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Brake line from master cylinder rusted out? - 1995 Buick LeSabre

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All steel and flex Brake lines can be replaced.Then the brakes bled of the air and test driven!

Posted on Sep 07, 2010

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Soft brakes


You have a leak in the brake system, need to check the medal brake lines that run through the frame rail and goes to the back wheels, It is common for those to rust into towards the back. If lines are okay then check the wheel cylinders. If you are not low on brake fluid then you probley have a bad master cylinder.

Apr 21, 2012 | 2000 Isuzu Rodeo

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After bleeding the brakes on my 84 mustang I noticed that one of the bleeder screws was not tight and fluid spilled out on the driveway. I tightened the screw and re-bleed the brakes but, the peddle goes...


Yes and No...Replacing the master cylinder is a good idea, however, giving the vehicle that much pressure with old lines attached may blow out the old rusted lines. If you are going to replace the master cylinder, you may just want to replace the brake lines as well.

Aug 29, 2011 | Ford Mustang Cars & Trucks

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Rusted rear left brake line replaced, fluid drained from master cylinder. Left the line open while I picked up the new line. Bled all four brakes, but the peddle goes to the floor (slowly) with medium...


Did you remember to bleed the master cylinder itself? When the master cylinder runs dry you should start bleeding your brake system at the master cylinder and then continue on to each of the four wheel cylinders.

Dec 15, 2010 | 1997 Oldsmobile Aurora

1 Answer

Replacing brake fluid


Brake fluid absorbs moisture, and this can rust the insides of the brake system. The moisture was not that big of deal 10 years ago, but on ABS brake systems of today, the rust and other debris that accumulates in the fluid can do lots of internal damage, and can be very costly. Brake fluid can also break down over time from excess heat that is created from within the brake system.
It is recommend flushing the brake fluid system about every 30,000 miles, or at 30K, 60K and 90k tune up. It cost about $90, but you can do it by yourself. To do this flush, open the brake lines located at each wheel and allow the brake fluid from the brake master cylinder to "bleed by gravity", as continue to feed new fluid to the master cylinder until the fluid runs clear at all wheels.You need two people do do this job. One at master cylinder brake fluid bottle under hood, adding fluid, and the other one under the car tightening up the bleeding nipples as necessary, until the discharge clears up. The discharge has to be collected in 16OZ plastic bottle via clear vinyl hoses from the bleeding nipple to the bottle. It is a good idea to replace all 4 nipples with new one. They are cheap and avoid problems in long run. Make sure to use at least DOT 4 brake fluid. Make sure to use a sealed bottle. The life of brake fluid in an open bottle is one week. If the brake pedal is spongy, then go for bleeding of the brake system, one wheel at a time. You must inspect all breaking system components, from master cylinder, up to calipers, or rear brake cylinder for any leak, or malfunction. check the status of brake lines for rust, and if necessary replace or undercoat them.

Oct 30, 2010 | 1992 Chevrolet C1500

2 Answers

1999 daewoo matiz has lost brakes fluid has leaked out. what is the most likely cause?


You must look for 'wet' areas under the car to determine where a brake line may be leaking fluid. This can be caused by corrosion (metal brake lines rusting away), or damage, if the car ran over some debris in the road. The front brakes have flexible rubber lines attached at the wheels, so the car can turn, and the lines 'flex' or move. The rubber can deteriorate over time, causing cracks that can leak fluid. So, you must be a detective and examine the underside of the car to determine where the leak is. If you can't find any evidence, the last thing to check is the master brake cylinder, mounted on the firewall. If the seals go bad, you should notice leakage, usually only visible inside the car, under the dash where the brake pedal meets the master cylinder.

Apr 18, 2010 | 1999 Daewoo Lanos

1 Answer

Oil missing out of master cylinder oil on rear line going to back brake


You have a raptured brake line. Mostly from rust. Everytime you apply pressure to the brake pedal that is why its taking brake fluid. Keep adding brake fluid to your master cylinder-don't let it go dry or you will lose all of your back brakes if you didn't already. You have to have your brake lines replaced and have your brakes bled. Should be about a $100 job at a good brake shop.

Oct 17, 2009 | 1997 Cadillac DeVille

2 Answers

Can break master cylinder (kit) do as good job as a new master cylinder?


This is a Yes, and No reply.

YES,
if the mechanic insures that the bore of the brake master cylinder, is free of rust pits, and if not, uses a brake hone to smooth out the bore. Closer inspection will reveal if the pits are too deep, and the master cylinder is unusable.

YES,
if the rubber components that go into the bore of the brake master cylinder, are installed in the correct direction, all the components are assembled in the correct order, and are pre-lubed with a little bit of clean brake fluid, before installing.

NO,
if any of the above criteria is not met.

The main thing is that the Brake Master Cylinder is in good repair. In good shape. If we are discussing the original brake master cylinder, for a 1981 Ford F100 pickup truck, we are discussing a master cylinder that is 28 years old, and has seen a lot of wear.

As a metallic object, such as a brake master cylinder heats up, (Engine heat, or even just the sun shining on the vehicle), then cools down, the moisture that is always present in the air, will form in the master cylinder.

Forms in droplets, at the bottom of the master cylinder's reservoir. This moisture creates rust, when it touches the cast iron brake master cylinder casting.
The rust clogs the ports at the bottom of the reservoir, and goes down into the bore of the master cylinder.

Makes rust pits in the bore, and harms other master cylinder components, then goes into the brake lines, and onto the rest of the brake system.

Me?
For the cost of a rebuilt or new brake master cylinder, compared to the expense of the master cylinder brake kit, and your labor time, I would go with a rebuilt, or new one.

Also this is part of the Brake System, and there's no fooling around with brakes! Your life and/or someone else, Depends on those brakes!

Oct 12, 2009 | 1981 Ford F 100

1 Answer

Can't get front brakes to work


fill master cylinder, slowly close of brake lines to be sure you have pressure from master cylinder, pump brakes to check master, check that calipers were seated in housing properly

Aug 08, 2009 | 1997 Volkswagen Golf

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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