Braking system on Nissan Almera Classic requires careful attention, since your safety and the safety of others depends on its serviceability. Over time, air accumulates in the hydraulic line, which makes the pedal soft and reduces the effectiveness of stopping the vehicle. Many car owners believe that this procedure cannot be performed independently without sophisticated equipment, but this is a misconception.
The brake bleeding procedure is the process of removing air bubbles from circuits filled with brake fluid. For Nissan Almera Classic This is especially true after replacing calipers, cylinders or hoses, or during routine maintenance. If the pedal sinks to the floor or feels “wobbly”, then there is air in the system and you need to act immediately.
Preparing tools and work area
Before you start working, you need to create a safe space. The car should be parked on a flat surface, preferably on an inspection hole or overpass, to provide access to the lower bleeder fittings. It is imperative to install wheel chocks under the wheels, since you will be directly under or next to the car.
You will need a standard set of wrenches, specifically a size 8 wrench for unscrewing the fittings, and a clear plastic tube that fits snugly over the nipple. Don't forget to prepare a container to collect used fluid and a new canister of high-quality brake fluid. For Nissan Almera Classic It is recommended to use standard fluid DOT-4, which meets factory specifications.
- 🔧 8-size wrench (preferably a socket wrench so as not to tear off the edges)
- 🧴 Clean brake fluid (minimum 1 liter)
- 🔴 Transparent tube of suitable diameter
- 🪣 Container for draining old waste
It is important to check the fluid level in the reservoir before starting work. If it is low, add fresh fluid to the maximum. Never use old fluid from an open canister., since it has already absorbed moisture from the air, which can lead to corrosion of the system and a decrease in the boiling point.
⚠️ Attention: Brake fluid has an aggressive effect on the paintwork of the body. If a drop falls on Nissan Almera Classic, wash it off immediately with water, otherwise a permanent stain will appear.
Sequence for bleeding the brake circuits
Hydraulic system Nissan Almera Classic built according to a diagonal division scheme. This means that if one circuit fails, the second will still work. Therefore, the bleeding order is strictly regulated: you need to start with the wheel farthest from the main brake cylinder. For your model, this is the rear right wheel, then the rear left, the front right and finally the front left.
Start with the rear right wheel. Unscrew the wheel, find the bleeder nipple on the caliper and put a transparent tube on it, lowering the other end into a container with a small amount of liquid. The assistant should sit in the cabin and smoothly press the brake pedal until you open the fitting. When opened, a stream of liquid with air bubbles will come out.
As soon as the stream becomes clean and free of bubbles, tighten the fitting, and only after that can the assistant release the pedal. Violation of this sequence will result in air being sucked into the system again. Repeat the procedure until a clean stream comes out of the tube without a single bubble.
- 🚗 Order: Rear Right → Rear Left → Front Right → Front Left
- 🛑 First, open the fitting, then release the pedal (when squeezing)
- ✅ We tighten the fitting only when the pedal is fully depressed
If you don't have a helper, you can use a vacuum pump or the pedal pump method, where you push and hold the pedal yourself, then quickly open the fitting and tighten it before the pedal goes down. However, with an assistant, the quality of work will be much higher.
- Simple key and tube
- Vacuum pump
- Pneumatic pumping
- Two people by hand
The nuances of working with the rear brake mechanism
Rear brakes on Nissan Almera Classic often raise questions due to the presence of a handbrake mechanism. If you replaced the rear calipers or drums, air may have become trapped in the upper channels. In some cases, it may be necessary to use special tools to retract the piston to make room for air to escape.
Pay special attention to the condition of the fitting boots. If they are torn, dirt will enter the system and clog the valve. Before starting work, be sure to clean the fitting from dirt and rust with a brush. This will prevent abrasive from entering the hydraulics when unscrewing.
⚠️ Caution: Do not over-tighten the bleeder fitting, as the brass body will easily crack from excessive force, resulting in leakage and costly repairs.
Sometimes air gets stuck in the slave cylinder due to the vehicle being tilted incorrectly. If the car is parked in a pit, check whether the rear axle is lowered too low. Sometimes jacking up the rear is enough to level the system and allow air to escape more easily.
