In the process of using a car, accidents are inevitable. One of the common problems that cause many drivers a headache is a malfunctioning pedal brake.
After a period of use, the braking performance will decrease, making the brake fluid distribution to the calipers slow. You will feel when your system is unusable because no brake fluid is coming out when draining. The following article will guide you on how to troubleshoot brake fluid-related problems.
First, to fix the problem of no brake fluid coming out when bleeding, you need to find out why they can’t move.
Causes Of No Brake Fluid Coming Out When Bleeding
There are many reasons for the brake fluid not to flow out when discharging. But there are 4 reasons why this problem occurs:
- Broken screw bleed
- Wrong discharge procedure
- Faulty hose
- Bleed drain screw
As we all know, the discharge screw is an integral part of the exhaust system. It is located at the top of the brake caliper to melt the air in the brake fluid.
In fact, the remote valve always has to operate in harsh environments, in constant contact with dirt.
Therefore, the occurrence of rust and corrosion of screw pipes is inevitable. As a result, the screws can be removed but cannot be discharged because of a blockage in the exhaust system.
# Faulty brake hose
The hose is the part that supplies brake fluid from the cylinder and reservoir to the brake caliper. During use, the hose may be torn due to certain factors.
At that time, the brake system will not be able to pressurize and lead to brake bleeding. At that time, brake fluid will leak.
# Wrong discharge procedure
The flushing process is a common cause of brake fluid not draining when draining. Although this is an easy job, it requires absolute precision. Because when performing the wrong procedure, there will not be any brake fluid flowing out when discharging. For the discharge to proceed normally, you need to complete the following steps:
Step 1: We need to press the brake pedal to apply pressure to the brake circuit. At the same time, you need 1 other support person to carry out the discharge work. At this step, the brake pedal needs to press the pedal in rhythm 5-6 times, then hold them.
Step 2: To locate the bleeding screw, the person performing the discharge needs to remove the screw until the oil drains out slowly. Then they need to tighten the screw.
Step 3: Check the brake fluid level. If you notice that your vehicle’s brake fluid level is below the allowable limit, you need to refill the brake fluid before moving on to the next wheel. This test should be repeated 3/3 times for each cake until there is no more air.
In addition, when handling the exhaust process, you also need to pay attention to the power steering exhaust system. Because the influence of the wrong discharge process will affect the power steering. Therefore, you also need to learn about how to flush power steering fluid.
How To Fix This Problem?
After you have found the cause of the brake fluid not coming out when draining, the next job you need to do is fix them. The job takes a lot of your time. Usually, there will be 4 cases when you fix brake fluid problems.
# Case 1: no brake fluid from the master cylinder
For this case, you need to replace the brake fluid with a new one for your vehicle. It would help if you used brake fluid that is compatible with your vehicle. Because if you choose the wrong brake fluid, it will make the problem worse.
# Case 2: Faulty brake caliper
During the test, if there is no brake fluid to the wheel or a caliper does not flow, it is likely that the car brake caliper is faulty. The best way to fix the problem is to replace the brake calipers. At the same time, you need to carefully check the oil seal of the brake caliper pistons to make sure there is no brake fluid leak.
# Case 3: The brake pipeline has a problem
When driving, if you feel that the brake system is not working correctly, you need to check the brake fluid pipeline to the rear brake. Usually, this pipeline may have been corroded and cannot pressurize the rear wheel. If you detect the presence, you need to replace the brake line to ensure the safety of both people and vehicles.
# Case 4: The brake pedal is too light
If your brake pedal is too light and there’s no brake fluid coming to the front right and left front pairs, you need to check your car’s hoses. Usually, the hose will tear or corrode during use, causing brake fluid to leak out. When that happens, you need to replace the hose system immediately.
Some Frequently Asked Questions
How do I know if my master cylinder or booster is bad?
To identify a damaged car’s main cylinder or turbocharger, you can rely on the following 5 phenomena:
- Brake failure or brake pedal sink
- The engine is inefficient or stalls when using the brake
- Low brake pressure or hard, inadequate braking
- Brake fluid leak
- The brake light is on on the dashboard
Why are my brakes still soft after bleeding?
The main cause of foam brakes after bleeding is contaminated brake fluid. Usually, dirt (air, moisture, etc.) is the cause of the above problem.
What to do when bleeding brakes?
When the brakes bleed, you need to follow these steps in sequence to fix the problem:
- Step 1: Open the bleed valve
- Step 2: Use gravity, pressure, or vacuum to fill the brake fluid out
- Step 3: Fill the system and close the bleed valve
Hopefully, the article will help you better understand the cause of the brake fluid not flowing out when discharging and the main way to fix it. Depending on the situation, you will have different troubleshooting methods.
Usually, the work of checking and fixing problems related to brake fluid will be highly technical. Therefore, you should bring your car to reputable car maintenance centers so that they can best fix the problem.