Front brake caliper <em>Nissan Almera G15</em>: device, malfunctions and replacement

Nissan Almera G15 is a popular sedan that is valued for its reliability and ease of maintenance. However, even this model has weak points, and one of them is the **front brake calipers**. Over time, they wear out and begin to jam or leak, which directly affects traffic safety. In this article we will look at how the caliper works Almera G15, what malfunctions occur most often, and how to fix them yourself or at minimal cost.

A special feature of the calipers on this model is their design with a **single-piston system** and a floating caliper. This simplifies repairs, but requires a careful approach to diagnostics. If you notice a squeaking sound when braking, uneven pad wear, or the car pulling to the side, most likely the problem is in the caliper. Next, we will analyze all aspects in detail: from the selection of spare parts to step-by-step replacement.

Front caliper device Nissan Almera G15

Caliper on Almera G15 (body N17, 2012–2018) is a **floating caliper** type with a single piston. Its key elements:

• 🔧 Caliper housing — aluminum or cast iron (depending on the year of manufacture), attached to the hub with two bolts.
• 🛠️ Piston — the only one with a rubber boot and an O-ring. Piston diameter - 54 mm (for most modifications).
• 🧲 Guide pins — 2 pieces, provide mobility of the bracket. They often turn sour due to lack of lubrication.
• 🔩 Brake pads - are held in place by spring clips. Original articles: 40520-BM40A (front).

Design feature - **lack of built-in parking brake** (on Almera G15 it is implemented through the rear drum mechanisms). This simplifies the design of the front caliper, but requires regular checking of the guides and boots. If at least one of the elements fails, this leads to uneven wear of the pads or jamming.

Important: on restyled versions (after 2015), the calipers may have slight differences in the fastening of the bracket, but the design remains fundamentally the same. When purchasing spare parts, always check VIN code car or year of manufacture.

Signs of a caliper malfunction: when diagnostics are needed

Problems with the caliper Almera G15 appear gradually, but it is dangerous to ignore them. Here are the key symptoms:

• 🚗 The car pulls to the side when braking - a sign of jamming of the piston or guides.
• 🔊 Creaking or grinding - often caused by pad wear, but may indicate corrosion of the guides.
• 💨 Brake disc overheating — if the disc is hot after stopping, the caliper does not release the pads.
• 🛢️ Brake fluid leak — a wet mark is visible on the inside of the wheel (the piston boot is damaged).
• 🔄 Uneven pad wear — one side wears out faster (the guide is jammed).

The most common problem in Almera G15 — **souring of the guide fingers**. This occurs due to the lack of lubrication or its poor quality. As a result, the bracket does not move freely, the pads do not move away from the disc, which leads to accelerated wear and overheating.

⚠️ Attention! If, after replacing the pads, the brake rotor becomes hot even under light braking, check the caliper immediately. Driving for a long time with a jamming mechanism leads to disc deformation and expensive repairs.

To diagnose, just remove the wheel and visually inspect the caliper:

1. Check the mobility of the bracket - it should move easily by hand.
2. Inspect the piston boot for cracks or fluid leaks.
3. Make sure the guide pins are free of rust and move freely in the holes.

How to check the caliper without removing the wheel?

Press the brake pedal and release immediately. If the caliper is working properly, the pads should move away from the disc in 1-2 seconds (checked by touch through the wheel spokes). If the disk remains hot, the mechanism jams.

Articles and analogues: what to choose for replacement

Original calipers for Nissan Almera G15 are produced under the article numbers:

• Right caliper: 40510-BM400 or 40510-BM40A (depending on the year).
• Left caliper: 40511-BM400 or 40511-BM40A.

The cost of the original is from 8,000 to 12,000 rubles per piece (for 2026). However, there are proven analogues that are not inferior in quality:

Brand	Article	Price (per piece)	Features
TRW	GDB1460 (right), GDB1461 (left)	5 500–7 000 ₽	High quality seals, suitable for aggressive driving.
Brembo	P 85 030	6 000–8 500 ₽	Reinforced design, long service life.
ABS	360192	4 000–5 500 ₽	A budget option, but requires frequent checking of the guides.
Fenox	SBP3001S1 (set)	7 000–9 000 ₽	Good price-quality ratio, suitable for temperate climates.

When choosing an analogue, pay attention to:

• 🔹 Housing material — aluminum is preferable (lighter and less corrosive).
• 🔹 Complete set — the kit must contain guides, boots and lubricant.
• 🔹 Certification - look for markings ECE R90 or DOT.

⚠️ Attention! Do not buy calipers without markings or with inscriptions such as "Made in China" without indicating the brand. Such parts often have poor-quality seals, which leads to brake fluid leakage after 10–20 thousand km.

Step-by-step replacement of the front caliper with Almera G15

Replacing a caliper is a moderately difficult task, but if you have the tools and instructions, you can do it yourself. You will need:

• 🔧 Set of sockets and keys (on 14, 17).
• 🔨 Socket wrench for guides (usually 7 mm).
• 🧴 Caliper lubricant (for example, TRW PFG110 or Slipkote 220-R DBC).
• 🩹Brake fluid DOT-4 (for pumping).
• 🛠️ Jack and stops.

