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I hear vacuum leak when i hit the brake pedal at times the truck stauls when i hit the brake or put in reverse?

Problem at idle hear the vacuum leak from under the dash

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  • 373 Answers

Power booster is gone

Posted on Jan 08, 2013

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6ya6ya
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Posted on Jan 02, 2017

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tripletauto
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SOURCE: Air conditioner blows through defrost vents

LOOK AT THE WHITE PLASTIC HOSE GOING TO THE RECIRC VACUUM ACTUATOR UNDER HOOD. THIS IS ON TOP OF A/C BOX BY RIGHT SIDE OF FIRE WALL YOU WILL FIND THIS HOSE IS STARTING TO COME APART REPAIR HOSE AND PROBLEM FIXED.

Posted on Sep 13, 2008

  • 1 Answer

SOURCE: 1990 Toyota Celica GTS. Idle races too high

sound very much like a vacuum leak.... also maybe your timing is off? possibly advanced? try retarding it with the distributor if thats the case...

Posted on Feb 01, 2009

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SOURCE: 99 Jeep Grand Cherokee Brake light problem

You can adjust the switch by putting your thumbs on either side of the switch plunger and pushing toward the brake lever. The switch shaft will ratchet into the new position which is will then be depressed by the brake lever when it is the brake is not being depressed.

Posted on Jun 23, 2009

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SOURCE: 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.

Posted on Jul 20, 2009

  • 474 Answers

SOURCE: 95 F250 Diesel.Vacuum assist Brake Master Cylinder

you may have to bleed your abs sys. this is best done with a computer

Posted on Sep 12, 2009

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1 Answer

What are symptoms for bad brake booster on 1998 Dodge Ram 1500?


Hard brake pedal when applied with the engine running. A quick test for the vacuum assist booster is to shut off engine, pump brake pedal 3 or 4 times and hold on the last pump, start engine and see if pedal drops a bit....if you detect a problem with booster you should check for adequate engine vacuum supply to booster when idling . You can sometime hear a hissing or air leaking when applying brake pedal with engine running if booster is defective

Jul 15, 2014 | 2001 Dodge Ram Pickup 1500

1 Answer

Dodge ram dies reverse


You may have a vacuum leak, which is more apparent when you lean on the brake pedal hard. It won't be easy to find vacuum leak, but a can of WD40 sprayed around suspected areas could find leak when idle changes.

Jan 06, 2014 | Cars & Trucks

1 Answer

When applying brakes and when first start in morning truck will surge idol down. Idol is high at all times. What could this be?


Check condition and operation of idle control valve.
Also check condition of vacuum lines and brake vacuum assist hose and vacuum assist servo.

To check if you have a vacuum leak before the servo unit, first check hoses and connections, then pull off the vacuum hose to the servo unit and put your thumb on the end of it. You should feel a strong pull/vacuum. If you release your thumb then you should hear the engine revs climb, and then possibly go back to normal.
If you feel lack of vacuum, then you likely have a leak somewhere.

Another thing to check is that when you pump the brakes several times, the engine note changes and your brakes become stiff for a second or two before becoming softer again.
After you have run the engine for a few seconds and then turned it off you should be able to pump the brake pedal three times, with it being soft-ish each time until all vacuum has been spent from the servo unit, and then your brakes become stiff again. If this seems not to be the case, and they are still all the time, then you have a vacuum leak, possibly in the servo unit.

Nov 13, 2012 | Cars & Trucks

1 Answer

My 1993 mercury grand marquis has a vacuum leak between back of engine and firewall. the pvc has been changed, all plugs and plugs wires were changed. it idles very rough at stop lights and now after a...


it sounds like you may have 2 problems.
1st vacuum leaks are fairly easy to find if they change idle/accelleration,alot of times you can hear
it,the use of carberator cleaner spraying different vac hoses & gaskets while engine idles to see a difference in the way the engine idles(goes up/ down in rpm's)or using a unlit propane torch.if its a very tiny vac leak then a smoke test can be done.
your hunting to find rev/drive maybe a worn switch or linkage

Jul 16, 2011 | 1993 Mercury Grand Marquis

1 Answer

I hear air leaking when i press on brake pedal makes car idle funny i looked under steering column i feel air coming from what looks like a rubber piece looks like it going thru fire wall has little vent...


you need to change the brake booster the diaphram in side of it is bad it is letting the vacuum leak by that way the idle of the car changes it's like you have a vacuum leak
change your brake booster

Aug 18, 2010 | 1999 Chevrolet Suburban

2 Answers

I have a 1998 Freelander 3dr Tdi (L-series Diesel) It just started to idle high (just above 1000rpm) and sometimes it would shoot up to between 3000-4000 rpm when ingaging the clutch (when coming to a...


Check for a possible leaking vacuum system, maybe the vacuum booster is leaking, that would explain the idle being affected by stepping on the brake pedal.

Nov 01, 2017 | 2002 Land Rover Freelander

1 Answer

STARTS AND STAULS -WHEN I GO TO START THE CAR IT WILL START THEN STAUL . IT WONT CATCH


faulty idle speed control.fuel filter can be clogged.bad spark plugs and wires.intake gasket leak .vacuum leak at hoses.also scan it coolant temperature sensor and egr valve will cause stalling problems.

Jul 06, 2009 | 1999 Oldsmobile Alero

2 Answers

Vacuum leak at base of steering column the part is half moon shaped and white what is it called


Run the vehicle at idle and turn off engine. Step on the brakes with the engine off and listen for vacuum leak. If you hear hissing with the brake pedal depressed it's the Brake vacuum booster......In the same area there is a parking brake vacuum release switch which leaks only with the car is in idle. If this is leaking your automatic parking brake will not release your parking brake automatically in drive.

Apr 13, 2009 | 1989 Ford Crown Victoria

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