Car brake system Nissan Primera P12 deserves special attention, especially if you are planning long trips or often operate the car in the city cycle with frequent stops. The rear brakes on this model often go unnoticed until a characteristic squeaking sound appears or braking efficiency decreases. Ignoring this issue can lead to expensive caliper repairs or even an emergency on the road.
Replacement process rear pads This generation has its own technical features that distinguish it from front-wheel drive cars with simple disk mechanisms. You will need to understand the design of the drum brake (for base trims) or the specific parking brake mechanism inside the disc caliper (for versions with disc brakes at the rear). The correct procedure guarantees not only safety, but also the absence of problems with the handbrake after completion of the work.
Design features of the rear brakes of the Primera P12
Before you begin disassembly, you must clearly determine the type of brake system installed on your car. Most versions Nissan Primera P12 are equipped with rear disc brakes, but the mechanism for pressing the pads and parking brake is designed differently here than on the front wheels. Inside the caliper there is often a separate mechanism, working on the principle of drum brakes, which pushes the pads apart when the handbrake lever is tightened.
The main difficulty when replacing is the need for correct installation caliper piston. Unlike front brakes, where the piston is simply pressed in, this requires a rotating motion while pressing simultaneously. If you try to force it in without rotating, the piston threads will be damaged, resulting in the need to replace the entire caliper. It is also important to consider the wear of the guides, which often become sour due to lack of lubrication.
Many owners are faced with a problem when, after replacing the brake pads, the handbrake does not hold the car on a slope. This occurs due to improper adjustment of the gap between the shoes and the parking brake drum. It is critical to adjust the handbrake cable tension immediately after assembly., otherwise the braking efficiency will be insufficient. It is also worth paying attention to the condition of the guide boots, since their damage leads to rapid failure of the pistons.
- π§ Check the availability of a specialized tool for pressing the piston with rotation.
- π Inspect the brake disc for beats and deep grooves before installing new elements.
- π’οΈ Stock up on high-quality lubricant for the guide calipers and pins of the handbrake mechanism.
- π© Prepare a torque wrench to accurately tighten the caliper mounting bolts.
Required tools and materials
To perform the work efficiently, you will need a set of tools that will allow you to safely remove the wheel and disassemble the brake mechanism. A standard set of wrenches may not be enough, since the caliper mounting bolts often have non-standard sizes or require a specific approach due to corrosion. Do not skimp on the quality of the tool so as not to tear off the edges of the bolts.
Be sure to prepare a new set brake pads and, preferably, a caliper repair kit, including new guides and boots. Even if the old guides look intact, their service life is often exhausted and they will not ensure smooth running of the caliper. Use of original spare parts Nissan or proven analogues from brands like Tokico or TRW will ensure long service life of the system.
Also donβt forget about cleaning and protective products. Brake dust and dirt can significantly affect the performance of a new mechanism. Use a special brake cleaner that leaves no residue and evaporates quickly. The grease must be heat-resistant and intended specifically for brake systems; ordinary lithium grease will not work here and can corrode the rubber seals.
- π A set of socket heads (usually 12, 14, 17 mm) and wrenches.
- π οΈ Special tool for compressing the caliper piston (or a universal set).
- 𧴠Brake Cleaner in an aerosol can.
- 𧀠Protective gloves and glasses for working with chemicals.
βοΈ Preparation for replacement
Step-by-step instructions for replacing pads
Begin work by securing the vehicle on a level surface and applying the handbrake. Raise the rear of the car with a jack and be sure to place safety stands under the body. Remove the wheel and clean the brake mechanism from dirt. Loosen the caliper guide bolt, but do not remove it completely until you are ready to remove it.
Remove the caliper by hanging it on a wire from the body so as not to damage the brake hose. Remove the old pads and carefully inspect the inside of the mechanism. If you have disc brakes with a drum mechanism inside, you will need to remove the retaining ring and springs to get to the inner drum. Carefully remove the handbrake mechanism, being careful not to lose the small springs.
Install new pads, having previously lubricated the contact points with the caliper with special lubricant. It is important not to lubricate the working surface of the pad itself and the disc. Press in the caliper piston using the special tool and turning it clockwise. Reinstall the caliper, tighten the guides to the required torque and reassemble the mechanism in reverse order.
After assembly, be sure to check the operation of the handbrake. It should hold the car on the slope, but not be tightened too much. If necessary, adjust the cable tension through the hatch on the brake disc or in the passenger compartment. Spin the wheel freely to make sure there is no friction or binding.
- π Raise the car and remove the wheel to access the brake mechanism.
- π© Unscrew the lower guide bolt and remove the caliper.
- π§Ή Clean the seats from rust and dirt.
- π§ Press in the piston and install new pads.
What to do if the piston does not press in?
