2002-2009 Nissan 350z Brake Caliper Problems and Replacement

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most Nissan 350Z caliper complaints come down to three things: sliding calipers on non-Brembo cars whose guide pins seize and wear the inner pad early, fixed Brembo calipers whose piston seals and dust boots age and let pistons drag, and owners ordering the wrong parts because the car has one of two very different brake systems. Identify which system your Z has first, diagnose from the pad wear pattern, then decide between cleaning and rebuilding the hardware or replacing the caliper.

Which Brakes Does Your 350Z Have?

Every 350Z uses power-assisted vented disc brakes at all four corners with 4-wheel ABS, Brake Assist and Electronic Brake force Distribution, according to Nissan's own press kits. What changes by trim is the caliper. Nissan fitted Brembo brakes to the higher trims: the 2005 press kit lists Brembo as standard on the Coupe Track model and the Roadster Grand Touring, and the 2007 kit lists them on the Grand Touring Coupe and Roadster and on the NISMO 350Z. Nissan describes that package as four-piston front and two-piston rear calipers with larger pads and larger rotors, and quotes 12.8-inch front and 12.7-inch rear rotors on the NISMO car.

Base, Enthusiast and Touring cars use the standard system with sliding calipers instead. The quick check is at the wheel: Brembo calipers are painted, carry the Brembo name and have pistons on both sides of the rotor. A standard caliper has its piston only on the inboard side and slides on pins.

That last row matters more than anything else in this guide. Our listings, such as the Hawk DTC-60 front pads for 350Z with Brembo brakes and the Hawk HP Plus rear pads for 350Z without Brembo, state which system they fit in the title. Match that before you order.

How the Two Caliper Designs Work, and Why They Fail Differently

Brembo's technical explanation of caliper design sums it up well. In a floating caliper, the piston pushes the inner pad directly against the rotor, and the outer pad is pulled in by the caliper body sliding on its guides. In a fixed caliper, the body is bolted rigidly in place and pistons on opposite sides squeeze both pads. Fixed calipers are generally aluminum alloy and stiffer, which is why they give better pedal feel and more even pad wear. Floating calipers are usually cast iron, cheaper and more compact.

Both designs depend on the square piston seal. Brembo notes the seal does two jobs: it keeps the fluid in, and it rolls the piston back slightly when you release the pedal so the pads stop touching the rotor. The dust boot keeps dirt and moisture off the piston so it does not corrode. When a seal hardens or a boot tears, the piston stops retracting cleanly, and that is where drag starts.

On a standard 350Z caliper the weak point is usually the slide. Guide pins live in heat, water and road salt; once the pin boots split, corrosion builds until the caliper cannot float. On a Brembo car there is nothing to slide, so the failures are almost always seals, boots and pistons, which is why a stuck Brembo usually shows up as uneven wear between the inner and outer pads or across one pad rather than a caliper that will not move.

Symptoms and How to Diagnose Them

• Pull to one side under braking. One caliper is applying harder or later than the other. Check both sides of the same axle.
• Drag, heat and a burning smell after a drive. Carefully compare wheel temperature side to side after a normal drive. A noticeably hotter wheel is holding its pads against the rotor.
• Inner pad worn much thinner than the outer. The classic sign of seized guide pins on a sliding caliper: the piston keeps pressing the inner pad while the outer pad never fully engages.
• Tapered pad wear. When one guide pin seizes and the other still moves, the pad wears at an angle.
• Vibration or a pulsing pedal. Constant drag overheats the rotor and leaves uneven deposits, which feels like a warped rotor.
• Fluid on the inside of the wheel or a dropping reservoir. A leaking piston seal. Park the car and fix it before driving further.

To confirm it, lift the car, spin each wheel by hand and compare how freely each one turns. Then pull the pads and read them. On a standard caliper, remove the guide pins: if they will not slide out or come out rusted and dry, you have found the cause. On a Brembo caliper, look at each piston's dust boot and check that the pads move freely in the caliper and that no piston is left extended further than its neighbors.

Repair or Replace?

If the problem is guide pins or rusty pad abutments on a standard caliper, you may not need a caliper at all. Clean the pin bores, replace the pins and boots if they are pitted or torn, clean the bracket rails and lubricate with a synthetic brake lubricant that is safe for rubber. Petroleum grease swells the rubber boots and makes the problem come back. A brake hardware kit gives you fresh clips and pins for this job.

Replace the caliper when a piston is corroded or seized in its bore, a seal is leaking, or the bleeder is broken off. Calipers should be done in pairs on the same axle so both sides apply with equal force. For standard-brake cars, a loaded remanufactured caliper is the usual fix; browse replacement brake calipers and match the part to your trim and axle. Brembo calipers are costly to replace new, so many owners have them resealed with new piston seals and boots instead; that is a clean-bench job, and cutting corners on it means another leak.

What to Replace at the Same Time

• Pads. Pads contaminated with fluid, or heat-glazed from dragging, will not recover. Fit new pads on both sides of the axle; see brake pads.
• Rotors. A dragging caliper usually overheats the rotor. If it is scored, blued or pulsing, replace it. For Brembo cars we carry options such as the DBA 4000 T3 front slotted rotor for Brembo-equipped 350Z and the GiroDisc 2-piece front rotors for track use.
• Brake hoses. An old flexible hose can collapse internally and trap pressure at the caliper, which mimics a stuck piston. If a caliper releases once you crack the bleeder, suspect the hose. See brake hoses.
• Brake fluid. Opening the system means bleeding it. Use the fluid type printed on the reservoir cap and in the owner's manual, from a sealed container.

How Hard Is the Job?

Swapping a standard sliding caliper is a moderate DIY job with basic hand tools, a flare-nut wrench for the hose fitting and a helper or bleeder for the bleed. Brembo calipers bolt on the same way but a reseal is best left to someone with the right tools and a clean bench. Either way, torque the caliper and bracket bolts to the value in the factory service manual, bleed until the fluid runs free of air, and bed in the new pads before hard driving. If the pedal is soft or low after the job, do not drive the car until it is fixed.

Frequently Asked Questions

How do I know if my 350Z has Brembo brakes?

Look through the wheel. Brembo calipers are painted, carry the Brembo name and have pistons on both sides of the rotor. Nissan's press kits list Brembo on the Track, Grand Touring and NISMO trims depending on the year.

Can I put Brembo pads on a non-Brembo 350Z?

No. The pad shapes and rotor sizes are different between the two systems. Order parts that name your system in the fitment.

Why is my inner brake pad worn out but the outer one is fine?

On a standard sliding caliper that almost always means seized guide pins. The caliper cannot float, so only the piston side does the braking.

Do I need to replace both calipers?

Replace calipers in pairs on the same axle so both sides apply evenly. The other axle can stay if its calipers are healthy.

Can I rebuild Brembo calipers instead of replacing them?

Yes, resealing with new piston seals and dust boots is common, as long as the pistons and bores are not pitted. A corroded bore means replacement.

Sources

1. Nissan USA - 2007 350Z Coupe and Roadster Press Kit - Brembo on Grand Touring and NISMO, four-piston front and two-piston rear, NISMO rotor sizes, ABS with EBD and Brake Assist
2. Nissan USA - 2005 350Z Coupe Press Kit - vented four-wheel discs on all trims, Brembo standard on Track coupe and Roadster Grand Touring
3. Brembo - Differences between fixed and floating brake calipers - how fixed and floating calipers work, materials, seal roll-back and dust boot function
4. Free ASE Study Guides - Sticking brake caliper guide pins - seized pins cause inner pad wear, tapered wear, pull and drag; use synthetic brake lubricant, not petroleum