6 Reasons Your Car’s RPM Goes Up When Pressing Brake

RPM is a measure of how quickly your car is accelerating. But why does car RPM goes up when pressing brake? This is an odd thing to happen but has some simple explanations. Go through the article below to understand the problem

Driving a car requires a lot of technical knowledge, driving experience, and skills. With the advancements in-car tech, different models and systems have been arising in the vehicles, and although they are making your driving experience smoother and more comfortable, 

understanding and fully applying them can be harder compared to the older mechanism. We will be looking deeper into some of the common problems you can face while driving and answering questions like why RPM goes up when pressing brakes. RPM is one of the essential details you have to keep an eye on while driving the cars, so let’s get deeper into this matter without further delay.

RPM Goes Up When Pressing Brake

What Is RPM?

RPM stands for “Revolution per minute”, and when it comes to a car, it means how many times a piston goes up and down in your car or how many times the engine is spinning. 

The car’s RPM determines its speed, and the larger the RPM, the greater will be the speed of the vehicle. In the dial of your car, the RPM is printed in a single digit which you can later multiply by 1000 to get the actual RPM of your car. 

In some models, the speed is also given in km/hours, which is easier to read but having the RPM meter has its advantage too.

RPM also greatly influences the fuel consumption in your car. On a higher amount of RPM, the power output is higher but with it, the fuel consumption increases due to the higher working of the engine.

How is RPM affected?

You may notice the increase or decrease in the RPM of your car when you accelerate or decelerate, respectively. When accelerating, the car engine exerts more power and increases both the power and RPM of your car. 

Any irregularity in the machine like a spark plug, crankshaft position sensor, or other electronic components can cause improper acceleration and affect the RPM or the car’s output.

RPM Goes Up When Pressing Brake

Why Does My RPM Go Up When I Brake?

Although it is not common, you may sometimes observe RPM going up when pressing the brake. One of the most common reasons behind that is vacuum power-assisted brakes. 

When the brakes are applied, it may happen that the engine sucks some extra air from the brake vacuum chamber, increasing the RPM for a very short period.

This is a normal process, and until there is a leak in your brake system or spark plug, you don’t need to worry about this. 

If there is any vacuum sound right after applying the brake, then it can be a sign of a faulty brake booster which you should get replaced as soon as possible. 

It may also happen that your car reads out for the upcoming gear that will be applied after the brake if the gears are changed simultaneously while applying the brake, which can also cause an increase in RPM.

What Can Cause an Improper RPM?

RPM is determined and controlled by a wide number of electronic components, and any irregularity in any of them can cause a problem in the actual RPM production or its reading. Below are some of the electronic parts that might have gone bad, and what you need to do about them:

#1. Transmission Fluid

The Transmission fluid has a huge impact on the RPM of your car, and if there is a leak or extra flow of the transmission fluid, then it can significantly affect the RPM. 

A decrease in the supply or the transmission fluid can cause slipping of the gearbox band and can cause irregularity while changing gears or accelerating. 

You need to check your transmission fluid tank and replace it. If there is a leak, you should get it checked by a mechanic.


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#2. Worn Out Clutch 

A slippery clutch can cause a wide number of irregularities, and some of the most common of them are slipping, increase in RPM, overheating and many other problems. 

If the clutch is worn out and is slipping while driving, then it can cause an increase of the RPM of your car even though you are on a constant speed and not accelerating, burning more fuel.

You need to get the clutch tightened by a mechanic.

#3. Worn Out Spark Plug

One of the most common reasons behind an irregular RPM is the wearing out of the Spark Plug. 

Spark Plus is the most vital part of determining RPM, and if your spark plug is worn out, the efficiency of your car’s power and output will be greatly undermined. 

The Spark plug is responsible for the production of RPM, and if it gets worn out, the timing of the firing of the piston gets greatly influenced and causes improper acceleration and rougher driving. 

A worn-out spark plugs causes mistimed or sloppy movement of the piston, which in turn influences the acceleration and movement of your car. 

If your car’s spark plug is worn out, then you must get it replaced at the first sign as it will not influence your driving experience but also consume more fuel and damage other parts of the car.

In this case, you should replace the spark plug.

RPM Goes Up When Pressing Brake

#4. Faulty Reading meter

Keeping an eye out on the RPM is necessary to keep the performance of your engine and its output in check. If, by any chance, the reader of the RPM is working improperly, then you might exceed extra pressure on the engine even though your performance is on par. 

The crankshaft position sensor is responsible for reading the RPM of your car, and if by any chance you feel like you are getting an out-of-balance reading, you should get your sensor checked.

#5. Faulty REV Limiter

REV limiters are an essential part of the cars which have an internal consumption engine. Rev limiters keep a check on the power output of the vehicle and limit them from going to their maximum potential. 

It is used in order to ensure longer life of the car’s engine and also plays a vital role in the RPM calculation of your car. It limits your car from exceeding a certain limit of the RPM of your car, and if it works improperly, it will increase the power output and the safe limit of RPM while driving. 

#6. Improper Fuel Injectors

Having improper or dirty fuel injectors can cause an unwanted fuel supply in your engine. Having dirty fuel injectors will cause the collection of dust or other impurities into the machine, which will cause unusual power consumption and reduced efficiency of the engine. 

On the other hand, having an extra supply from the fuel injector can cause a surge in the performance of the engine. 

Although it may feel like your engine performance is increasing, having an extra supply than the limit will only cause fuel wastage and will exponentially decrease the efficiency of your car.


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How to Improve Your Cars Performance and RPM?

Maintaining the proper health of your car is essential in order to maintain its correct functioning and to work. If you feel like there is a degradation in your vehicle’s performance, then there can be a wide range of reasons behind it, and it is better to get them checked before they give rise to any other problem. 

You can follow some of the steps given below to ensure a healthy performance of your cars:

  • Clean the piston and engine regularly and ensure that no dust is settled down.
  • Maintain the supply of engine coolant along with brake fluids.
  • Keep the performance in check by taking them regularly to a service center.
  • Check for any leaks on a regular basis.
  • Make sure you don’t use any parts then its upper limit.

A Few Final Words

Your RPM meter shows you how your car is accelerating and how well your wheels are responding to the pressure on your accelerator. But rising RPM while braking can be a problem. We hope we have answered your queries, and you will be able to sort out the problem with the hints we have given

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Sean Mendez

Hi, I am Sean, a self-confessed petrolhead. I live in Boise, Idaho with a busy family of four and our energetic Labrador retriever. Thank you for visiting my website. You can find my email on the contact page.

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