<em>Nissan Pathfinder R51</em> rear brake discs: how to select and replace correctly

Nissan Pathfinder R51 is one of the most popular crossovers in its class, but even such a reliable car requires timely maintenance of the brake system. The rear brake discs play a key role here: they not only provide effective braking, but also affect the vehicle's stability when driving off-road or with a trailer. Unlike front discs, rear discs wear out more slowly, but their condition is often overlooked - and this can lead to uneven braking, vibrations and even caliper seizure.

In this article we will look at everything you need to know about rear brake discs for Pathfinder R51: from original articles and proven analogues to step-by-step instructions for replacement and nuances that even experienced mechanics miss. We will pay special attention signs of critical wear, the choice between ventilated and non-ventilated disks, as well as common installation errors that can cut the life of new parts in half.

Original and similar brake discs for Nissan Pathfinder R51: articles and features

Rear brake discs for Pathfinder R51 (2005–2012) have the original article 40520-4M000 (for models with engines VQ40DE And VQ25DE) or 40520-4M001 (for versions with V9X diesel). These discs are non-ventilated, with a diameter 302 mm and thickness 12 mm (minimum permissible thickness - 10.4 mm). Important: restyled models (from 2010) may have wheels with different parameters, so check the vehicle’s VIN code before purchasing.

Among the analogues, the most popular are:

• 🔹 ATE (article 24.0120-0159.1) - German quality, increased wear resistance, but the price is 20–30% higher than the original.
• 🔹 Brembo (article 09.9662.11) - optimal price/quality balance, often installed on the conveyor.
• 🔹 TRW (article DF4565) - a budget option, but with a reduced resource (on average 15–20 thousand km less than the original).
• 🔹 DBA (article DBA42642BLK) is an Australian brand with perforated wheels for aggressive driving.

When choosing analogues, pay attention to material of manufacture: cheap discs made of low-quality cast iron can become deformed when overheated, which will lead to the steering wheel beating. Also check availability protective coating — without it, the discs rust after just a few months of use in wet weather.

Signs of worn rear brake discs: when replacement is required

Rear brake discs on Pathfinder R51 serve on average 80–120 thousand km, but this indicator greatly depends on driving style and operating conditions. The main symptoms indicating the need for replacement:

• 🚨 Vibration or beat on the steering wheel when braking (especially at speeds above 80 km/h).
• 🚨 Creaks and rattles on the rear wheel side - often caused by uneven wear or sand getting between the disc and pad.
• 🚨 Increased braking distance — the rear wheels begin to “slow down” later than the front wheels.
• 🚨 Visible grooves or cracks on the surface of the disk (more than 0.5 mm).
• 🚨 Uneven wear - one side of the disk is thinner than the other (checked with a caliper).

The critical thickness of the rear discs for the Pathfinder R51 is 10.4 mm. If the disk has worn down to this value, it must be replaced, even if it looks normal on the outside. Exceeding this threshold is fraught with overheating of the brake fluid and brake failure.

⚠️ Attention: If after replacing the pads the braking distance has increased and the pedal has become “soft”, most likely the discs are already worn to the limit. In this case, new pads will wear out 2-3 times faster due to the uneven surface of the disc.

Symptom	Probable Cause	Recommendations
Vibration when braking	Disk deformation (overheating or impact)	Check the disc runout; if the value is >0.15 mm, replace it
Creaking sound without pressing the pedal	Corrosion or dirt between the disc and the protective shield	Clean the surface; in case of deep corrosion, replace
Pulling the car to the side	Uneven disc wear or caliper jamming	Check the thickness of the discs and the condition of the caliper guides
Brake pedal pulsation	Uneven disc surface (grooves, waves)	Grooving (if thickness allows) or replacement

Ventilated vs non-ventilated disks: which is better for Pathfinder R51?

Standard rear wheels Pathfinder R51 - unventilated, but many owners install ventilated ones to improve cooling. Let's look at the pros and cons of each option:

Non-ventilated discs:

• ✅ 20–40% cheaper.
• ✅ Easier to install (does not require caliper modification).
• ✅ Sufficient for standard use (city, highway without extreme loads).

