Procedure for replacing brake fluid Nissan Bluebird Sylphy is not just routine maintenance, but a critical operation to ensure the safety of the driver and passengers. Over time, the hydraulic fluid in the system absorbs moisture from the atmosphere, which leads to a decrease in the boiling point and, as a result, to “sinking” of the pedal during heavy braking.
Owners of sedans of this model are often faced with the need for self-service, since service centers may offer inflated prices or do not have specific equipment for older models. Bleeding the brakes requires attention to detail, the presence of an assistant and adherence to a strict sequence of actions, otherwise air can remain in the system, creating a deadly danger on the road.
Preparation of tools and work area
Before you begin, you need to prepare a garage or box with a flat floor and sufficient lighting. To carry out the bleeding procedure you will need a set of wrenches, a container for working off, a hose and a new brake liquid DOT-3 or DOT-4 standard recommended by the manufacturer.
It is important to ensure that the vehicle is securely secured. Use jacks and safety stands, since working under the machine without reliable support is unacceptable. Remove all wheels to gain access brake calipers and cylinders.
- 🛠️ Set of sockets and wrenches (usually 8, 10, 12 mm)
- 🛢️ Clean plastic bottle with the top cut off
- 🔧 Transparent vinyl hose that fits tightly onto the fitting
- 🧤 Protective gloves and glasses to protect against caustic liquids
Don’t forget to also prepare rags and a product to remove oil stains from the body, as brake fluid aggressive to paintwork. If you plan to change the fluid completely, calculate the volume to be approximately 0.5–0.8 liters, depending on the condition of the system.
⚠️ Attention: Never use old fluid drained from the system to refill. Even visually clean waste contains microscopic air bubbles and moisture, which negates the entire pumping procedure.
☑️ List of required tools
Rules for working with brake fluid
Brake system Nissan Bluebird Sylphy operates on a closed circuit principle, where pressure is transferred from the master cylinder to the wheel mechanisms. Any air entering this circuit disrupts power transmission, making the pedal soft and ineffective. Therefore, the use of fresh, hermetically sealed hydraulic fluid is a prerequisite.
Please note that the hygroscopicity of a liquid means its ability to absorb moisture from the air. An open bottle should not be left unattended, even for a few minutes. If you see fluid in the master cylinder reservoir darkened, this is a sure sign of the need for a complete replacement, and not just a partial top-up.
Work carefully, avoiding splashing. Contact with plastic or rubber may cause it to swell and break down over time. If you spill some liquid on the body, wash it off immediately with plenty of water.
- 🚫 It is prohibited to mix liquids of different brands and standards (DOT-3, DOT-4, DOT-5.1)
- 💧 Avoid getting moisture into the open tank during operation
- 🧼 Immediately wipe up any spilled liquid with a damp cloth
What happens if you add DOT-5 instead of DOT-4?
DOT-5 is a silicone fluid that does not mix with glycol fluids (DOT-3, DOT-4). If you put DOT-5 in a system designed for glycol, separation, blistering and complete brake failure will occur. Rubber seals in the system can also become deformed due to chemical incompatibility.
Determining the correct bleeding sequence
The key to a successful procedure is following the order of pumping the wheels. On most models Nissan Bluebird Sylphy With front-wheel drive, the diagram looks like this: from the furthest wheel from the master cylinder to the closest. Usually it is rear right, then rear left, front right and front left.
However, depending on the year of manufacture and the specific modification of the suspension, the order may differ slightly. Always check the technical documentation or the sticker under the hood if there is one. An incorrect sequence may result in air not being released from the far circuit while you are working on the near one.
It is important to monitor the fluid level in the master cylinder reservoir. If it empties during operation, you will draw air into the system again, and the procedure will have to start from the beginning. Add fresh fluid every 2-3 pedal presses.
- Two people (pedals)
- With vacuum pump
- With back pressure
- On your own without an assistant
Maintaining the "far to near" sequence is critical to removing all air pockets from the long system lines.
Pumping technique with an assistant
The classic bleeding method requires the participation of two people: one is in the cabin behind the wheel, the second is at the wheel being pumped. The process begins with the assistant slowly pressing the brake pedal all the way and holding it in that position. At this time you unscrew the bleeder fitting caliper or wheel cylinder.
