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Vacuum leak around o-ring on front of power brake booster. Can o-ring be replaced and if so,how? Vehicle is 2007Toyota Tundra Double Cab 4x4 5.7L .

O-ring is behind lower connector for Electrical Wiring harness attached to front of booster. O-ring is popping out from base of connector allowing vacuum leak.

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  • Stephen Burke Jan 23, 2013

    Already checked with dealer. Service manager says I need to replace whole Power Brake Booster



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  • Toyota Master
  • 3,103 Answers

Consult the service dealer for details or get an "exploded view"from the parts store and it may show the process for you..

Posted on Jan 21, 2013


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SOURCE: chevy s10 broken vacuum line

I have the same problem, did you get a solution or a diagram?

Posted on Jul 31, 2008

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SOURCE: how do i repair the power brake vacuum booster

There is no repairing the booster you have to buy a rebuilt booster unless you can cut weld and crimp in the diagram, but before you replace it try replacing the check valve that the hose connects to going into the booster. That is available for about ten bucks.

Posted on Aug 31, 2009

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SOURCE: how do i know if brake booster is gone ? 2001 gmc

Do you by any chance hear a hissing noise from under the dash? If so, yes, you have a bad booster. For it to do what you're saying, it would almost have to have a vacuum leak. However, if there is a problem with something in the ABS system, you should have an ABS warning light on. Also, ABS can make the pedal fade, but I've never heard of it making the pedal hard. Your diagnosis of a brake booster does sound likely, but I'll admit I can't be sure -- this is an odd one.

Posted on Mar 10, 2010

Testimonial: "thanks, heard a hissing that i thought was coming from under the truck -- have to check tomorrow - actually my father's truck. have to get back there"

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SOURCE: I have a '97 F250 diesel with about 180K. The

Make sure the calipers are not locked down on the rotors.

Posted on Jun 20, 2010

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On a 97 gmc truck when you push the brake you can hear air from the brake booster into the cab of the truck and brake travels freely to the floor

When a vehicle is turned off, the brake pedal should remain firm. However, if the driver pushes the pedal lightly and it sinks to the floor, the master cylinder has an internal leak.

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Where does the vacuum line off brake power booster go to

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Even after replacing front and rear brakes, the pedal goes nearly to the floor (but does stop the vehicle). What do I need to do

Brake booster has gone bad or u have a vacuum leak. Check the seals for leaks around booster where the. Fluid goes in the plastic holder. Check for vacuum leak going to break booster

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My boyfriends Toyota Tundra is leaking brake fluid. Sometimes a horrible white smoke billows out of the exhaust pipe just after starting up the truck. It quits after a few minutes. Where do you think the...

The white smoke has nothing to do with the brake fluid loss. Look around the brake master cylinder, brake lines and joiners and brakes for signs of moisture. They should all be clean and dry any build up of dirt could be a hydraulic leak. The white smoke is more likely from warn valve guides.

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How to fix brake booster " ?"

You will need to replace the booster. Unbolt the master cylinder from the front of the booster under the hood, then go inside of the cab and under the dash unhook the actuator rod from the brake pedal and remove the 4 nuts that hold the booster to the firewall. Then make sure to unplug the vacuum line from the booster under the hood and pull the master cylinder off of the booster being careful not to kink the brake lines. The booster should come right off.

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Hissing sound coming through boot on brake pedal of 2005 ford escape. Is the brake booster leaking

A hissing sound when depressing the brake pedal is an indication that the booster is leaking. Another indication is that the pedal will be more difficult to push down before starting the car after it has been sitting for a while. A faulty brake booster will only make it more difficult to apply the brakes. However, it should be noted that a leak in the booster may be caused by brake fluid leaking from the master cylinder into the booster and this could become a dangerous problem.

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there is a vacuum booster for the brakes under the hood. if pressing the brake pedal changes the idle rpms, i would initially think that it is vacuum related and would check the booster or the check valve which generally plugs between it and the intake manifold. if the booster is leaking you generally can hear it hiss. it is the double pie pan shaped contraption between the brake master cylinder and the firewall.

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Stiffness of brakes and barley working

Double check the level in the master cylinder. If this is full the most probable is the vacuum booster. This is the large black cylinder directly behind the master cylinder which is operated by vacuum which when you apply mechanical pressure to the brake system, the vacuum assists you by pulling and making it easier to apply the brakes. If you can "stand" on the pedal and the vehicle stops, this is a most likely cause. 1 thing you can do to verify is to first locate the one and only vacuum line going to the booster and make sure there is no holes or no "hissing" caused by a vacuum leak. Let me know if you need further assistance or directions to replace.

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Air/Hissing Noise from Brake Pedal

this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.

May 06, 2009 | 1995 GMC Suburban

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