2003-2005 Infiniti G35 Brake Job Guide: Symptoms, Costs and the Right Parts

By Core Brake Parts Tech Team — Circleville, OH warehouse

A brake job on a 2003-2005 Infiniti G35 means pads and, usually, rotors on four-wheel disc brakes, but the single most important step is figuring out which of three different brake systems your car has. Infiniti used different front calipers depending on year, drivetrain and package, and pads or rotors for one setup will not fit the others. Identify the caliper first, then buy parts.

Three Brake Systems on One Nameplate

The first-generation G35 sedan and coupe is a rear-wheel-drive car, with an all-wheel-drive G35x sedan added for 2004. Infiniti's own maintenance data lists three drivetrain and transmission variants for 2004 alone: RWD automatic, RWD manual, and the AWD G35x. The brakes split along similar lines, and fitment data shows it clearly:

The trap here is the 2005 model year. A 2005 G35x uses the older single-piston front brake, while a 2005 rear-drive G35 uses the newer two-piston setup. Ordering "2005 G35 pads" without specifying RWD or AWD is the most common way owners end up with the wrong box.

To check your car, look through the front wheel spokes. A single-piston caliper slides on pins and has its piston on the inboard side only. A four-piston fixed caliper is a large one-piece unit straddling the rotor, typically painted and branded on the face. The two-piston 2005 caliper is noticeably bulkier than the single-piston unit, with two pistons side by side on the inboard half.

Symptoms That Your G35 Is Due for Brakes

• High-pitched squeal while driving that goes away with the pedal pressed: the metal wear tab on the pad is touching the rotor. This is the built-in warning that the pad is near the end.
• Grinding or scraping: the friction material is gone and the steel backing plate is cutting into the rotor. At this point the rotors are almost certainly damaged and need replacing, not resurfacing.
• Steering wheel shake or a pulsing pedal when stopping from highway speed: rotor thickness variation, often called warped rotors. The G35 is a heavy, powerful car and the fronts take most of the heat on repeated hard stops.
• Pulling to one side: a sticking caliper piston or seized slide pin on the single-piston cars, or a stuck piston on the multi-piston calipers. Check for one wheel noticeably hotter or dirtier with brake dust than the other after a drive.
• Soft or sinking pedal: this is a hydraulic problem (fluid, a leak, a line or the master cylinder), not worn pads. Do not keep driving on it.

One G35-specific item worth knowing: certain 2003 sedans and coupes were recalled because the brake stop lamp switch could malfunction and leave the brake lights dark when the pedal is pressed. The dealer remedy was a replacement switch. If your brake lights work intermittently, check whether that recall was completed on your VIN.

Front vs Rear: What Wears and in What Order

Like most rear-drive sedans, the G35 does the majority of its braking on the front axle, so front pads normally wear out first. The rear brakes are also discs, with a small drum-style parking brake inside the hat of the rear rotor. That matters during a rear job: if the rear rotor will not come off, the parking brake shoes may be holding it, and backing off the adjuster is part of the removal.

Because the performance-package cars use a matching upgraded rear brake, buy the rear parts for the same system you identified up front. Never assume a rear pad set labeled "G35" fits every G35 from these years.

What to Replace Together

Always replace pads as an axle set, both sides at once. On a car this age, the right call is usually pads and rotors together rather than pads alone:

• Rotors: the rotors on a 2003-2005 car have likely been replaced or resurfaced before. Rotors that are under minimum thickness, grooved or causing a pulsation should be replaced. New brake rotors paired with new pads bed in cleanly and avoid a repeat vibration complaint.
• Hardware: the abutment clips and anti-rattle springs lose tension and corrode. A brake hardware kit is inexpensive insurance against noise, especially on the single-piston sliding calipers.
• Calipers: replace a caliper only if a piston is seized, a boot is torn or it leaks. Replacement calipers should be done in pairs on the same axle.
• Fluid: Infiniti's schedule calls for inspecting the brake fluid regularly, as often as every 3,750 miles or 3 months on the more frequent schedule, because fluid absorbs moisture as it ages and moisture reduces braking efficiency and causes corrosion. Use the fluid type printed on the reservoir cap or in the owner's manual; a brake job is a good time for a flush if the fluid is dark.

