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insalled new rotor, pad and caliper now wheel is too tight

515 414 June 11, 2017 at 06:04 PM
Installed new rear pad, rotor and caliper on my altima and the wheel is too tight. there is no space between the pads and rotor at all. took car for spin the wheel is getting hot.
Note: did the same on the rear passenger side no, such issue.
It is a remanufactured caliper from autozone, rotor/pad from advanced auto (a slickdeal find)

Any clues?
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Joined Dec 2005
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dealgate
06-13-2017 at 06:38 AM.
06-13-2017 at 06:38 AM.
It is the caliper. The rotor cannot warp that is a myth. The caliper is bad and sticking.

FYI: I assume you opened the brake fluid reservoir before starting?
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zzyzzx
06-13-2017 at 06:43 AM.
06-13-2017 at 06:43 AM.
Quote from GlobWarmNoGood :
could the rebuilt caliper have little less spaces inside to hold the pads? wondering on the same lines.
i was able to close the caliper without much of a problem. (i had iinitially put the pad with wear indicator on outside and outside one inside. But then i could not close caliper. realized the issue and reversed the pads and was able to close the caliper). then tightened the 14mm bolt.

rear passenger side pads, rotor and caliper was replaced a month ago, no issues. this time did the same on rear driver side. i purchased 2 sets of pads, rotors and rebuilt calipers.
OK, so you did everything the same on both sides, including buying everything at the same time (and presumably the replacement calipers were an exact match for the originals, or not). If everything was a match I would tend to blame the rebuilt caliper, but the first thing I would do is take it apart and push (or screw) the piston back and put it all back together and see if that makes a difference. If it doesn't then I suspect that you got a bad rebuild, unless you are having an issue with your hand brake (you maybe should check to see if that needs to be loosened a bit).
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stufine
06-13-2017 at 11:12 AM.
06-13-2017 at 11:12 AM.
Quote from dealgate :
It is the caliper. The rotor cannot warp that is a myth. The caliper is bad and sticking.

FYI: I assume you opened the brake fluid reservoir before starting?
You're saying warped rotors are a myth
or in his case, his new rotor couldn't be warped?
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Rebound
06-13-2017 at 01:21 PM.
06-13-2017 at 01:21 PM.
When you install new brake pads, you should open the brake fluid reservoir and press the brake pistons back into the caliper. In some cars, you need to use a tool to turn the piston into the caliper; you can't simply press it. Check to see if your car needs a special tool to press the pistons into the calipers.

Yes, the new rotors could be warped, but it's more likely that, if you haven't pressed the pistons into the calipers, that's your problem. Don't forget to put the cap back on the brake fluid reservoir when you're done, then start the engine and pump the brake pedal to seat the pistons against your new pads.

IMPORTANT: Since you pushed the pistons out, you MUST pump the brakes, or you will have no brakes when you first drive. This can be very dangerous, so be sure to pump the brake pedal with the engine running before driving.
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Last edited by Rebound June 13, 2017 at 01:44 PM.
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Dr. J
06-13-2017 at 01:35 PM.
06-13-2017 at 01:35 PM.
Quote from dealgate :
It is the caliper. The rotor cannot warp that is a myth. The caliper is bad and sticking.

FYI: I assume you opened the brake fluid reservoir before starting?

I assumed OP did - otherwise installing new pads and getting the assy onto the rotor would basically be impossible! I know when I need to change pads, the piston in the caliper needs to be bottomed out before the assy will go on the rotor - so far back I'm often afraid the gasket will get torn.
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Original Poster
GlobWarmNoGood
06-13-2017 at 09:00 PM.
06-13-2017 at 09:00 PM.
All, thanks a lot for the inputs!!, will rep.

As per suggestion, took apart everything in an attempt to redo (new caliper). in the process noticed something the
caliper opening where the pads and rotor fits is not opening wide enough as if something is stuck.
when caliper clam shell was closed wheels were spinning. the moment the sliding pins were tightened, wheel wont spin.

Took the poor old caliper, gave it some TLC and installed it, bled the break again and now no issues. Wheel is rotating and stops when applied break (car is still on jack). Could not finish all the way today, have to install the tires and drive tomorrow.

