Brake master cylinder (GTZ) in Nissan Patrol - a critical component on which the safety of driving depends. Even minor malfunctions in its operation can lead to failure of the braking system, especially on SUVs with high weight and increased loads. Owners Patrol (especially models Y61 And Y62) often encounter problems with the turbocharger due to natural wear, corrosion or poor quality brake fluid.

In this article we will look at signs of trouble, we'll tell you how check the brake master cylinder without dismantling, and we will give step-by-step instructions for replacement. You will also find out what It’s better to choose spare parts (original vs analogues), and how to avoid common mistakes during repairs. The material is prepared taking into account the specifics Nissan Patrol and contains recommendations from car mechanics with experience working with Japanese SUVs.

Signs of a faulty master cylinder

The first symptoms of problems with the turbocharger are often confused with worn brake pads or air in the system. However there is unique features, which directly indicate cylinder failure:

  • 🚨 "Soft" brake pedal, which “falls” when pressed and slowly returns to its original position. This signals depressurization of cuffs or wear of the cylinder mirror.
  • 💧 Brake fluid leak under the pedal assembly or on the vacuum booster housing. B Patrol Y61 often leaks through the rear piston seal.
  • 🔄 Uneven braking: The car pulls to the side when you press the pedal hard, even if the pads and calipers are in good condition.
  • ⚠️ ABS lamp comes on (on Y62 with electronic systems) due to pressure drop in the circuit.

Particular attention should be paid to gradual decrease in brake fluid level in the reservoir without visible external leaks. This could mean that fluid is leaking into the vacuum booster through a damaged turbocharger - a problem that often goes undetected until the brakes fail.

⚠️ Attention: If after replacing the brake pads the pedal remains “wobbly” and bleeding the system does not help, with a 90% probability the master cylinder is to blame. B Nissan Patrol with the system 4WD this can lead to the rear wheels locking when braking!
📊 How often do you check the brake system of your Patrol?
  • Once every 6 months
  • Only when problems arise
  • Before long trips
  • Never checked

How to check the brake master cylinder without removing it

You can diagnose the GTZ yourself without resorting to dismantling. Here 3 reliable methods for Nissan Patrol:

  1. Brake pedal test:
    • 🔧 Turn off the engine and press the brake pedal 5-6 times at 2 second intervals.
    • 📉 If the pedal stroke increases with each press, there is air or GTZ cuffs are worn out.
    • 🔄 Keep the pedal pressed and start the engine. If the pedal goes to the floor, the cylinder does not hold pressure.
  • Leak test:

    Inspect the junction of the GTZ with the vacuum booster. On Patrol Y61 often leaks through rear oil seal, and on Y62 — through the front piston seal. Use a flashlight to detect traces of liquid.

  • Pressure diagnostics:

    Connect the pressure gauge to the brake line fitting (for example, on the front caliper). When you press the pedal, the pressure should rise smoothly. Sharp rises or falls indicate wear of the cylinder mirror.

    • For accurate diagnosis you can use scanner ELM327 (for Y62 with ABS/VDC). Errors C1100 or C1105 often associated with low pressure in the circuit due to a faulty turbocharger.

    💡

    If you hear a hissing sound from under the hood when braking, check the vacuum booster. Its malfunction may mask problems with the master cylinder, especially on diesel engines. Patrol with the system EDC.

    Selecting a master cylinder for Nissan Patrol

    Present on the market original spare parts, analogues from Aisin, TRW, Brembo and budget options. For Nissan Patrol It is critical to select a cylinder taking into account:

    • 🔧 Models and years of manufacture: GTZ for Y61 (1997–2016) And Y62 (2010–present) not interchangeable due to different piston diameters (23.8 mm vs 25.4 mm).
    • 🔄 Brake system type: Cars with ABS And VDC require cylinders with a pressure sensor (for example, the original 40520-4W000 for Y62).
    • 💰 Budget: The original will cost 12–18 thousand rubles, TRW — 8–12 thousand rubles, budget analogues (Febi, Mapco) - 4–6 thousand rubles.
    Manufacturer Article Applicability Average price, rub. Features
    Nissan (original) 40520-4W000 Patrol Y62 (2010–present) 15 000 New fittings and o-rings included
    TRW PMC1200 Patrol Y61/Y62 (gasoline/diesel) 9 500 Reinforced piston design, suitable for harsh conditions
    Aisin BRS-001 Patrol Y61 (until 2010) 7 800 Japanese quality, but may require modification of fittings
    Febi 22363 Patrol Y61 (diesel) 5 200 Budget option, but the resource is 30–40% lower than the original

    When choosing an analogue, pay attention to seal material. For Patroloperated in off-road conditions, it is better to take cylinders with Teflon cuffs (For example, TRW or Brembo), which are resistant to aggressive brake fluid DOT 5.1.

    ⚠️ Attention: On Nissan Patrol Y62 with the system Hydraulic Body Motion Control Installing a non-original gas turbine engine can lead to malfunctions VDC. In this case, the control unit firmware is required!

    Step-by-step replacement of the master cylinder

    Replacing the GTZ with Nissan Patrol requires accuracy and consistency. Approximate operating time is 2–3 hours. You will need:

    • 🔧 Set of sockets and keys (10, 12, 14 mm).
    • 🛠 Brake fluid DOT 4 or DOT 5.1 (1 l).
    • 🧴 Lubricant for brake cylinders (Molykote or Slipkote).
    • 🔄 Transparent hose for bleeding (∅ 4–5 mm).
    • 🧲 Magnet for bolts (so as not to drop the fasteners into the engine compartment).

