<em>Nissan Primera P12</em> rear caliper repair kit: complete selection and replacement guide

Nissan Primera P12 - a car that, despite its advanced age, continues to delight owners with reliability and comfort. However, even the most proven models have weaknesses, and one of them is rear caliper. Over time, its pistons wear out, the boots crack, and the guides become sour, which leads to uneven wear of the pads, squeaking and even jamming of the brakes. In this article we will figure out how to choose the right rear caliper repair kit, avoid fakes and perform the replacement yourself without errors.

Many owners Primera P12 are faced with a dilemma: should I buy an original kit or an analogue? Is it worth replacing the caliper completely or is a repair kit enough? We analyzed the reviews of the masters, studied the articles and compiled a checklist of critical points that need to be paid attention to. We have also prepared step-by-step instructions with photos and video recommendations, so that even a beginner can cope with the task.

Why does the rear caliper wear out? Nissan Primera P12?

Rear caliper Primera P12 (like most cars with disc brakes) works in aggressive conditions: temperature changes, dirt, moisture and constant friction. Main causes of wear:

• 🔥 Overheating — during intense braking, the caliper temperature can reach 300–400°C, which leads to deformation of the anthers and burnout of the lubricant.
• 💧 Corrosion — the guides and piston oxidize due to the ingress of water and reagents, especially in winter.
• ⚙️ Natural wear and tear - rubber seals lose elasticity through 80–100 thousand km, and the piston may jam.
• 🚗 Poor quality service — using cheap lubricant or ignoring the replacement of anthers accelerates the failure of the caliper.

First signs of trouble: squeaking noise when braking, uneven wear of the pads (the inner ones wear out faster), jamming of the caliper (the wheel heats up after a trip) or a brake fluid leak. If you notice at least one of the symptoms, it’s time to check the caliper and prepare for repairs.

⚠️ Attention! Ignoring rear caliper problems Primera P12 may lead to complete failure of the brakes on one wheel - this is critical for safety! When the piston jams, the pad constantly rubs against the disc, which leads to overheating and even fire.

Which rear caliper repair kit to choose: original or analogue?

There are three options for repair kits on the market: Nissan Primera P12:

1. Original (Nissan) - article number 40520-4M000 (for left caliper) and 40521-4M000 (for the right one). The kit includes a piston, boot, O-ring and lubricant. Pros: 100% compatibility, long service life. Cons: price from 3 500 ₽ per side.
2. Premium analogues — brands ATE, TRW, Brembo. Articles:
   • ATE — 03.9902-3724.2 (set for 1 caliper).
   • TRW — PFC3724 (full repair kit).

Price: 2 000–2 800 ₽. The quality is comparable to the original, but cheaper.

Budget analogues — Febi, Blue Print, Sasic. Article Febi: 23724. Price: from 800 ₽. There is a risk of running into fake or low quality rubber.

Which one to choose? If your budget allows, take it ATE or TRW. They supply components to the assembly lines of many automakers, including Nissan. The original is only justified during warranty repairs or if the car is registered with an official service center. Budget analogues are suitable for temporary repairs, but they will have to be replaced more often.

Brand	Article	Price (for 1 caliper)	Pros	Cons
Nissan (original)	40520-4M000/40521-4M000	3 500–4 200 ₽	100% compatible, durable	High price, rarely available
ATE	03.9902-3724.2	2 200–2 600 ₽	Quality like the original, availability	Sometimes you come across fakes
TRW	PFC3724	2 500–2 800 ₽	Improved anthers, reliable seals	The price is close to the original
Febi	23724	800–1 200 ₽	Low price, fast delivery	Service life is 2–3 times less

Step-by-step instructions for replacing the rear caliper repair kit

Replacing the repair kit with Primera P12 Requires care and basic skills in working with the braking system. If you have never done this before, it is better to contact the service. For self-repair you will need:

• 🔧 Set of sockets and keys (10–17 mm).
• 🛠️ Special puller for the caliper piston (or clamp).
• 🧴Brake fluid DOT-4.
• 🧽 Brake cleaner (BRAKE CLEANER).
• 🔩 New caliper guides (article no. 40540-4M000).

Important! Before starting work, remove the negative terminal from the battery and prepare a container for draining the brake fluid. Do not use WD-40 to clean the caliper - only specialized products!

Drain the brake fluid to the MIN level in the reservoir|

Disconnect the handbrake cable (if it interferes)|

Clean the caliper from dirt BRAKE CLEANER|

Prepare a new repair kit and lubricant for the guides (TRW PFG110 or ATE Plastilube)|

Secure the car on stands (do not use a jack!) -->

Step 1: Removing the Caliper

Unscrew the two bolts securing the caliper to the bracket (head on 14 mm). Carefully remove the caliper and hang it on a wire so as not to damage the hose. Do not disconnect the brake hose - this will allow air to enter the system!

Step 2: Removing the Piston

Using a puller or clamp, press the piston back into the cylinder. If the piston is jammed, do not knock on it! Water around the seal. BRAKE CLEANER and gently loosen it with pliers. After removal, clean the cylinder of old grease and corrosion.

Step 3: Installing a new repair kit

Lubricate the new piston and O-ring brake lubricant (not ordinary lithol!). Install the boot onto the piston, then carefully press the piston into the cylinder. Make sure the boot is not twisted!

Step 4: Assembly and pumping

Reassemble the caliper in reverse order. After installation it is necessary bleed the brakesto remove air from the system. Check the operation of the caliper: press the brake pedal - the piston should move out smoothly, without jerking.

