Question about 1994 Buick LeSabre

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Bwhy does the brake fluid sink when i add more to the master cylinder

I put more fluid in it stays then when I pump the brakes it sinks why?

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  • Master
  • 2,069 Answers

You have a leak in a brake line

Posted on Jan 10, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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muttandjeff
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SOURCE: Brake problems

still got air bleed more

Posted on Nov 27, 2008

motor1258
  • 6674 Answers

SOURCE: back brake lines wont bleed on 77 chevy truck

Check out this link & read about combination valve & how to center it when bleeding.

http://www.autozone.com/addVehicleId,1321403/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c1528007a632

Posted on Jan 23, 2009

  • 2 Answers

SOURCE: 1997 Buick Skylark No BRAKES

Try bleeding the master cylinder after it has been installed, the same way you bleed lines. Just crack the lines a smidge. And I mean a tiny smidge. It worked on my 97 protege.

Posted on Feb 27, 2009

  • 92 Answers

SOURCE: My 1994 buick lesabre's brakes will not work. I

if you can see a good amount of wet brake fluid between the brake master cylinder and the brake booster. and you have been adding fliud often,you could have a bad master cylinder. it has to be replaced not rebuilt. you however may have a far more common problem, a rusted through brake line.have someone pump the brake pedal, than look under the car for a brake fluid leak ,repair as needed. than bleed the brakes for a good hard brake pedal
good luck chris

Posted on Mar 18, 2009

matney68
  • 426 Answers

SOURCE: ABS & Brake warning lights turn on

it is possible but its also possible you have a wheel speed sensor acting up. you would have to have it scanned for codes

Posted on Jul 30, 2009

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1 Answer

`How do I determine if the brake master cylinder is failing ? No fluid leaks brakes do not pump up when bleeding system,recently brake pedal stayed down to floor, pulled back up with my foot.


If there are no external brake fluid leaks, continued application of pressure on the brake pedal will see the pedal sink to the floor if the MC is faulty and needs to be replaced. This will be due to significant wear inside the MC in the bore and on the pistons.

Dec 11, 2015 | 2000 Cadillac DeVille

1 Answer

Bleeding brakes on my 1993 Cadillac Eldorado


This takes 2 people master cylinder is full lid back on . have assistant pump brake pedal 3 times then hold down saying "holding" then you loosen bleeder screw on right rear brake slowly air will come out then a little fluid. tighten screw and say pump it up "holding" as fluid in coming out pedal will sink "Keep pressing" repeat util clean fluid appears. check master fluid level now repeat left rear. fluid level right front fluid level left front fluid level once complte you should have a firm pedal.

May 03, 2014 | Cars & Trucks

1 Answer

Brake problem


Usually if the booster fails, the pedal is very hard to push enough to make the vehicle stop.
If the pedal sinks or is soft, the master cylinder is allowing fluid to bypass the pistons inside.

Feb 22, 2013 | 2007 Kia Sedona LX Minivan

3 Answers

Brake pedal sinks to floor


Losing fluid somewhere or losing pressure in the master. Will need to be serviced by a shop. Can't drive it this way.

Sep 10, 2012 | 2005 Mazda 3 Sedan

1 Answer

Red light in the dashboard, warning sign brakes? pressing the brake peddle is resulting in soft sinking downwards. pumping movement is not changing it.


These symptoms are usually an indication of a leak in the brake hydraulic system which allows air into the system. If you've had to add brake fluid to the reservoir recently this is a likely confirmation of a leak. The most likely source of the leak is the Master Cylinder, the piston seals wear out allowing fluid to leak out and air to enter. Look for evidence of brake fluid running down from where the Master Cylinder attaches to the vacuum booster, if there is a leak here the Master Cylinder needs to be replaced.

Jan 30, 2011 | 1996 Pontiac Trans Sport

3 Answers

1996 Suburban. Does the brake pedal gradually go all the way to the floor if the problem was worn brake pads ????


no worn pads do not cause a sinking pedal, you have a defective brake master cylinder, the seals inside the master cylinder are leaking

Sep 22, 2010 | 1996 Chevrolet Suburban

1 Answer

Red brake light flashing periodically - ??


Often this is because the brake fluid level is low. There is a sensor in the brake fluid reservoir that turns on the dash warning light when it does not sense enough fluid. You can visually check the brake fluid reservoir by looking at the reservoir under the hood. There are marks on the reservoir to show the correct level. If the fluid is low, this means that one of your brake system components is leaking fluid and needs to be replaced or repaired. If the fluid level is ok, possibly there could be air bubbles in the system, and it needs to be bled. If bleeding does not solve the problem, it could mean that the master cylinder is not holding pressure. If the brake pedal is spongy but it becomes firm after a few pumps, usually this means air in the system. If it stays spongy after pumping, and sinks continually when you press it, probably the master cylinder needs to be checked.

Mar 15, 2010 | Volkswagen New Beetle Cars & Trucks

1 Answer

Brake pedal is sometimes sinking to floor. Brake


most likely your master cylinder is acting up try to press hard on your break for a period of time and see if the pedal will sink/replace master

Jan 13, 2010 | 1993 Toyota Pickup

3 Answers

Brake pedal sinks 1-2 inches while holding


Sounds like your master cylinder is shot. Go to a parking lot, stop, and pump the pedal a bunch of times. Then get out and see if there is any fluid leaks by any of the wheels. That would indicate a brake line leak. My first guess, however, is your master cylinder.

Jun 02, 2009 | 1985 Toyota Pickup

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