<em>Nissan Almera</em>brake cylinder: do-it-yourself diagnostics, repair and replacement

Brake system Nissan Almera (especially models N16, N17 And G15) is a critical component, the health of which depends on road safety. One of the most vulnerable elements here is brake cylinder - how chief (GTC), and workers (on wheels). Service station statistics show that up to 30% of brake calls on Almera are associated specifically with wear or leakage of cylinders, and owners often ignore the first symptoms, leading to complete system failure.

In this article we will look at how self-diagnose malfunctions of the brake cylinders, which signs indicate the need for replacement, and how to carry out repairs without errors. We will pay special attention selection of spare parts (original vs analogues), nuances of working with Almera different generations and typical errors during replacementwhich lead to repeated breakdowns. If you notice that the brake pedal has become “soft” and the braking distance has increased, this instruction will help you save money at the service station and avoid emergency situations.

Types of brake cylinders on Nissan Almera: device and functions

On Almera Two types of cylinders are installed, each of which performs its own role:

• 🔧 Brake Master Cylinder (Brake Master Cylinder) — converts the force from the pedal into hydraulic pressure distributed along the circuits. On Almera N16/N17 used tandem gas turbine engine with two pistons (for separate front/rear circuits), on G15 — modified version with liquid level sensor.
• 🚗 Working cylinders - the brake pads are activated. On the front axle Almera are worth calipers with built-in cylinders, on the rear (drum brakes) - separate wheel cylinders (2 pieces per wheel).

GTZ on Almera integrated with vacuum booster (VUT), which reduces pedal effort. The working cylinders of the rear wheels often suffer from corrosion due to the ingress of dirt and moisture, and the GTZ from wear of seals (cuffs) and the formation of internal scuffing. For example, on Almera G15 after 100 thousand km replacement is often required GTZ repair kit, as the original cuffs lose their elasticity.

It is important to understand that Almera with ABS (anti-lock braking system) the cylinders work in conjunction with hydromodulator. When diagnosing malfunctions of the turbocharger or working cylinders, be sure to check ABS sensors - their mistakes can mask the symptoms of cylinder wear.

Signs of faulty brake cylinders: when to go for diagnostics

The first signs of cylinder problems are often ignored until the brakes begin to fail completely. Here key symptoms, requiring immediate verification:

• ⚠️ “Soft” or “sagging” brake pedal — a sign of air entering the system or fluid leakage from the gas turbine engine/working cylinders.
• 💦 Brake fluid leaks on the inside of the wheels (working cylinders) or under the hood near the VUT (GTC). On Almera N16 The GTZ rod seal often leaks.
• 🔥 Uneven braking or pulling to one side - may indicate jamming of the piston in the working cylinder (especially on the rear drums).
• 🛑 Increased braking distance - if the pads and discs are normal, the culprit is a low fluid level or wear on the cylinder seals.
• 🔊 Creaks or knocks When you press the pedal, wear may occur on the caliper guides or the pistons of the working cylinders.

On Almera G15 with ESP a faulty GTZ can cause error P0504 (inconsistency between brake and throttle sensor signals). If the dashboard lights up ABS badge or exclamation mark in a circle — first of all, check the brake fluid level and the condition of the cylinders.

⚠️ Attention: If the brake pedal “falls” to the floor and there is no fluid in the reservoir - It is prohibited to operate the car. This is a sign of a complete failure of the GTZ or depressurization of the system. Temporary solution: add fluid DOT-4 and go urgently for repairs.

Diagnostics of brake cylinders: step-by-step instructions

Before replacing cylinders, it is necessary to accurately determine the source of the problem. Here's how to do it without special equipment:

1. Checking the level and condition of the brake fluid

   Open the GTZ tank (located next to the VUT). The fluid should be between the marks MIN And MAX, without turbidity or sediment. On Almera liquid recommended DOT-4 (For example, Nissan Brake Fluid or Castrol React DOT4). If the fluid is black, a complete replacement with bleeding of the system is required.

2. Visual inspection of the turbocharger and working cylinders

   Jack up the car and remove the wheels. Inspect:

   • 🔍 GTZ — smudges on the body, rust on the rod.
   • 🔧 Working cylinders (on the rear drums) - wet spots on the boots or body.
   • 🛠️ Calipers (front wheels) - jammed pistons or torn boots.

System leak test

Have an assistant press the brake pedal while you watch the cylinders. If drops of liquid appear when pressed, the cylinder is faulty. On Almera N16 The GTZ rod seal often leaks (visible by a wet spot under the VUT).

Checking the pedal travel

With the engine not running, press the pedal 5-6 times, then hold it down and start the engine. The pedal should “go” down 1–2 cm. If it remains in place, the VUT or GTZ is faulty.