For pads, a quality ceramic brake pad suits most daily-driven G35s: low dust on the large-spoke wheels and quiet operation. Owners who drive hard or run track days may prefer a more aggressive performance compound, which trades some dust and noise for fade resistance.

How Hard Is a G35 Brake Job?

On the single-piston cars, a pad and rotor swap is a straightforward driveway job: remove the caliper, remove the caliper bracket to free the rotor, clean and lubricate the slide pins, compress the piston and reassemble. On the four-piston and two-piston calipers, pads alone are often simpler because the pads can come out without removing the caliper, but the rotor still requires unbolting the caliper from the knuckle.

Things that make the job harder than it looks:

• Rotors rusted to the hub. Penetrating oil and a few firm blows to the rotor hat usually free them; never hammer on the caliper or near the wheel bearing.
• Rear rotors held by the parking brake shoes, as noted above.
• Caliper and bracket bolts: torque them to the value in the factory service manual and use new or cleaned hardware. Do not guess.

After the job, pump the pedal until it is firm before moving the car, then bed in the new pads with a series of moderate stops from medium speed, avoiding a full stop while the brakes are hot.

What Drives the Cost

The total depends on a few choices: pads only versus pads and rotors, one axle versus both, and whether calipers or a fluid service are needed. The four-piston performance brakes use larger rotors and pads, so parts for those cars generally cost more than for the standard single-piston setup. Doing the work yourself removes labor entirely, and on the standard brakes that is a realistic first brake job for a careful owner. Browse brake pads and complete kits for your exact setup once you know which caliper you have.

Frequently Asked Questions

Do all 2003-2005 Infiniti G35s use the same brake pads?

No. There are three front brake designs: single-piston calipers on 2003-2004 standard RWD cars and the 2004-2005 G35x AWD, four-piston calipers on 2003-2004 RWD cars with the performance package, and two-piston calipers on the 2005 RWD G35. Each needs its own pads and rotors.

Do G35 brakes fit a Nissan 350Z?

Often, yes, because the two cars share a platform. The four-piston G35 brakes share pads with four-piston 350Z models, and the 2005 RWD G35 brakes share fitment with later G35, M35 and M45 models. Always confirm by caliper type, not by model name.

Why does my G35 squeal after new pads?

Common causes are skipped hardware clips, no brake lubricant on the pad contact points, glazed or reused rotors, or pads that were not bedded in. Replacing the hardware and bedding the pads properly fixes most cases.

Should I replace rotors every time I replace pads?

Not automatically, but on a car this age it is usually the right call. If the rotors are below minimum thickness, scored or causing a pulsation, replace them. Resurfacing thin rotors on a heavy car like the G35 tends to bring the vibration back quickly.

Was there a brake recall on the 2003 G35?

Yes. NHTSA campaign 03V200000 covered certain 2003 sedans and coupes whose brake stop lamp switch could malfunction. Dealers replaced the switch.

Sources

1. PowerStop fitment lookup, K2710 - 2003 G35 and 2004 G35 RWD with single-piston front calipers share fitment with the 2004-2005 G35x AWD
2. PowerStop fitment lookup, 16-960 - 2003-2004 G35 RWD models with four-piston front calipers share pads with four-piston 350Z models
3. PowerStop fitment lookup, K114 - 2005-2008 G35 brakes shared with M35/M45 and two-piston 350Z models
4. NHTSA recalls, 2003 Infiniti G35 - campaign 03V200000, brake stop lamp switch replacement
5. INFINITI maintenance schedule, 2004 G35 brake fluid - fluid inspection intervals, moisture absorption, RWD/AWD and manual/automatic variants