    Disconnect the negative battery terminal|Drain the brake fluid from the reservoir|Disconnect the fluid level sensor connector (if equipped)|Put a rag under the cylinder to collect any remaining fluid-->

    Step 1: Removing the old cylinder

    1. Remove the brake fluid reservoir cap and pump out the fluid with a syringe.
    2. Disconnect the tubes from the GTZ, having previously marked them with a marker (on Patrol Y62 there are 4 of them: two for the front contour, two for the rear).
    3. Unscrew the two nuts securing the cylinder to the vacuum booster (12 mm wrench).
    4. Carefully remove the cylinder without damaging the vacuum booster rod.

    Step 2. Installation of a new gas turbine engine

    1. Apply a thin layer of lubricant to the pistons of the new cylinder.
    2. Place the cylinder in place, aligning the rod with the hole in the amplifier.
    3. Tighten the fasteners and connect the brake lines using new copper O-rings.
    4. Fill with new brake fluid and bleed the system (start with the farthest wheel - the rear right).

    On Patrol Y62 after replacing the turbocharger, it may be necessary reset adaptations in the block ABS using a diagnostic scanner (for example, Launch X431). Without this, the brake pedal may remain “wobbly” even after bleeding.

    💡

    When installing a new GTZ, never press the brake pedal until all pipes are fully connected - this can push the pistons out of the cylinder and damage the seals!

    Typical replacement mistakes and how to avoid them

    Even experienced mechanics make mistakes when working with GTZ on Nissan Patrol. Here 5 most common:

    • 🔧 Using old brake fluid. The liquid absorbs moisture, which leads to corrosion of the new cylinder. Always change it completely!
    • 🔄 Incorrect pumping. On Y62 with VDC you need to bleed the system in strict sequence: rear right → front left → rear left → front right.
    • ⚠️ Re-tightening of fittings. Excessive tightening force will cause cracks in the cylinder body. Tightening torque: 12–15 Nm.
    • 💧 Ignoring the vacuum booster. If you do not check the amplifier for leaks when replacing the turbocharger, air will be sucked into the system and the pedal will remain soft.
    • 🔧 Lack of adaptation after replacement. On Patrol Y62 With electronic systems, errors must be reset via the diagnostic connector.

    On diesel versions Nissan Patrol Y61 with the system EDC after replacing the turbocharger, it may be necessary to relearn the throttle valve, since the engine control unit is connected to the brake system via the CAN bus.

    What happens if you don’t bleed the system after replacing the turbocharger?

    If you leave air in the brake system, the brake pedal will “spring” and the braking distance will increase by 2–3 times. On Nissan Patrol with a weight of more than 2.5 tons, this can lead to loss of control during emergency braking, especially on slippery surfaces. In addition, air in the system accelerates corrosion of metal parts and reduces the life of the new cylinder.

    Maintenance of the brake system after replacing the turbocharger

    To help your new brake master cylinder last longer, follow these guidelines:

    • 📅 Change brake fluid every 40,000 km or once every 2 years. In off-road conditions (for Patrol) reduce the interval to 30,000 km.
    • 🔧 Check the fluid level in the reservoir every 5,000 km. A sharp drop in level may indicate a leak in the turbocharger or calipers.
    • 🔄 Use only the recommended fluid:
      • DOT 4 - for Patrol Y61 (until 2010).
      • DOT 5.1 - for Patrol Y62 (since 2010) with systems ABS/VDC.
    • ⚠️ Avoid mixing liquids different standards - this leads to foaming and brake failure.

    For Nissan Patrolused in difficult conditions (towing, off-road), it is recommended to install reinforced brake hoses (for example, from Goodridge) and check the condition of the calipers every 20,000 km.

    FAQ: Frequently asked questions about the brake master cylinder Nissan Patrol

    Can the brake master cylinder be repaired or is it just a replacement?

    Theoretically, the GTZ can be repaired (replace the cuffs and polish the mirror), but in practice this is impractical. Firstly, repair kits for Nissan Patrol cost 60–70% of the price of a new cylinder. Secondly, after polishing, the service life of the cylinder is reduced by 2–3 times. The exception is rare models (for example, Patrol GR Y60), where original spare parts are difficult to find.

    Why does the brake pedal remain hard after replacing the GTZ?

    This is a typical problem on Patrol Y62 with a new type vacuum booster. Reasons:

    1. The booster check valve is faulty (check it by blowing into the hose - air should only flow in one direction).
    2. The vacuum booster hose is clogged (blow it out or replace it).
    3. The rod between the turbocharger and the amplifier is incorrectly adjusted (should protrude by 1–2 mm).
    What kind of brake fluid to pour into Nissan Patrol Y61 after replacing the turbocharger?

    For Y61 (1997–2016) manufacturer recommends DOT 4. However, if the car is operated under high load conditions (towing, mountain roads), it is better to use DOT 5.1 with a boiling point not lower than 260°C. Do not use DOT 5 silicone based - it is incompatible with rubber seals Nissan!

    How much does it cost to replace a gas turbine engine at a service station for Nissan Patrol?

    The cost of work depends on the region and model:

    • Patrol Y61: 3,500–5,000 rub. (excluding spare parts).
    • Patrol Y62: 5,000–8,000 rub. (additional diagnostics may be required ABS/VDC).

    In Moscow and St. Petersburg, prices are 20–30% higher. There is no point in saving on work - mistakes when replacing the gas turbine engine can lead to brake failure.

    Is it possible to drive with a faulty brake master cylinder?

    Absolutely not! Even if the brakes are still “working,” a faulty turbocharger may fail at any time, especially during heavy braking. On Nissan Patrol Due to the large weight of the car, this is fraught with an accident. If you notice signs of a malfunction (soft pedal, leaks), contact service immediately or change the cylinder yourself.