Typical mistakes when replacing a repair kit and how to avoid them

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

1. Using the wrong lubricant - litol, grease or WD-40 destroy rubber seals. Use only special grease for calipers (For example, TRW PFG110 or ATE Plastilube).
2. Twisted boot — if the piston boot is installed crookedly, it will quickly rupture and dirt will get into the cylinder. Check its position before assembly!
3. Unbleeded brakes — air in the system leads to a “soft” pedal and reduced braking efficiency. Bleed the brakes strictly according to the following diagram: rear right → rear left → front right → front left.
4. Jammed guides — if the guides are not lubricated or replaced, the caliper will jam. Article number of new guides: 40540-4M000.

⚠️ Attention! If, after replacing the repair kit, the brake pedal becomes “wobbly” or the car pulls to the side - stop driving immediately! These are signs of air in the system or a faulty caliper. Re-bleeding or leak check is required.

When do you need to change the entire caliper, and not just the repair kit?

The repair kit only saves you when the rubber elements and piston wear out. But there are cases when the caliper is subject to complete replacement:

• 🔧 Cracks or deformation of the housing - Even a small crack can lead to brake fluid leakage.
• 💥 Severe cylinder corrosion - if the inner surface of the cylinder is covered with rust, the new piston will quickly jam.
• 🔥 Overheating and deformation — if the caliper “lead” due to high temperatures, it can no longer be restored.
• 🚗 Wear of guides “into an ellipse” — if the holes for the guides are broken, the new set will not last long.

Cost of a new rear caliper Primera P12:

• Original (Nissan) — 8 000–10 000 ₽.
• Analogue (ATE, TRW) — 5 000–7 000 ₽.
• Budget (Febi, Blue Print) — 3 000–4 500 ₽.

If the caliper needs to be replaced, select complete with guides and bracket - this will save time and guarantee compatibility of parts. Article number of the original caliper: 40510-4M000 (left) and 40511-4M000 (right).

How to check a caliper for repairability?

1. Inspect the housing for cracks or signs of brake fluid leakage.

2. Check the inner surface of the cylinder - if there are deep scratches or corrosion, the repair kit will not help.

3. Measure the diameter of the guide pins with a caliper. If wear exceeds 0.2 mm, they need to be replaced.

4. Try to manually move the caliper along the guides - if there is play or it “sticks”, you need to replace the guides or the entire caliper.

Caliper lubricant: which one to choose and how to apply?

How long the repair kit will last depends on the quality of the lubricant. On Primera P12 You cannot use universal lubricants - only specialized ones that are resistant to high temperatures and are not aggressive to rubber. Best options:

Lubricant type	Brand/Article	Temperature range	Where to apply
Copper paste	Liqui Moly Kupfer-Paste (7655)	to 1100°C	Guides, back side of pads
Synthetic lubricant	TRW PFG110	from -40°C to 300°C	Piston, O-rings
Ceramic lubricant	ATE Plastilube (03.9902-0501.2)	to 1200°C	Guides, anthers

How to apply lubricant?

1. Clean the parts BRAKE CLEANER and dry with compressed air.
2. Apply a thin layer of lubricant to guides (don't overdo it - excess will attract dirt!).
3. Lubricate piston and o-ring before installation into the cylinder.
4. Apply copper paste to back side of the pads (only on metal parts, not on friction material!).

⚠️ Attention! Never use graphite lubricant or lithol - they destroy the rubber seals and cause the caliper to jam. Also avoid mineral oil based lubricants (eg CV joint-4).

How much does it cost to replace a repair kit at a service center?

If you are not confident in your abilities, it is better to entrust the work to professionals. The cost of replacing a rear caliper repair kit with Nissan Primera P12 in services in Moscow and regions:

Service type	Cost of work (for 1 caliper)	Cost with spare parts (ATE/TRW)
Official dealer Nissan	2 500–3 500 ₽	5 000–6 500 ₽
Specialized car service	1 500–2 200 ₽	3 500–4 500 ₽
Garage craftsmen	1 000–1 500 ₽	3 000–4 000 ₽

You can save money if you buy spare parts yourself and bring them to the service center. Many workshops charge less for work if the client provides supplies. Also check if the price includes bleeding the brakes — some services consider this a separate service (500–1 000 ₽).

FAQ: Frequently asked questions about the rear caliper repair kit Nissan Primera P12

Is it possible to drive if the caliper boot is torn?

No! The boot protects the piston from dirt and moisture. If it is torn, sand and water will enter the cylinder, causing damage. piston corrosion and caliper seizure. At the first sign of damage to the boot (cracks, tears), you need to urgently replace it.

How often do you need to change the caliper repair kit?

Recommended interval - 100–120 thousand km or every second brake pad replacement. However, if the car is operated in aggressive mode (city traffic jams, frequent braking), the repair kit may wear out within 60–80 thousand km. Be sure to inspect the calipers at every maintenance!

Is it possible to repair a seized caliper piston?

If the piston is jammed due to corrosion, it is sometimes possible to “reanimate” it: soak the caliper in BRAKE CLEANER for several hours, then carefully loosen the piston with pliers. However, this is a temporary solution - This caliper won't last long. It is better to replace the repair kit or the caliper completely.

What is the difference between repair kits for left and right calipers?

On Primera P12 left and right calipers not interchangeable! They have different articles:

• Left: 40520-4M000 (original) or 03.9902-3724.2 (ATE).
• Right: 40521-4M000 (original) or PFC3724 (TRW).

The boots and pistons in the kits also have different shapes. Specify the side when purchasing!

Do I need to change brake hoses when replacing a repair kit?

Be sure to check the condition of the hoses! If they are cracked, swollen or have traces of leaks, replace them (40600-4M000 for Primera P12). Aging hoses lead to ruptures under pressure, which can lead to complete loss of brakes.