the engine and some states check emmisions with propane as well.

You may want to do a vacuum test of the engine to see if it is putting out enough to give you good braking.

Sep 14, 2009 | 1999 Ford Explorer

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