Question about 1997 Chevrolet K1500

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When I step on pedal I get a vacuum leak sound under the dash.Have to push real hard on pedal for brakes to work. I'm not sure where all the air assist parts are. Is there a hose that might have cracked or - - - - -

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The vacuum operated power brake booster is leaking, replace it, four bolts on the inside of firewall plus two to take the master cylinder loose..

Posted on Sep 09, 2009

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You have a break boaster on the firewall. The rubber hose may be leaking or the boaster itself.If so replace.

Posted on Sep 09, 2009

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Sounds like the brake booster itself is leaking past the seal inside the only way to fix is replace booster

Posted on Sep 09, 2009

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Good job guys your all right

Posted on Sep 11, 2009

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HI

MAY BE THE BRAKE BOOSTER IS LEAKING OR SOMETIMES THE HOSE. BETTER TO REPLACE THE BOOSTER

Posted on Sep 20, 2009

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1 Answer

Have 1991 ford taraus power brakes are hard to push in ; no brakes whats my problem? how do I test power brake booster ?


Not alot of actual tests but first is the hose that goes to it connected and does it have strong vacuum when vehicle is running? Next get under dash by pedals push brake pedal, can you hear air leaking? Tests are inconclusive probably needs booster either way.

Apr 06, 2015 | Ford Cars & Trucks

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2003 trail blaizer abs press brake pedal its hard sounds like vacuum leak under dash


your brakes are what is called power brakes if your vechile did not have power brakes it would be hard to push the brake pedal down the power brake booster is ran off vacume from the motor if your booster is bad it will give a hissing sound or simalar there not hard to replace but you have no tools or experince dooing repairs like this its best left to a shop.

Aug 28, 2011 | 2003 Chevrolet TrailBlazer

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Rock hard brake peddle and stopping real hard.


Sounds like you may have a bad power brake booster which is what you master cylinder connects to. It is done my vacuum and should have a large vacuum line attached to it so check that hose from the booster to where it attaches at the intake manifold to make sure it is well connected and has no leaks. Have you recently heard a "hissing" sound when pressing the brake pedal? This would be a classic sign. I gave you a picture below of what the booster typically looks like but I didn't know the model of your vehicle so it may not be exact but basically the same. It's not a hard repair to do and if you are mechanical you may be able to do yourself. If you are a large person, getting up under the dash to loosen the attaching nuts as well as disconnecting the brake pedal assembly could be difficult as there isn't much room to work up there. Anyway, i hope this helps and good luck.


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Jun 02, 2011 | Oldsmobile Toronado Cars & Trucks

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1999 GMC Yukon, Do I need to replace the stop light switch if my brake lights only come on when I push the pedal real hard to the floor. I have already replaced the brakes and did a new brake booster. Is...


Sounds like you are on the right road with the switch. Before I bought a new switch I would locate the switch, it will come in direct contact with the brake pedal arm, and see if there is an adjustment or if it has moved for some odd reason. Sometimes things just happen.

Jan 28, 2011 | 1999 GMC Yukon

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

When i step on the brake pedal i hear air coming


This perfectly describes a failure of the brake vacuum booster.
Replace the power brake vacuum booster.

Jul 20, 2009 | 1994 Chevrolet C1500

2 Answers

Power brakes not working


No such thing as vacuum lines to the master cylinder. You do have a vacuum line on the brake booster (power assist). When you step on the pedal do you hear a whoosing sound down by your pedal. This is a leaking Booster. Needs replacement.

When you step on the brake does the engine rpm change. This is a leaking check valve (one way air valve).

Jul 17, 2009 | 1996 GMC Sonoma

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