☑️ Preparing the rear wheel
Common mistakes and how to avoid them
The most common mistake is to allow the fluid level in the reservoir to drop to zero. If this happens, the master cylinder will pump new air into the system and the whole process will have to start over. Monitor the fluid level and add it as needed, but do it quickly to avoid introducing moisture.
The second mistake is using expired fluid or mixing different types of fluids. The chemical composition of the liquids may not match, which will lead to the formation of sediment or destruction of rubber seals. Always use only the liquid specified in the instructions Nissan Almera Classic.
Do not attempt to bleed the system if you have doubts about the integrity of the lines. Microcracks in the hoses can allow air to pass through when you press the pedal, and you will circulate the air in a circle without achieving results. A visual inspection of all hoses is a mandatory step before starting work.
- ❌ Do not allow the fluid level in the reservoir to drop below the minimum
- ❌ Do not mix liquids of different brands and standards
- ❌ Do not ignore visual inspection of hoses for cracks
If after bleeding the pedal is still soft, the problem may not only be in the air. This could be wear on the master cylinder or microcracks in the hoses. In such cases, simple pumping will not help, and diagnostics by professionals will be required.
What should I do if the pedal doesn't feel firm?
If the pedal remains soft after fully bleeding all wheels, check the brake master cylinder. Often the problem lies in worn cuffs inside it, which allow fluid to leak back. Also check if fluid is leaking from under the fittings or in the caliper area.
Specifications and data table
To properly maintain the system, it is important to know the exact parameters. Brake fluid must have certain characteristics in order to perform effectively at high temperatures and low humidity levels. Below is a table with the main parameters that are relevant for Nissan Almera Classic.
| Parameter | Meaning | Comment |
|---|---|---|
| Liquid type | DOT-4 | Standard specification for all model years |
| Boiling point (dry) | min. 230°C | Ensures operation without steam formation |
| Boiling point (wet) | min. 155°C | Important for safety in high humidity |
| System volume | about 0.6 l | It is recommended to have a reserve of 1 liter |
Knowing these parameters will help you choose the right liquid in the store. Saving on brake fluid is unacceptable, since cheap analogues often cannot withstand operating temperatures, which leads to a sharp decrease in braking efficiency in an emergency.
Using high-quality DOT-4 fluid and strictly following the bleeding procedure is the key to reliable operation of the brake system.
Checking the result and completing the work
After all four wheels have been bled, you need to make sure the system is reliable. Check the fluid level in the reservoir and add it to the mark MAX. Make sure the reservoir cap is closed tightly to prevent future air and moisture from entering.
Sit behind the wheel and press the brake pedal several times with the engine off. It should be elastic and not fall through. After this, start the engine and test the brakes while driving on a safe section of the road. Braking should be smooth, without beating or skidding.
Inspect the connection points of the tubes and fittings for leaks. If everything is in order, you can put the wheels in place and tighten the bolts with the recommended tightening torque. Don't forget to put away your tools and clean your work area.
⚠️ Warning: Before driving on a busy highway, be sure to test drive at low speed to ensure that the brakes work in real-world conditions.
After bleeding, be sure to check the brake fluid level after a week of use, as remaining air may finally escape and the level may drop slightly.
FAQ: Frequently asked questions
Is it possible to bleed the brakes alone without an assistant?
Yes, it's possible. You can use a vacuum pump or the “pumping” method, where you press the pedal, hold it, open the fitting, tighten it and only then release the pedal. However, the quality of pumping with an assistant will be higher.
Which brake fluid is best for Nissan Almera Classic?
It is recommended to use standard fluid DOT-4 from trusted manufacturers. Avoid mixing different types of fluids as this may cause a chemical reaction and damage the rubber seals.
Why does the brake pedal remain soft after bleeding?
This may be due to the fact that air remains in the system (the pumping order is disrupted), the master brake cylinder is worn out, or there are microcracks in the hoses. It is also possible that there is a faulty caliper in the system.
How many times do you need to change brake fluid?
The manufacturer recommends changing the brake fluid every 2-3 years or 40,000 km, depending on operating conditions. The liquid is hygroscopic and absorbs moisture over time, reducing its properties.
What to do if the bleeder fitting is stuck?
Do not use excessive force immediately. Use a penetrating lubricant (such as WD-40), let it sit for 15-20 minutes, then try to gently wiggle the fitting. If it does not give in, it is better to contact a specialist so as not to break it.