Question about 1998 Chevrolet Cavalier

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I HAVE A LEAK UNDER THE CAR, ITS NOT BY THE WHEEL BUT THE FLUID IS DOWN IN THE MASTER CYLINDER. Any ideas?

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Best advice here that i can give is to ask a local mechanic to have a look and advise as with a visual inspection i honestly couldnt tell you and if the truth is known i dont think any one can unless maybe they work on this model vehicle all day long

Posted on Mar 15, 2011

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1 Answer

Brake fluid leaking


Look at the insides of the wheels from under the car and look for a wet wheel. Check around the rear of the brake master cylinder for signs of leakage. Sometimes the fluid will leak from the brake master cylinder into the brake vacuum booster. You would need to remove the master and check for fluid in the booster.

Dec 19, 2013 | Chevrolet Express Cars & Trucks

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Losing brake fluid with no leak


It's a sealed system, so it's got to be going somewhere, leaking somewhere (or boiling off from severe braking operations over and over). Since you likely haven't experienced extreme braking, it must be leaking somewhere.
You will have to trace all your brake lines from the master cylinder to each wheel to check for any sign of leaking. Front calipers are easy to spot leaks when they leak. If you have drum brakes on the rear, you may need to pull off the drum to check the wheel brake cylinders. Peel back the rubber boot on each end of the wheel cylinder and look for any fluid leaks there.
Another place to check is at the back of the master cylinder. If a seal is bad there, it has been known to leak fluid inside the car, under the dash. Feel around the carpet under and behind the brake pedal for any wetness. If you find brake fluid there, you will need the master cylinder replaced or rebuilt.
Hope you find the problem. Don't forget to check the ABS system and brake lines, too.

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I bleed brakes i get good brake for a day or two then they go out again what can i do


air must be entering the system somewhere, check all wheel cylnders for leaks, and check the master cylnder for leaks( some cars's master cylnders leak at the firewall and fluid runs down inside the car under the carpet)

Jul 12, 2011 | 1992 Buick LeSabre

1 Answer

Brakes suddenly went without any warning so probably not pads. Ideas?


if you havent lost fluid then its a master cylinder ,if you have lost fluid then look under car at back brakes to see if their is fluid running down the inside of the wheel

Mar 05, 2011 | 1996 Toyota Corolla

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Why my 1998 brake is down to the floor soft and spongy


It sounds like you have a leak in your brake system. If you climb under the car and look at back sides of each tire and look for an oily film on one or more of tires.That'll indicate that wheel is problem source. Could be wheel cylinder, caliper, brake hose. If you open hood and inspect fluid level in your brake master cylinder, I'm sure you'll find it low or empty.

Feb 26, 2011 | 1998 Mercury Sable

1 Answer

My brake pedal is on the floor and the brake fluid continuously goes low. It seems like the vacuum pressure never builds to keep the pedal off of the floor. Any ideas?


You will need to carefully inspect the entire brake system for leaks. Inspect the front calipers, rear wheel cylinders, all the hoses, the back of the master cylinder, and steel lines. If something looks wet or drips brake fluid it is leaking. If you haven't seen any brake fluid dripping from under the car my first thought is that the rear wheel cylinders are leaking.

If the pedal went to the floor and you didn't have to add fluid than you would more than likely have a bad master cylinder but since you are adding fluid there is a leak somewhere.

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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.

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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.

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2 Answers

Have to fill resivor every two weeks no fluid on ground or at wheel cyl


do you notice any fluid by your feet in the car? if yoiu are mechanically inclined at all, pull the master cylinder away from the vacuum booster just enough to see past with a flash light or fluid pours out. if this does happen, you will need to replace your master cylinder and bleed the system.

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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

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