Liquid and air will begin to flow out through the transparent hose into the container. As soon as the flow stops and the pedal begins to fall, the assistant should tighten the fitting and then release the pedal. This cycle is repeated until clean liquid without air bubbles comes out of the hose.
After each cycle, be sure to check the level in the tank. If you are working alone, you can use special tools, but the classic method remains the most reliable for Nissan. Take your time, take breaks so that the pedal returns completely to its original position.
- 👣 An assistant presses the pedal 3-4 times and keeps it pressed
- 🔧 You unscrew the fitting and watch the liquid coming out
- 🔒 Tighten the fitting all the way, only after that the assistant releases the pedal
⚠️ Attention: Never unscrew the fitting until the pedal is held down by an assistant. This will cause air to enter the system through an open channel.
Features of working with rear disc brakes
On the model Bluebird Sylphy the rear wheels are often equipped with disc brakes with an integrated handbrake mechanism. This creates certain difficulties when replacing the fluid, since the caliper piston has a special design.
Sometimes a preliminary check of the condition of the handbrake mechanisms is required. If the mechanism is soured, the piston may not return to its original position, which makes pumping difficult. In some cases, it is necessary to unscrew the handbrake cable to release the mechanism.
It is also worth paying attention to the condition of the anthers and caliper guides. If they are damaged, air may be sucked through them when the system is operating. Replace worn elements before bleeding to avoid repeat work.
Before working on the rear calipers, be sure to check that the guides move easily. If they stick, the pedal may feel soft even after successful bleeding.
Table of quantities and specifications
For accurate planning of work, it is useful to know the volume of brake fluid required for a complete replacement. Below is a table with approximate data for various modifications of the model.
| Modification | Liquid type | Volume (full replacement) | System Features |
|---|---|---|---|
| 1.5 (G11) | DOT-4 | 0.6 l | Classic scheme |
| 1.6 (G11) | DOT-4 | 0.65 l | Classic scheme |
| 1.8 (G12) | DOT-4 | 0.7 l | Strengthened system |
| 2.0 (G12) | DOT-4 | 0.75 l | Strengthened system |
Please note that the values given are approximate. The actual volume depends on the degree of wear of the system and the number of components replaced. Always have a supply of liquid.
⚠️ Attention: If you see that the volume of fluid leaking significantly exceeds the norm, this may indicate a line rupture or a malfunction of the master cylinder.
Checking the result and test drive
After completing the bleeding procedure for all four wheels, you must carefully check the tightness of the system. Inspect all fittings for leaks. The brake pedal should be firm and not sink when held down for a long time.
Before driving on the road, perform a test braking test with the vehicle stationary. Press the pedal firmly several times. If the pedal remains firm and does not drop below the usual level, the system is ready. If the pedal is soft, there may be air left in the system and the procedure must be repeated.
The first ride should be at low speed in a safe location. Test the brakes in different modes: smooth deceleration, sharp pressing. Make sure the vehicle does not pull to the side when braking, which could indicate uneven pressure in the circuits.
- ✅ The pedal is solid and does not fall when held down
- ✅ No fluid leaks on calipers and pipes
- ✅ The car stops smoothly, without skidding
Successful bleeding is confirmed not only by the absence of air in the hose, but also by a stable, firm brake pedal during a test ride.
Frequently Asked Questions
Is it possible to bleed the brakes alone?
Yes, there are special devices (vacuum pumps or check valves) that allow one person to bleed the system. However, the classic method with an assistant is considered more reliable and controllable, especially for beginners.
How often does the brake fluid need to be changed on a Nissan Bluebird Sylphy?
The manufacturer recommends changing the fluid every 2 years or 40,000 km, whichever comes first. In humid climates or active use, the period may be reduced to 1 year.
What should I do if the brake pedal becomes soft after replacement?
Most likely there is air left in the system. Check that the bleeding sequence is correct and that an assistant is holding the pedal correctly. Also check the fluid level in the reservoir.
Can DOT-5.1 fluid be used instead of DOT-4?
DOT-5.1 fluid is compatible with DOT-4 and DOT-3, as they are all glycol based. However, DOT-5 (silicone) is strictly incompatible. It is better to use what is recommended by the factory - usually DOT-4.
How can you tell if there is air in the system?
The main symptom is a soft, “cotton” brake pedal that falls when pressed. You may also feel the need to press the pedal repeatedly before stopping.