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P0701 and p0704 2004 ford expedition 4.6 l

I need to know What this problem is and i'm hearing an air sound by my brake and gas pedals when i turn on car and drive around.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: AWD acting like all wheels are locked up

  The clutch in the transfer case is burnt up and fused together therefor binding the powertrain. If you continue to operate it like this it will destroy the front differential and possibly the rear differential. It was most likely cause by the tires not having equal circumference either due to a mismatch of tires (different brands although the same size is indicated on the side wall will have different measurements,I have seen BF Goodrich tires have a different size because speed rating was different although the model was the same) or lack of tire rotation during the life of the tires.. If the measurements are not with in 1/4 inch around the center of the tread this will cause your concern. Tires should always be replaced at all 4 corners on all wheel drive vehicles.

Posted on Oct 19, 2008

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warlock61
  • 659 Answers

SOURCE: FORD BRAKE LIGHT

check the connector at the brake switch located on the brake pedal lever arm if it is ok it is most likely a faulty switch

Posted on Dec 02, 2008

txkjun
  • 409 Answers

SOURCE: brake pedal is hard to push and the car doesn't stop very well

Yes it could be the booster.

Posted on Dec 26, 2008

co7196
  • 3433 Answers

SOURCE: hard brake pedal hear air leaking when pedal pushed

When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

Posted on May 25, 2009

  • 1 Answer

SOURCE: Vibration/Rattling on right side during high speeds

I had a similar problem. The dealer change automatic transmission and differential, but the noise continu. After research on internet i think the problem is the front galiper who create a vibration on the disc wheel and the vibration frequence follow the front axle until interior car. Just press slowly the brake pedal and if the noise stop , that's it the cause i think. I dont change my galiper, but i have a new transmission . :)))

Posted on Jun 04, 2009

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Vacuum leak. Open the hood and try to locate where the hissing sound is coming from. Likely a rotted rubber vacuum hose somewhere.

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Why do i hear air when i press the brake pedal


well, you don't really hear air when you press the brake pedal. You might hear hydraulic fluid going through the valves in the master cylinder, that sounds like air flowing through a vent. But, I assure you, it is not air.

One can press and pump on the pedal when the car is off and hear the 'rush' of fluid which sounds kind of like air rushing out of an inner tube.

It's a common mistake to believe a rush of air is being heard when pushing on the brake pedal.

Aug 26, 2010 | Chevrolet S 10 Cars & Trucks

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Sounded like air coming out of a balloon and then there was no pedal pressure


CRITICAL SAFETY PROBLUM:

You have a brake booster failure.

Its not air coming out its air going in through the brake booster via the Brake peddle linkage. Engine Vaccume leak.

Seek out help and don't drive until it is repaired.


Hope this tip helps.

R/
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Jan 23, 2010 | 2005 Chevrolet Equinox

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Brakes spongy after shop replaced rotors braked pads on 2001 buic


Sounds like air is still in the brake lines, the air sound that you hear is the power assist, but the brake pedal needs to be "high and hard".

if the pedal goes to the floor, that is not good. Sometimes, when pumping brakes for bleeding purposes, the master cylinder gets damaged, as the piston goes past it's normal "travel zone" and gets damged on deposits.....

Now, with that being said, if everything was perfect, brakes are typically not as firm after replacement, due to differences in new pads/shoes and old rotors and drums. Pedal to the floor, however, is never okay.

Doc

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1996 GMC Jimmy, flutters when in idel


You could have a cloged EGR valve on the jimmy, which can be removed and cleaned with carb or injector cleaner which you can buy at any parts store.
As for the air leak on the brake system on the truck. That's bad and needs to be replaced or repaired, taking a guess that the sevice brake valve gaskets may be bad.
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Apr 08, 2009 | 1995 GMC Jimmy

1 Answer

GAS PEDAL


Check all the vacuum lines,sounds like one of them has split, or come off. Have somebody press the pedal while your listening under the hood to see if you can find where the air is coming from.
Just press the pedal enough to hear the air.

Jan 28, 2009 | 2001 Ford Taurus

1 Answer

Hissing sound from brake pedal of Renault Scenic 2001


Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.

Jan 22, 2009 | 2000 Renault 181

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