With the engine running, the brake pedal fails possible causes and their elimination

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2018-03-18 20:16:34

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Perhaps the most important system in any car – the brakes. The impossibility of timely stops leading to a fatal consequence. It is therefore important to monitor the status of all nodes in the system. And if with the engine running, the brake pedal fails, it is a sign for unscheduled diagnostics. Why is this happening and how to fix the problem? We'll talk about this in our today's article.

Check

If the pedal began to fail, inspect the brake fluid reservoir. brake fluid reservoirMost Often this error is occurring due to insufficient fluid level in the system. On the reservoir there is a corresponding mark. It is desirable that the level was not below average. Otherwise you have to refill it.

What happens?

Not always with the engine running, the brake pedal fails due to a torn cuff or tubes (more about that later). Possible natural care liquid. How does it happen? Over time, the pads (especially on the front axle) wear out. The pistons on the caliper you want to make more of an effort to press the pads to the disk. Accordingly, it needs more fluid.

Do Not mix different classes

It would Seem that a little liquid left, and in order to fix the problem, simply refill it to the need level. However, it is not so simple. Different cars use different classes of brake fluid. Most common DOT-3 and DOT-4. They all have different properties and, importantly, the temperature of boiling. If you refill the brake fluid reservoir not the class, it will have a detrimental effect on the operation of the entire system. Also, this mixture will corrode the seal and other elements. It is therefore important to clarify what was previously used brake fluid in the car. Domestic brands GAZ and VAZ factory is used Rosdot fourth grade.

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Booster

Almost all cars, except commercial vehicles, used hydraulic brake system. Its design implies not only the main and the working cylinder and vacuum booster. The item is durable enough. with the engine running, the brake pedal failedBut in case of untimely replacement fluids vacuum booster may falter. So, goes down to the diaphragm. The symptoms may be different. When you press on the brake pedal the car doesn't reduce normal speed. The stock fails. Why does this happen? Vacuum booster works from vacuum. If the pressure inside will be at atmospheric (that is due to a torn diaphragm), the body does not create the right stress. Engine running, brake pedal falls, and the rate of motion remains the same. To drive with this fault is extremely dangerous. The solution to the problem – replacement of the amplifier or buy the kit and replace the broken parts.

Air

This is another problem, because of which there are interruptions in the operation of the mechanisms. Airing the brake system is dangerous because the fluid can boil. As a result, to reduce the speed of the vehicle would be altogether impossible, unless the handbrake. What is the reason? Air can get into the system with the tightness of the highways. Typically, in brake systems use metal pipes (copper or aluminum). However, on the front calipers they need to ensure mobility. In view of this, the design uses and of rubber tubing. They have a double layer. If the tube is damaged, you have time to notice the fault. However, ignoring the problem will begin to peretiraetsya and the core layer. As a result, fluid will flow, but instead from the atmosphere sucked air. Always look for puddles under the car after Parking. Perhaps at this point damaged one of the tubes. If engine running, the brake pedal fails due to the presence of air in the system how to solve the problem? airing the brake systemYou Need to completely remove air from the system. Ideally replace the fluid entirely. What volume do we need? The VAZ used 0,66 liters of liquid.

Tools for pumping

Consider the process of pumping on the example of Volga car production. So for this we will need:

  • Transparent silicone tube (its diameter should be identical to the fitting on the caliper or drum).
  • The Keys at 8 and 10.
  • Balonnikom.
  • Jack, protivorakety.
  • Capacity to drain the old fluid. Fit an empty bottle of mineral water.

By the Way, in recent times shops began to appear special keys for loosening brake fittings. What they are useful? Unlike Rozhkovo-ring tool, they use more faces. But the fitting tends to turn sour (it is in a very dirty place). Therefore, there is a risk of ‘to lick" face of the bolt.

Start work

The Pumping is performed in sequence. The scheme – crosswise. First, the air is pumped out of the right rear wheel. Then – from front left. Next, move to the rear left and then front right disk. So, pick up the bolts from the right wheel, put the car on the Jack and set the stops. To raise the sandwiched pads can not. Next, open the hood and add the fluid to the maximum. We need an assistant who on the team will be pushing on the pedal a few times. when you press on the brake pedalIn the end you want to keep the brake in the floor. At this time you open the bleeder valve and watch for the pre-installed hose will leak fluid. First, it will be filled with air. Subsequent attempts (the procedure should be repeated several times) it will take the consistency of the liquid. The number of repetitions depends on the volume of air that was in the system. To stop the procedure is when with hoses no flow of clean fluid with no bubbles.
vacuum boosterNext, remove the silicone tube and tighten the fitting. Proceed to the next wheel. And so as long as the air is not removed from all circuits. Important point – periodically during pumping check the fluid level in the tank (it will slowly but surely fall). We can not allow that he was at a minimum. Otherwise the system “SIP” the air and the procedure must be repeated at all four wheels.

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Article in other languages:

AR: https://www.tostpost.com/ar/cars/1249-with-the-engine-running-the-brake-pedal-fails-possible-causes-and-thei.html

BE: https://www.tostpost.com/be/a-tamab-l/2137-pry-yak-pracue-ruhav-ku-pedal-tormazu-praval-vaecca-magchymyya-prychyn.html

DE: https://www.tostpost.com/de/autos/2135-bei-laufendem-motor-das-bremspedal-f-llt-m-gliche-ursachen-und-deren-b.html

ES: https://www.tostpost.com/es/coches/2140-cuando-el-motor-est-funcionando-el-pedal-de-freno-se-hunde-posibles-ca.html

HI: https://www.tostpost.com/hi/cars/1249-with-the-engine-running-the-brake-pedal-fails-possible-causes-and-thei.html

JA: https://www.tostpost.com/ja/cars/1248-with-the-engine-running-the-brake-pedal-fails-possible-causes-and-thei.html

KK: https://www.tostpost.com/kk/avtomobil-der/2138-oz-alt-ysh-zh-mys-step-t-r-an-kezde-tezheg-sh-bas-yshy-provalivaetsya-.html

PL: https://www.tostpost.com/pl/samochody/2141-przy-pracuj-cym-silniku-peda-hamulca-zapada-mo-liwe-przyczyny-i-ich-us.html

PT: https://www.tostpost.com/pt/carros/2138-com-o-motor-funcionando-o-pedal-do-freio-falha-poss-veis-causas-e-corr.html

TR: https://www.tostpost.com/tr/arabalar/2143-motor-al-rken-fren-pedal-d-yor-olas-nedenleri-ve-bunlar-n-giderilmesi.html

UK: https://www.tostpost.com/uk/avtomob-l/2140-pri-pracyuyuchomu-dvigun-pedal-provalyu-t-sya-mozhliv-prichini-h-usune.html






Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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