Question about 1986 Volkswagen Cabriolet

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When the car is off and i have my foot on the brake, it is firm. when i start the car, the brake goes to the floor. Vacuum leak? where?

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I don't think it's a vacuum leak. You might have a brake fluid leak, a sticking or stuck caliper or wheel cylinder, or the master cylinder could be bad.

Posted on Nov 10, 2010

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2 Answers

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.

Feb 17, 2017 | GMC Cars & Trucks

3 Answers

Are there vacuum hose on the brakes hydraulic system?


NO. the vacuum is used to make the brake pedal easy to push, power brakes. the pedal would be hard without vacuum, that is why the pedal gets hard with the key off and engine not running. the problem you are having is more of a hydraulic problem.
Have the brakes checked asap. the brake system may have a leak causing the pedal to go low. check the fluid level and if it is low or empty then there is a problem, could be a rotted brake line leaking or a wheel cylinder leaking.

Dec 07, 2012 | 1997 Ford Probe

1 Answer

1999 dodge durango soft brake pedal only wen i start it


have someone have there foot on the brake & start vehicle, inspect the flexible brakelines to see if any are balooning out. You could also clamp off one flexible line at a time & press brake & when you find the brake at fault the pedal will go hard.

Oct 12, 2012 | 1999 Dodge Durango

1 Answer

BRAKES BLED PEDAL GOES TO FLOOR WHEN STARTED


if a master cylinder is bad and you are sure you have all the air out and no leaks.pedal will go to floor , running or not. if booster is bad it will cause a hard pedal. but if master cylinder is bad it will turn on a brake light on dash if it works. make sure the wheel cylinders are not leaking. I beleive that the master cylinder is bad, or you have a leak somewhere. If the master cylinder is functioning properly, the brake pedal will depress to a certain depth and no further.

Apr 20, 2012 | 2000 Chevrolet Blazer

1 Answer

My brake pedal goes all the way to the floor


Brake pedal goes to the floor? When does it happen. That is the most important piece of information. Most brake systems are power assisted via vacuum from the engine. Your brake booster is what makes the "power assist" work. There are some specific times when you will feel your brake pedal "fade" to the floor and it is normal due to the cycle of the brake components operation.If your brake pedal goes to the floor every time you step on it, stop driving and get to a repair facility! If the pedal is working when driving and the vehicle seems to be working as it always has, then chances are there is no concern. To be on the safe side, have it checked the next time you are in for any other type of service.There is a sensor inside most brake reservoirs that activates the indicator light in your instrument cluster when the level is lower than it should be. As your brake pads wear down, the system requires more fluid so the level at the reservoir drops setting the light. Same thing if there is a leak. The fluid level drops and the light goes on. This brake fluid leak would most likely be combined with a spongy pedal or a pedal fade every time you step on the brakes. A leak would also almost always have a wet area around the leak. Sometimes the leak can be internal to a part of the car you cannot see, so don't count on it.One easy way to check most brake boosters and the brake system for leaks is to turn the vehicle off and pump the brake pedal. Every time you depress the pedal you should feel the pedal "height" come up and the pedal get harder. After a few firm pumps of the pedal, hold it down. Leave pressure on the pedal for 20 seconds or so. Does the pedal move slowly (or quickly) to the floor? If so then there is a leak somewhere in the system. Keeping pressure on the brake pedal, start the vehicle. Does the pedal no drop? It should. That is the power assisted vacuum kicking in as the engine starts to run.The bottom line is that we are talking about your brakes. Your life, your passengers lives and the lives of others on the road around you depends on that system working properly. If you have any doubts, or feel uncomfortable, take it in to have it looked at. Know specifically what it is doing so that you can have your repair facility look at what you are feeling and tell you if

Oct 29, 2011 | 1987 Nissan Pickup

1 Answer

I have a 2005 scion xb, I have replaced brake pads and master cylinder, I've bled and bled the brakes, but foot petal still goes to floor, have nothing leaking either, help


Hello and welcome to FixYa!

When you open be bleed valve, does the fluid flow solid when brakes are applied? If yes then the problem will be on the hydrovac. You can have a vacuum leak that's why the brake pedal stays on the floor. If the fluid is not solid then you'll need to bleed it out some more. You may need to replace the hydrovac to get your brakes working normally again.

Hope this helps and thank you for using FixYa! Have a good one!

Apr 23, 2011 | 2005 Scion xB

1 Answer

Replaced rear breaks, 2007 spectra, breal pedel is solf, goes to the floor. how do I firm up break pedel, never broke any lines.


You have to check that rear brake cylinders doe's not leak fluid. Check your master fluid reservoir when you pump the brakes.
You have to bleed air from the system, and check the vacuum hose at the master brake cylinder.

Feb 21, 2010 | Kia Spectra Cars & Trucks

1 Answer

No power brakes '


your brake booster went out, or you have a major vacuum leak, provided the pedal is still firm when you press it. It'll usually feel like stepping on a rock, but the brakes will still work to a small degree. The booster is more likely. If the pedal goes to the floor, you have air in the system, a blown brake hose, wheel cylinder, or caliper.

Nov 19, 2009 | 1997 Ford Taurus

2 Answers

With motor running, brake pedal goes to floor and swoosh of air is heard


Could be brake booster leaking. When engine is off the brake pedal should be firm and not go to the floor. If the pedal goes to the floor engine off, there may be a master cylinder problem also.

Oct 28, 2009 | 2005 GMC Envoy Xl

1 Answer

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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