Question about 1995 GMC Yukon

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When pushing on the brake peddle with car moving the peddle is very hard and there is a hissing sound and in the meantime you to pumped it very hard for the car to stop .so when stop i open the resavour push the brakes again and notice the fluid shoot out would please help

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When I hold down my brake pedal on my au xr6 ford I hear a hissing sound and when I pump my pedal up with the ignition off then start the car my pedal doesn't move the pedal is very hard when I do eme


Sounds like you have a defective vacuum assist brake booster... Make sure you have a good vacuum supply with the engine running before condemning booster. If vacuum supply is between 17-20" of vacuum at idle and it is properly concreted to booster then the booster is defective

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Brake peddle should be hard, if bake peddle soft check master cylinder or replce, try bleeding brake system too. Ceck if check valve is bad this is located on vacumm line from intake manafold to booter pump body. brake seal at check valve booster pump should hiss if not check vaccumm line for leaks if no leak in line replace check valve they don't cost much.

Oct 04, 2013 | Buick LeSabre Cars & Trucks

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I get a hissing sound by my brake peddle when I apply my brakes and it does not go away. When I run the engine and depress the brake peddle and hold it there and turn the engine off the brake peddle...


Your bake booster has failed causing a massive vaccume leak when you apply the brakes. That in turn gives more air to the system so the computer tells it to add more fuel thus causing the rpms to go up. Replace it %99.5 chance that will fix it.

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MERCEDES BENZ 2003 MODLE E320,HOW TO BLEED BRAKES


remove brake fluid filler cap start at the wheel closest to cervo then move away so front to back remove road wheel there is a brake nipple on the caliper put a piece of tubing around nipple and into a jar with clean brake fluid in it loosen nipple get some one to pump brake peddle about 10 times on the final stroke keep peddle pushed to floor then tighten nipple up pump brake peddle a few time should be hard then repeat all wheels rear should only have 1 nipple for rear wheels but check this any way

Jul 02, 2011 | 2005 Mercedes-Benz Mercedes Benz E320 Cdi

1 Answer

The brakes are making a hissing sound when I push the peddle and it seems to take more force than normal to get the truck to come to a stop


u have a bad brake vacuum booster .mounts on ur firewall and behind brake master cylinder . good luck hope this helps

May 10, 2011 | 1995 GMC Sierra C1500

1 Answer

Red brake light stays on


Many cars have a switch that rests on the arm for the brake peddle that self adjusts. If something gets stuck between the switch and the peddle it can adjust the switch too far way from the peddle arm. When the object that got in the way falls out or is removed the switch will no longer contact the peddle arm and the brake lights will stay on. You would probably need to remove the panel cover for the bottom of the dashboard to access the brake peddle are and brake light switch. Once you see the switch depress the peddle with your hand and push the switch toward the peddle are. It shouldn't be too hard to push back into place and will probably make a series of clicks as it moves. Once the switch has been pushed in release the brake peddle and the switch will adjust itself back to where it should be.

Mar 31, 2011 | 2006 Chrysler 300

1 Answer

When push brakes you have to push really hard to make them go in then the truck barely stops. Replaced the MC and bled the brakes now every time push brakes truck acts like its going to die. Brake light...


Sounds like you will have to bleed your brakes again, but thats not the problem og hard brake peddle, need to check your power brake booster, sit right in back of master cylinder, check make sure it has vacum going to it, also to test it with engine off, press on brake peddle three time, then state engine with foot on peddle, peddle should go down a few inches, also with engine of peddle should feel soft for three pumps, if you have none of this , power brake booster is bad.

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94 s10 chevy 2wd brake pedal fades to floor before stoping


Might check around the big black round muffin shaped chamber adjacent to the master cylinder for a loose vacuum hose or crack therin; the hissing sound seems likely to be the air rushing in as you loose the vacuum that supplies the power to assist your braking effort (power brakes)---as this goes, so goes your peddle until it reaches the actual piston pushing the brake fluid (which should be firm like with non-power brakes).
...maybe have an assistant push on the peddle while you listen with a piece of hose or a stethescope to find the leak (or I suppose the power unit diaphragm could be shot/leaking--hence replacement), but since you said after bumpy road etc, one could hope for a simple dislodged vacuum hose or fixable crack.

Aug 08, 2009 | 1994 Chevrolet S-10

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