Brakes

A forum for lovers of Infiniti's hot-rod crossover, the FX! In 2014, all FX models will be named Infiniti QX70, in line with Infiniti's new naming structure.
bigb56
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Joined: Thu Dec 29, 2011 8:26 pm
Car: 2008 FX 35 RWD

Brakes

Postby bigb56 » Fri Oct 13, 2017 9:07 pm

Time for front brake pads on my 08, does anyone know if the rotors are serviceable or does Infiniti just say replace only? This will be her first set of pads, only at 39K on the odometer.


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AZhitman
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Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 73 240Z, 77 620 SR20, 89 Pao, 98 S14, 12 Titan CC 4x4.
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Re: Brakes

Postby AZhitman » Fri Oct 13, 2017 11:00 pm

Rotors can certainly be turned if needed. However, if they're not unevenly worn, there's no real need to mess with them - Give them a good cleaning with brake cleaner, install the new pads, clean and grease the pins / sliders, and perform the "brake bedding" procedure as designated by the pad manufacturer.

EdBwoy
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Re: Brakes

Postby EdBwoy » Fri Oct 13, 2017 11:06 pm

My general rule is to replace, rather than pay the money to resurface.
Most manufacturers, do however state a minimum thickness of the rotors. They usually suggest replacing at that point. I doubt 39K miles with one set of pads will get your rotors to that point.

To that point, if your brakes are not warped (vibration when braking), then I see no point in taking extra material from the discs.

To the flipside, if your rotors are warped, the defects are usually deeper than the surface. Resurfacing/ grinding the rotors will make them dimensionally even, but physically they are likely to result in shaking when braking again. They are cheap enough and last long enough that I don't spending for my safety if I'm in doubt.

bigb56
Posts: 26
Joined: Thu Dec 29, 2011 8:26 pm
Car: 2008 FX 35 RWD

Re: Brakes

Postby bigb56 » Sat Oct 14, 2017 7:39 am

OK thanks guys. I'll check the runout and thickness first. On my 87 Mercedes it is not recommended to re-surface rotors, just replace which is why I wondered about the Infiniti.

AZhitman I spend a lot of time in Surprise, Pop lives there.

bigb56
Posts: 26
Joined: Thu Dec 29, 2011 8:26 pm
Car: 2008 FX 35 RWD

Follow Up

Postby bigb56 » Sat Oct 14, 2017 3:10 pm

My left side rotor had runout very close to the service limit of .0016 and the right had barely .0005 and both were less than .001 under in thickness at approx 1.329 each. So I kept them both. I used Bendix premium ceramic pads, new grease on the slide pins and bled out fluid to refresh. The brakes now feel a lot better and the pedal is higher. The pedal was getting too much travel making it hard to brake without nose diving, although the pads were not yet at the service limit and the wear sensors had not yet contacted the rotors. I don't fully understand that as it seems like as the pads wear the pistons stay further out making up for pedal travel, but none the less there is definitely less pedal travel and you can feel braking begin very early in the pedal making it easy to make a smooth stop without nose diving. There was also a faint rumble when making a low speed panic stop which is now gone as well.

As a side note the new retaining clips that came with the Bendix pads were too narrow to fit over my rotors so I used the old ones.

When I was finished I took a look at the rears and was surprised to see they were looking thin as well. I am used to vehicles using up front pads 2 to 3 times before the rears. So I went back and picked up rear pads and will put them on next weekend, hoping to further improve pedal travel. They certainly are much smaller than the fronts.

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AZhitman
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Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 73 240Z, 77 620 SR20, 89 Pao, 98 S14, 12 Titan CC 4x4.
Location: Surprise, Arizona
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Re: Brakes

Postby AZhitman » Sat Oct 14, 2017 6:24 pm

Nicely done sir!

If Pops is a car guy, I probably know him. :)

bigb56
Posts: 26
Joined: Thu Dec 29, 2011 8:26 pm
Car: 2008 FX 35 RWD

Re: Brakes

Postby bigb56 » Sat Oct 14, 2017 8:19 pm

well....er he's not exactly a car guy. He drives one of those big Crown Vics you see clogging up the left lanes and lining the all parking lots on seniors shopping day in Sun City. I'm the only one in the family that had any interest wrenching.

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AZhitman
Administrator
Posts: 69475
Joined: Mon Apr 29, 2002 2:04 am
Car: 72 240Z RB25, 63 Bluebird RHD, 63 NL320, 67 WRL411, 67 SPL311, 68 510 SR, 73 240Z, 77 620 SR20, 89 Pao, 98 S14, 12 Titan CC 4x4.
Location: Surprise, Arizona
Contact:

Re: Brakes

Postby AZhitman » Sat Oct 14, 2017 8:51 pm

Hahaha, awesome. In that case, he's probably flipped me off in my Z06. :)


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