For accurate diagnosis GTZ can be used pressure gauge (connects to circuit fittings). The system pressure should be 80–100 bar with the pedal pressed. If the readings are lower, the cylinder is worn out.

Check the brake fluid level|Inspect the turbocharger and working cylinders for leaks|Test the brake pedal travel|Prepare a repair kit or new cylinders|Buy DOT-4 brake fluid (1 liter)-->

Selection of spare parts: original vs analogues for Nissan Almera

The reliability of the brakes depends on the quality of the cylinders, so saving on spare parts is dangerous. Below are proven options for different generations Almera:

Cylinder type	Original number	Analogs (brand + article)	Approximate price, ₽ (2026)
GTZ (N16/N17)	40520-4M000	TRW GTC100, Ate 03.4002-0160.2, Febi 23630	4 500 – 7 000
GTZ (G15)	40520-BM40A	Brembo C03.006, LPR 05C003	5 200 – 8 500
Rear working cylinder (drum)	40520-4M010 (left) 40520-4M011 (right)	TRW BCS1034, Ate 03.4002-0405.2, Febi 23628	1,200 – 2,500 (per piece)
Repair kit GTZ	40529-4M000	Nissens 47101, Kagero TN-001	800 – 1 500

When choosing analogues, pay attention to:

• 🔹 Housing material - original cylinders Nissan are made of aluminum alloy; cheap analogues are often made of cast iron (prone to corrosion).
• 🔹 Seal quality - in repair kits TRW or Ate cuffs made from ethylene propylene rubber (EPDM)resistant to DOT-4.
• 🔹 Complete set - in the original GTZ repair kit for Almera All seals, springs and protective caps must be present.

⚠️ Attention: On Almera G15 with the system ESP A GTZ with a liquid level sensor is installed. When replacing with an analogue without a sensor (for example, Febi 23630) you will have to purchase the sensor separately (40525-4M000) or disable the error C1100 in the ABS block.

Replacing the master brake cylinder with Nissan Almera: step by step guide

Replacing the GTZ with Almera requires accuracy and consistency. You will need:

• 🔧 Set of sockets and keys (10 mm, 12 mm, 14 mm).
• 🛠️ Special wrench for brake pipes (or open-end wrench 10 mm with an open mouth).
• 🧴Brake fluid DOT-4 (1 liter).
• 🧽 Rags, WD-40, copper sealing washers for pipes.

Step by step instructions:

1. Drain the brake fluid

   Unscrew the fittings on the working cylinders (starting from the rear right wheel) and drain the fluid into a container. On Almera with ABS, first disconnect the hydraulic modulator connector to prevent air from entering the system.

2. Remove the GTZ tank

   Disconnect the hoses from the tank (clamp them so that liquid does not leak out) and unscrew the two bolts securing the tank to the GTZ (10 mm).

3. Disconnect the brake lines

   Carefully unscrew the tubes from the GTZ using a special wrench. Don't bend the tubes - on Almera They are aluminum and break easily. Plug the holes with a rag.

4. Dismantle the GTZ

   Unscrew the two nuts securing the GTZ to the VUT (14 mm) and remove the cylinder. Clean the seat from dirt and old fluid.

5. Install a new GTZ

   Before installation, apply a thin layer DOT-4 on the sealing ring of the tank. Torque the GTZ 20–25 Nm, connect the pipes (use new copper washers) and the tank.

6. Bleed the system

   Start with the rear right wheel, then left rear, front right and left. On Almera with ABS, bleeding must be done using a scanner (for example, Launch X431), otherwise air will remain in the hydromodulator.

After replacing, check the pedal travel - it should be elastic, without dips. If the pedal remains “soft,” repeat bleeding or check the connections for leaks.

What should I do if, after replacing the GTZ, the pedal is “wooden”?

This is a sign of air getting into the system or a malfunction of the VUT. Check:

1. Tightness of the connections of the tubes with the GTZ (liquid leaks).

2. Operation of the VUT check valve (when the engine is not running, the pedal should have 2-3 “pumps”, then become hard).

3. Correct pumping (on Almera with ABS, a cycle of “open-close” the fittings is required 3-5 times on each wheel).

Replacing rear brake wheel cylinders: nuances for Almera

Working cylinders on rear drums Almera change in pairs - even if only one is leaking. To work you will need:

• 🔧 Keys 8 mm, 10 mm, 12 mm.
• 🛠️ Puller for retaining rings.
• 🧴Brake fluid and guide lubricant (Molykote G-4500).
• 🔨 Hammer and wooden spacer for knocking out cylinders.