Cons: overheat faster during prolonged braking (for example, on a serpentine road with a trailer), which leads to deformation and increased wear of the pads.

Ventilated discs:

• ✅ Better cooling - the risk of overheating is reduced by 30-40%.
• ✅ They last longer during intensive use (off-road, towing).
• ✅ Less susceptible to deformation.

Cons: more expensive, require compatible pads (with a larger contact area), and may not fit standard calipers without modifications.

For most owners Pathfinder R51 non-ventilated disks are the best choice. Ventilated ones are justified only if:

• 🔥 You often drive with a trailer or overload your car.
• 🔥 You practice aggressive driving (sharp acceleration/braking).
• 🔥 You operate the car in a mountainous area.

Step-by-step instructions for replacing rear brake discs with Nissan Pathfinder R51

Replacing rear discs with Pathfinder R51 more difficult than on the front ones due to the integrated parking brake. You will need:

• 🔧 A set of sockets and keys (especially 17 mm And 19 mm).
• 🔧 Puller for brake discs (or two M8 bolts for pressing out).
• 🔧 WD-40 or similar penetrating lubricant.
• 🔧 New discs and pads (recommended to be replaced as a set).
• 🔧 Torque wrench (for tightening with the correct torque).

Work order:

1. Preparation: Jack up the car, remove the rear wheel and unscrew the caliper guides (17 mm). Hang the caliper on a wire to avoid damaging the hose.
2. Removing the old disk: Unscrew the disk fixing screw (19 mm, an impact wrench may be required). If the disc gets stuck, use a puller or carefully knock it down with a hammer through a wooden spacer.
3. Cleaning the hub: Remove rust and dirt from the hub with a wire brush. Apply a thin layer copper grease to the seat of the new disk.
4. Installing a new disk: Place the disc on the hub and secure with the screw. Make sure the surface is level and not distorted.
5. Assembly: Install new pads, lubricate the caliper guides high temperature grease (For example, Slipkote 220-R DBC) and reassemble everything in reverse order.
6. Bleeding the brakes: After replacement, bleed the brake system, as air may have entered when pressing the caliper piston.

Clean the surface of the disc from preservative grease|Check the free play of the brake pedal|Make sure there are no brake fluid leaks|Test the parking brake (should hold for 3-4 clicks)|Check the disc runout (maximum 0.1 mm)-->

⚠️ Attention: When replacing rear discs with Pathfinder R51 often forgotten adjust the parking brake. After installing new discs (which are thicker than worn ones), the handbrake cables may not provide sufficient pressure to the pads. Adjustment is made through the nut on the cable equalizer under the machine.

Typical replacement mistakes and how to avoid them

Even experienced mechanics make mistakes when working with rear brakes Pathfinder R51. Here are the most common:

1. Ignoring the condition of the hub. Rust or dirt on the disk seat will lead to its distortion and beating. Always clean the hub down to bare metal.
2. Lack of lubrication on the caliper guides. This causes piston seizure and uneven pad wear. Use only high temperature grease (regular lithol is not suitable!).
3. Incorrect bolt tightening. Overtightened caliper or hub bolts can deform the disc. Tightening torque for Pathfinder R51:
   • Caliper bolts - 30–35 Nm.
   • Disc fixing screw - 80–100 Nm.

Saving on pads. Installing new discs with old pads will lead to their rapid wear due to uneven fit.

They forget to bleed the brakes. After pressing the caliper piston, air could enter the system - this will reduce braking efficiency.

On a Pathfinder R51 with a V9X diesel engine, the rear discs often become stuck to the hub due to corrosion. To avoid problems the next time you replace, apply a thin layer of anti-corrosion compound (for example, Liqui Moly Kupfer-Spray) onto the disk space.

What to do if the disc cannot be removed?

If the disc is stuck to the hub, do not hit it directly with a hammer - this may deform it. Instead:

1. Spray the joint with WD-40 and wait 10-15 minutes.

2. Screw two M8 bolts into the disc holes and tighten them evenly until the disc moves.

3. If that doesn’t help, use a three-jaw puller or gently heat the disc with a hair dryer (do not overheat the wheel bearing!).

