Question about Hyundai Motor 2002 Sonata

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Braking problems when i presson the brake pedal i dont feel the compression that i normally do. as a result i have to press very hard to stop the car.

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Gary;

The first thing you should check is the brake fluid level in the master cylinder. In case you are not familiar with this item it is located in the engine compartment right in front of were thr driver sits. It is usually high up and has a cap that is held on by a spring clip. Push the spring clip off to the side and lift the cover off.you will be bale to see the brake fluid level. It should be close to the top of the chamber. if if
appears low, add some brake fluid to bring it close to the top. You can get brake fluid in an 8oz can at any auto parts store. Tip: Always keep the brake fluid can tightly sealed after use. It has a tendency to absorb moisture out of the atmosphere, which can freeze in the winter.

Adding some brake fluid ( if necessary) should help the pedal problem. However..... We must find out where the missing brake fluid is going. The brake fluid system is a closed system,ie, you do not
normally have to top off the master cylinder. What this means is you have a leak somewhere in the system. Best places to look is 1.) the master cylinder. Look for signs of leakage. 2. Each of the 4 wheels. There is a braking piston on each wheel. Look for signs of fluid on the inside of each wheel.

There is one other possible cause of no brake pedal and that would be a faulty master cylinder. If you press the brake pedal and hold the pressure you shsould reach aa point where the pedal will not go down anymore. if it gradually keeps going down, I would suspect a faulty master cylinder.

Hope this helps Good luck

Loringh

Posted on Oct 16, 2008

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Hi there,

In a properly functioning brake system, depression of the brake fluid forces fluid through the brake lines to the brakes, which then of course stop the vehicle. Brake fluid is special in that it does NOT compress, which is why pressing of the brake pedal should feel solid.

However, air on the other hand, DOES compress and if air is present in either the fluid or anywhere in the brake line, this will cause the brake pedal to feel spongy.

Brake fluid has a lifespan of approx. 2years - old fluid should be completely flushed from the brake lines, by forcing NEW fluid through the system. Never mix old fluid with new, as this will introduce contaminants and also air into the new fluid.

Note: there are around 3 types of brake fluid currently available - you MUST use only that which is approved by the vehicle's manufacturer.

On many cars, bleeding of brakes must be done in a specific sequence as per manufacturer's instructions, due to complicated fluid proportioning valves etc.

I recommend you have the quality of fluid + bleeding process rechecked.

If both check out ok, then you may have a more serious problem of a leak somewhere, allowing air to enter the brake system.

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"If this has helped you in any way, please rate this solution" :-)


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