Question about 1999 Daewoo Lanos

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Leaking brake lines from master cylinder - 1999 Daewoo Lanos

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  • brainvib Sep 12, 2009

    the leak is in the line between the master cylinder and the break hose. The leak is in the line from the master cylinder to where the break hose connects.

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  • 66 Answers

First make sure the threads on the flare fittings are in good shape... I've saved a few with a thread file... if the threads going into the master are messed up, My advice would be a new or remanufactured one. start the fittings before you tightem the master to the booster... much easier to get them started... don't force 'em or you be back to where you started

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

  • 232 Answers

SOURCE: Spongy brakes after bleeding them 2 times. Should I try to bleed the master cylinder or replace it?

Honestly your guess is as good as mine. But I don't think the master cylinder is NOT bad you still have air in the system. Get a big bottle of brake fluid bleed all four sides until you run out of fluid or your brakes work properly. You should divide the bottle's content in four, then use each quantity in each side. You'll be removing air and contaminated fluid from the system. Get a small hose that fits on the bleeders and an appropriate container. I have a good feeling if you do this your brakes will work just fine. I don't know how you are bleeding the brakes. I'll let you know the proper way just in case. This is a two man job, with the wheel off, have someone start the car. Have them pump the brakes a few times to get pressure. 1With the brake pedal UP open the bleeder, 2then have your assistant press the brake pedal all the way down and leave it completely pressed down. 3Close the bleeder valve, once close and only with the valve closed have'm release the brake. Repeat as necessary, bake depressed, open valve first then press brake. DO NOT depress until valve completly closed. Close valve THEN depress. Good Luck!

Posted on May 15, 2009

  • 1 Answer

SOURCE: 2003 town and country brake problem

Did your mechanic use a DRB III or equivalent scanner before performing the bleeding procedure after installing the master cylinder? This is a requirement by the manufacturer (Chrysler) when bleeding the brake system.

Posted on May 15, 2009

mikesagenius
  • 24 Answers

SOURCE: no brake pressure

There IS one place it can still leak. behind the brake master cyl - into (inside) the power brake vaccum booster, although that doesn't seem the problem. You first need to make sure your master cyl is bench bled. with a hose bleeder kit, you can bench bleed in-car. you should be able to bleed sys through abs sys with no problem. Sounds like the master cyl needs to be re-bled.

Posted on Jun 03, 2009

emissionwiz
  • 75117 Answers

SOURCE: brake pedal dropping to floor

do u have the antilock brake bleeding tool? if not you will need to have the dealer bleed the brakes, the ABS control valve must be electricaly held open to bleed the brakes there of course is a special tool for this.

Posted on Oct 18, 2009

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SOURCE: soft brake pedal after replacing shoes,drums,wheel

YOU STILL HAVE AIR IN BRAKE SYSTEM REBLEED BRAKE SYSTEM.

Posted on Nov 15, 2009

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3 Answers

Okay,the break peddle go all the way down. No presser in the breaks


Check the brake fluid level in the Master Cylinder. If it is good, then the most likely problem is a failed master cylinder. If the fluid is low or there is no fluid, you will need to track down and fix the source of the leak, bleed the brake system of air, and retest.

Mar 28, 2015 | Cars & Trucks

1 Answer

Do you have to remove brake lines when you change the brake booster


Check rear of Master Cylinder--If wet likely Master Cylinder Leaking and Booster Damaged. They Should be replaced as a mated pair. (for warranty) and brake lines removed and system bled.

Oct 16, 2014 | 1988 Ford F 150

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Brake pedal go all the way to the floor


Check for brake leaks. Make sure that the resevore is full. With the engine off pump the brakes then check for leaks. If there is no leaks then bleed the brakes start with the right rear and work clock wise around the truck. If there is no air that comes out of the lines and the fluid looks clean your master cylinder went bad and it is a easy replacement. To replace the master cylinder you'll need a 14 mm for the lines and a 15 mm for the booster. Thanks!

Mar 07, 2011 | 1997 GMC Sierra

4 Answers

Brake pedal to floor have replaced brake pads and master cylinder


Did the pedal go to the floor beforehand? Was the master cylinder leaking, and did you bleed it properly? If the master cylinder was not leaking, check your brake lines going to the rear wheels.

Jan 29, 2011 | 2000 Chevrolet Blazer

1 Answer

Clutch pedal drops to the floor with no real effort. How do I check the master cylinder?


CLUTCH AND MASTER CYLINDER SHARE THE SAME RESERVOIR YOU CHECK LEVEL IN THE MASTER CYLINDER.ADD BRAKE FLUID TO THE MAX LINE DONT OVER FILL.IF MASTER CYLINDER RESERVOIR IS EMPTY.CHECK FOR FLUID LEAKS AT CLUTCH LINES AND CONNECTIONS AT CLUTCH RELEASE CYLINDER AND CHECK BRAKE LINES - CALIPERS - WHEEL CYLINDERS AND BRAKE BOOSTER.FIX LEAKS AND BLEED BRAKE AND CLUTCH SYSTEM.

Jul 25, 2010 | Cars & Trucks

3 Answers

I have a slow brake fluid loss. I think it may from the master cylinder. Are there any seals in the lines that go into the master cylinder unit.


no they are inverted flare fittings no seals check all lines and calipers/wheel cylinders if all are dry remove the vacuum hose from the booster if there is brake fluid in the hose the master cylinder is bad

Sep 24, 2009 | 2002 Hyundai Santa Fe

1 Answer

Hello. i have a 1991 audi 100. brake padel has become mushy but there are no signs of brake fluid leak on the master cylinder or the lines. the brake pads are new. thanks


Just because there isn't an external leak in the brake system doesn't mean there isn't an internal leak in the master cylinder. A mushy pedal is usually an internal leak in the master cylinder or leaking wheel cylinders in the rear brake drums. Check the rear brake wheel cylinders for fluid leaks, if there are none or you do not have rear drum brakes, your best bet is the master cylinder :)

Sep 03, 2009 | Audi 80 Cars & Trucks

2 Answers

My 1994 buick lesabre's brakes will not work. I have low brake fluid and the brake pads were just replaced. My friend said that there was brake fluid leaking from the car and that I might need a master...


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

Mar 18, 2009 | 1993 Buick LeSabre

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