Brake disc maintenance: how to extend their service life

Rear brake disc service life Pathfinder R51 can be increased by 30–50% if you follow simple rules:

• 🛠️ Regular cleaning. Every 10 thousand km Clean the discs from dirt and rust (especially on the inside). Use special cleaners (for example, Brembo Cleaner), but do not wash the rims with high-pressure water - this may damage the wheel bearing.
• 🛠️ Brake fluid control. Old fluid (over 2 years old) boils at a lower temperature, which accelerates disc wear. Change it every 40 thousand km or once every 2 years.
• 🛠️ Proper running-in of new discs. First 200 km After replacement, avoid sudden braking - this will allow the pads to rub in evenly.
• 🛠️ Checking the calipers. Every 20 thousand km lubricate the caliper guides and check the integrity of the boots. A jammed caliper can erase the disc in 5 thousand km.

If you frequently drive off-road or tow a trailer, install discs with perforation or notches (For example, DBA 4000 Series). They dissipate heat better and self-clean from dirt, but require more frequent pad replacement.

Cost of work and parts: where is it more profitable to change disks

Prices for rear brake discs for Nissan Pathfinder R51 vary by brand and region:

Part/Job	Price (original)	Price (analog)	Cost of work (service station)
Brake disc (1 piece)	8 000–12 000 ₽	3 500–7 000 ₽	—
Pad set	4 000–6 000 ₽	1 500–3 500 ₽	—
Replacing discs (pair) + pads	—	—	3 000–5 000 ₽
Disc groove (1 pc.)	—	1 000–1 500 ₽	500–800 ₽
Adjusting the parking brake	—	—	500–1 000 ₽

Replacing it yourself will cost less, but requires experience. If you have never worked with the brake system, it is better to contact a service station - errors when replacing discs can lead to brake failure in a critical situation. The average cost of a comprehensive replacement (discs + pads + labor) at the service is - 15 000–25 000 ₽.

There is no need to skimp on parts: cheap discs (for example, no-name from China) can crack within 10 thousand km, and low-quality pads will “eat” the disc in 20 thousand km. The best option in terms of price/quality ratio - Brembo or ATE.

FAQ: Frequently asked questions about rear brake discs Nissan Pathfinder R51

Is it possible to sharpen the rear discs instead of replacing them?

Grooving is possible if the thickness of the disc after processing remains at least 10.4 mm (minimum permissible value for Pathfinder R51). However, keep in mind that the groove weakens the structure of the disk, and it may become deformed the next time it overheats. If the disk is already thinner 11 mm, it's better to replace it.

How often should you check the condition of your rear discs?

It is recommended to inspect the disks every 20 thousand km or once a year. Pay special attention to:

• The thickness of the disc (measured with a caliper).
• The presence of grooves or cracks.
• The condition of the caliper (are there any brake fluid leaks).

If you notice squeaks or vibrations, diagnostics are needed immediately.

Which pads are best for rear discs? Pathfinder R51?

Optimal options:

• Original (40525-4M000) - soft, make little noise, but wear out quickly.
• Brembo P68056 - universal choice, suitable for ventilated discs.
• ATE 13.0460-7210.2 - durable, but the first ones may creak 500 km.
• Ferodo FDB1889 — the best option for off-road (high temperature resistance).

Do not install pads with metallic compounds (such as EBC Redstuff) - they quickly wear out the discs.

Why did the brakes get worse after replacing the discs?

Possible reasons:

1. Incorrect running-in - first 200 km sudden braking should be avoided.
2. If air gets into the system, the brakes need to be bled.
3. Incompatibility of pads and discs (for example, too hard pads on soft discs).
4. Caliper jamming - check the guides and piston.

If the problem does not go away after 500 km, contact for diagnostics.

Is it possible to put front discs on the rear axle?

No! Front and rear discs on Pathfinder R51 have different:

• Diameter (320 mm front vs 302 mm rear).
• Thickness (28 mm front vs 12 mm rear).
• Design (front ones are ventilated, rear ones are not).

Installing front discs on the rear axle will result in uneven braking and may damage the wheel bearing.