Work order:

1. Raise the car, remove the wheel and disconnect the negative battery terminal (for safety).

2. Unscrew the two bolts securing the caliper to the hub (head on 17).

3. Disconnect the brake hose from the caliper (insert a fluid container first!). Use the key on 10 for fitting.

4. Remove the caliper, then remove the pads and guides. Clean the seats from dirt.

5. Install the new caliper in reverse order. Don't forget to lubricate the guides!

6. Bleed the brake system (see section below).

Check the integrity of the piston boot|

Apply lubricant to guide pins|

Make sure the brake hose is not kinked|

Bleed the system after installation -->

Important nuance: on Almera G15 when replacing a caliper it is often necessary replacing brake hoses, especially if they are over 5 years old. Rubber cracks over time, which can lead to rupture under pressure.

Bleeding the brakes after replacing the caliper

After installing a new caliper, be sure to bleed the brake system to remove air. For Almera G15 pumping order: right rear → left rear → right front → left front wheel.

Instructions:

1. Place a transparent hose onto the bleeder fitting (on the caliper), and lower the other end into a container with liquid.
2. Ask an assistant to press the brake pedal 3-4 times and hold it down.
3. Unscrew the fitting ½ turn - the liquid with air will come out into the container. Tighten the fitting until the pedal hits the floor.
4. Repeat until no more air bubbles come out.

Important:

• 🔹 Monitor the liquid level in the tank - it should not fall below MIN.
• 🔹 Use only new fluid DOT-4 (For example, Nissan KE909-99932).
• 🔹 After pumping, check the pedal stroke - it should be elastic, without failures.

⚠️ Attention! If the pedal remains soft after bleeding, check the system for leaks. Possible causes: loose fitting, damaged hose or faulty brake master cylinder.

Caliper repair: when to restore and when to replace only

The caliper does not always require complete replacement. In some cases it can be repaired:

• 🔧 Replacing the boot and piston sealing ring - if the piston is not damaged, and the leak is caused by rubber wear.
• 🛠️ Cleaning and lubricating the guides - if they do not have deep corrosion.
• 🔨 Piston groove - for minor scuffing (requires special equipment).

Repair is possible if:

• The caliper body has no cracks.
• The piston moves without jamming after cleaning.
• The thread for the bleeder fitting is not broken.

Replacement is required if:

• The piston has deep scoring or corrosion.
• The caliper body is deformed or cracked.
• The guides are “stuck” and cannot be restored.

Cost of repairs in service - from 2,000 to 4,000 ₽ (excluding spare parts). If you decide to restore the caliper yourself, use repair kits:

• Nissan — 40526-BM400 (boot + seals).
• TRW — PFG110 (lubricant + repair kit).

How to remove the piston without compressed air?

If the piston does not come out under brake fluid pressure, use a clamp. Attach it to the caliper so that it presses on the piston through a wooden spacer (so as not to damage the surface).

Common mistakes when working with calipers Almera G15

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

1. Using the wrong lubricant. Do not use under any circumstances Litol or Solid oil - they cannot withstand high temperatures. Only specialized compounds for calipers (for example, Slipkote).

2. Dragging guides. Twist them tightly 25–30 Nm (use a torque wrench).

3. Ignoring the condition of the brake discs. If the disc has a runout of more than 0.05 mm, it needs to be sharpened or replaced.

4. Incomplete bleeding of brakes. Air in the system may remain in the master cylinder - bleed all circuits.

Another typical problem is incorrect pad installation. On Almera G15 they are installed with special anti-creaking plates. If they are not installed or the sides are mixed up, the pads will squeal and wear out quickly.

⚠️ Attention! After replacing the caliper, avoid sudden braking for the first 200–300 km. Pads and discs need time to break in.

FAQ: Frequently asked questions about calipers Nissan Almera G15

Is it possible to drive if the caliper is stuck?

Short-term - possible, but extremely undesirable. A jammed caliper leads to:

• Overheating of the brake disc (risk of deformation).
• Accelerated pad wear.
• Increased fuel consumption (due to constant resistance).

If the caliper jams too much (the wheel heats up after 5–10 km), you cannot move under your own power - call a tow truck.

How often should the guides be lubricated?

The manufacturer recommends checking the condition of the guides every 30,000 km or every time you replace the pads. The lubricant needs to be updated:

• When creaking or jamming occurs.
• After washing the car (water washes away the lubricant).
• Before the winter season (low temperatures worsen the properties of the lubricant).

Which brake pads are best to install with a new caliper?

For Almera G15 optimal options:

• Original — 40520-BM40A (soft, little dust, but wear out quickly).
• TRW — GDB1546 (average wear, good braking).
• Ferodo — FDB1460 (hard, durable, but can creak).
• Brembo — P 85 034 (sports version, high price).

When replacing a caliper, it is recommended to use pads of the same brand as the caliper (for example, TRW caliper + TRW pads).

What should I do if my brakes become soft after replacing the caliper?

Probable reasons:

1. There is still air in the system - repeat bleeding.
2. The master brake cylinder is faulty (check for leaks).
3. The brake hoses are worn out (they swell when you press the pedal).
4. The new caliper is defective (check the piston for leaks).

First, inspect the hoses and connections for leaks. If everything is in order, bleed the system again.

Is it possible to paint calipers on Almera G15?

Yes, but with reservations:

• Use only heat resistant paint (withstands up to 600°C, for example, Motip Brake Caliper Paint).
• Do not paint the piston, boot or working surfaces.
• Before painting, clean the caliper from dirt and degrease.

It is better to paint with the caliper removed to prevent paint from getting on the pads or disc.