Replacement algorithm:

1. Remove the drum

   Unscrew the guide pins (12 mm) and hammer the drum through the wooden spacer. If the drum is stuck, treat the joint WD-40 and wait 10–15 minutes.

2. Disconnect the brake pipe

   Clamp the tube with an adjustable wrench so as not to tear off the edges, and unscrew it from the cylinder. Plug the hole.

3. Remove old cylinders

   Unscrew the two bolts securing the cylinder to the shield (10 mm) and remove it. If the pistons are stuck, use a puller or carefully knock them out with a wooden block.

4. Install new cylinders

   Before installation, apply a thin layer DOT-4 on the pistons. Torque the cylinders 8–10 Nm and connect the tube (use new copper washers).

5. Adjust the pad clearance

   On Almera With drum brakes, after replacing the cylinders, you need to adjust the gap between the shoes and the drum. To do this:

   1. Нажмите педаль тормоза 10–15 раз.
   2. Поднимите рычаг ручного тормоза на 2–3 щелчка.
   3. Опустите рычаг и проверьте вращение барабана (должен крутиться без заклинивания).

6. Bleed the rear circuit

   Start with the right rear wheel, then the left. On Almera with ABS, bleeding of the rear cylinders must be done with the ignition on (the ABS pump must be running).

⚠️ Attention: On Almera N16 when replacing working cylinders they often break retaining rings on the pistons. Buy a repair kit with spare rings (40539-4M000) or take assembled cylinders.

Typical replacement mistakes and how to avoid them

Even experienced car owners make mistakes that lead to repeated breakdowns. Here are the most common:

• 🚫 Using old brake fluid — DOT-4 It is hygroscopic and after 2–3 years accumulates moisture, which leads to corrosion of the cylinders. Always change the fluid when replacing the turbocharger or working cylinders.
• 🚫 Incorrect pumping — if the sequence is not followed (rear right → rear left → front right → front left), air will remain in the system. On Almera With ABS, bleeding must be done using a scanner.
• 🚫 Tube pulling - aluminum tubes on Almera easily break with excessive force. Use a special wrench and do not exceed the torque 15 Nm.
• 🚫 Ignoring anthers - if you do not replace torn boots on the working cylinders, dirt will quickly damage the new cuffs.
• 🚫 Saving on copper washers - reusing old washers leads to leaks at the joints of the tubes.

Another common mistake is failure to check the vacuum booster before replacing the GTZ. If the VUT diaphragm is torn, the pedal will be hard even with a new cylinder. It’s easy to check VUT:

1. Stop the engine and press the brake pedal 5-6 times (removing the vacuum).
2. While holding the pedal, start the engine. If the pedal goes down, the VUT is working. If it remains hard, replacement is required.

FAQ: Frequently asked questions about brake cylinders Nissan Almera

🔧 Is it possible to repair the GTZ using a repair kit, or is it better to install a new one?

Repair kit (40529-4M000) is suitable if the GTZ housing does not have scoring or corrosion. On Almera N16/N17 with a mileage of up to 150 thousand km, repairs are justified, for G15 after 200 thousand km it is better to install a new cylinder - wear of the housing often leads to repeated leaks.

💰 How much does it cost to replace brake cylinders at a service station?

Prices in 2026:

• Replacing the GTZ: 3 000 – 5 000 ₽ (excluding cost of spare parts).
• Replacing working cylinders (per wheel): 1 500 – 2 500 ₽.
• Bleeding the brakes: 1 000 – 1 500 ₽.

On Almera with ABS the cost is 20–30% higher due to the need for diagnostic equipment.

⚠️ What happens if you drive with a current slave cylinder?

Consequences:

• Drop in brake fluid level → brake failure.
• Air entering the system → “soft” pedal and increased braking distance.
• On Almera with ABS, a cylinder leak can cause damage hydromodulator (repair cost - from 15,000 ₽).
• Corrosion of brake pads and drums due to fluid ingress.

The maximum permissible mileage with a leaking cylinder is 50–100 km (to the service station).

🔄 How often should you change brake fluid? Almera?

Recommendations:

• Every 2 years or 40,000 km - regardless of condition.
• After replacing the turbocharger or working cylinders.
• If the liquid has darkened or sediment is visible in it.

On Almera G15 with ESP fluid necessarily should be DOT-4 (not DOT-5.1!), otherwise the system may malfunction.

🛠️ Is it possible to replace rear drum brakes with disc brakes?

Technically possible, but you will need:

• Installation calipers, brake discs And hubs from Almera N16 with disc brakes.
• Replacement master cylinder to a model with a different pressure distribution.
• Reflashing the ABS unit (if there is one).

Cost of alteration - from 50 000 ₽. Officially Nissan does not support such tuning, so there may be problems with passing maintenance.