If the piston does not budge, check the brake fluid level in the reservoir. If the tank is full, unscrew the cap or pump out some of the liquid. Also make sure you are turning the piston in the exact direction your caliper requires (usually clockwise, but there are exceptions).
- Disc with handbrake mechanism
- Drums
- I don't know, I need to check
- Other type
The nuances of adjusting the hand brake
Adjusting the parking brake to Nissan Primera P12 - This is a critical stage that inexperienced craftsmen often miss. The pad release mechanism inside the caliper requires precise adjustment of the gaps. If the gap is too large, the handbrake will not work, and if it is too small, the pads will rub against the disc even with the lever lowered, which will lead to overheating and rapid wear.
The adjustment procedure is often carried out through a special hole in the brake disc or through an adjusting bolt on the cable. You need to find the adjusting nut and tighten it until the shoes lightly touch the drum, and then turn it back a few turns to create operating clearance. This requires patience and care as the adjustment affects the lever force.
After adjustment, check the number of handbrake clicks. Normally, the lever should lock in the range of 3 to 6 clicks. If there are more clicks, the gap is too large. If less, the mechanism is over-tightened. It is also worth checking the free movement of the cable and the absence of distortions at the attachment points.
β οΈ Attention: Do not overtighten the adjusting nut! This can cause the rear wheels to brake constantly, causing the brakes to overheat and even catch fire during prolonged driving.
Correctly adjusting the handbrake strikes a balance between securely holding the vehicle and preventing the pads from rubbing against the disc while driving.
Common replacement mistakes and how to avoid them
One of the most common mistakes is using the wrong lubricant. Many car owners use graphite lubricant or lithol, which can melt or corrode rubber seals at high temperatures. This leads to jamming of the pistons or guides. Always use specialized high-temperature lubricants designed for brake systems.
Another common problem is ignoring the condition of the brake disc. Installing new pads on a worn or deformed disc will cause the steering wheel to wobble when braking and reduce the efficiency of the system. Before installing new elements, be sure to measure the thickness of the disc and check for deep grooves. If the disc is worn out, it must be replaced or sharpened.
It is also important not to forget about cleaning the caliper from old dirt and corrosion. If the guides are not cleaned and lubricated, the caliper will jerk, causing uneven pad wear. In some cases, complete replacement of the guides is required, since their wear is no longer compensated by lubrication.
β οΈ Caution: Never press the brake pedal until the calipers are fully installed and the bolts are tightened. This can cause pistons to fly out and brake fluid to be lost.
Before starting work, unscrew the cap of the brake fluid reservoir and place a rag under it. When the pistons are pressed in, the fluid level will rise and it may spill out, staining the paintwork.
Technical specifications and compatibility table
When selecting spare parts, it is important to focus on the technical characteristics of your car. The sizes of pads and brake discs may vary depending on the year of manufacture and equipment. Below is a table with the main parameters that will help you choose the right parts.
| Parameter | Meaning | Comment |
|---|---|---|
| Brake disc thickness | 12 mm (minimum) | Safety critical parameter |
| Brake disc diameter | 280 mm / 300 mm | Depends on the configuration |
| Number of guides | 2 pcs. | Be sure to check their condition |
| Handbrake mechanism type | Built-in drum | Requires separate adjustment |
| Caliper bolt tightening torque | 35-40 Nm | Use a torque wrench |
The table shows average values, but always check the part numbers for your specific model. For example, versions with more powerful engines may have stronger brakes with a larger disc diameter. Incorrect selection of parts can lead to them simply not fitting into place or not working correctly.
FAQ: Answers to frequently asked questions
How long does it take to replace rear pads on a Nissan Primera P12?
On average, the process takes from 1 to 1.5 hours per wheel if you have experience working with the brake system. For a beginner, this may take longer, especially when adjusting the handbrake.
Do I need to change the brake fluid when replacing the pads?
There is no direct need, but if the fluid has been changed a long time ago (more than 2 years), it is recommended to update it. When the pistons are pressed in, the fluid level in the reservoir rises, which can lead to leakage if the reservoir is full of old fluid.
Why do you hear a squeaking sound after replacing the pads?
Creaking can occur due to a lack of lubrication at the contact points between the pads and the caliper, the installation of low-quality parts, or the presence of dirt on the working surface. It is also possible that the pads have not yet broken in.
Is it possible to drive with a new set of pads right away?
Yes, but for the first 200-300 km you need to avoid sharp braking to allow the pads to get used to the disc. This will ensure maximum braking performance in the future.
What to do if the handbrake does not hold after replacement?
Most likely, the parking brake mechanism is not adjusted correctly. You will need to adjust the cable tension or clearance inside the caliper. In some cases, it is necessary to replace worn elements of the handbrake mechanism.