Conclusion so far: Something wrong with the caliper Frown. Will be returned to autozone.
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dealgate
06-14-2017 at 03:58 AM.
06-14-2017 at 03:58 AM.
Quote from stufine :
You're saying warped rotors are a myth
or in his case, his new rotor couldn't be warped?
I am saying it is a myth that ANY rotors warp. They do not. No rotor anywhere has ever warped. It is physically impossible.
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larrymoencurly
06-15-2017 at 05:28 PM.
06-15-2017 at 05:28 PM.
Quote from dealgate :
I am saying it is a myth that ANY rotors warp. They do not. No rotor anywhere has ever warped. It is physically impossible.
Then why do factory manuals say rotors can warp and instruct mechanics to inspect them for runout, which is warpage?

Why do non-ABS disks sometimes shudder or pulsate during stops? Why has that problem sometimes disappeared when the lug nuts were loosened and retorqued?
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dealgate
06-16-2017 at 04:06 AM.
06-16-2017 at 04:06 AM.
Quote from larrymoencurly :
Then why do factory manuals say rotors can warp and instruct mechanics to inspect them for runout, which is warpage?

Why do non-ABS disks sometimes shudder or pulsate during stops? Why has that problem sometimes disappeared when the lug nuts were loosened and retorqued?
You can believe what you want but it is a myth pure and simple and the fact that it is impossible is basic physics. There are plenty of sites that will explain it just do a google search.

FYI: Shudder/judder and pulsating happen due to uneven brake pad material transfer onto the rotor due to incorrect braking technique. When rotors are "turned" it is to fix grooves in the rotors from the pads.
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Mike A.
06-16-2017 at 06:43 PM.
06-16-2017 at 06:43 PM.
Quote from dealgate :
You can believe what you want but it is a myth pure and simple and the fact that it is impossible is basic physics. There are plenty of sites that will explain it just do a google search.

FYI: Shudder/judder and pulsating happen due to uneven brake pad material transfer onto the rotor due to incorrect braking technique. When rotors are "turned" it is to fix grooves in the rotors from the pads.
And they're virtually all based on misreading a single source that has been passed down long enough to become "Internet truth." Specifically, an article written by Carroll Smith as copied here:

http://www.stoptech.com/technical...ther-myths

People have taken it to say, as you have here, that there is never, no way, no how, any way that a rotor can be "warped." That's not what he says and not the case. Which is why he specifically conditions his statement in a number of ways and goes on to describe various other conditions and failures which may be found:.

Quote :
With one qualifier, presuming that the hub and wheel flange are flat and in good condition and that the wheel bolts or hat mounting hardware is in good condition, installed correctly and tightened uniformly and in the correct order to the recommended torque specification, in more than 40 years of professional racing, including the Shelby/Ford GT 40s – one of the most intense brake development program in history - I have never seen a warped brake disc. I have seen lots of cracked discs, (FIGURE 1) discs that had turned into shallow cones at operating temperature because they were mounted rigidly to their attachment bells or top hats, (FIGURE 2) a few where the friction surface had collapsed in the area between straight radial interior vanes, (FIGURE 3) and an untold number of discs with pad material unevenly deposited on the friction surfaces - sometimes visible and more often not. (FIGURE 4)
Anyone who has run a brake lathe for any time likely has seen "warped" or distorted or however you want to characterize out-of-parallel rotors. I've seen some that were bad enough to wobble when placed on a counter. In addition to various other manufacturing defects, grossly uneven wear, accidental damage, etc. Rotors are not machined primarily to remove grooves but rather to resurface the face and to square any run-out which even in thousandths of degrees may be felt as pulsing, vibration, grabbing,or "warping" as commonly interpreted by drivers.

He's obviously right that pad deposition is much more common and often mistakenly referred to as "warping." But he does not say that warping never can or never does happen.
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Last edited by Mike A. June 16, 2017 at 06:51 PM.
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larrymoencurly
06-23-2017 at 03:41 PM.
06-23-2017 at 03:41 PM.
Quote from dealgate :
You can believe what you want
No, I can't.

Quote from dealgate :
but it is a myth pure and simple and the fact that it is impossible is basic physics. There are plenty of sites that will explain it just do a google search.
"You can look it up" is a response that completely kills credibility. Provide authoritative evidence for your claim, right here. All you had to do was cite the first Google result I found, which seems to support your claim.

Quote from dealgate :
FYI: Shudder/judder and pulsating happen due to uneven brake pad material transfer onto the rotor due to incorrect braking technique.
Using the most incorrect technique possible on brakes that had already been seated, I've slammed the pedal on some non-ABS cars, but they still stopped straight and steadily, with no pulsation or shudder, probably because there were no warps in the rotors.

Quote from dealgate :
When rotors are "turned" it is to fix grooves in the rotors from the pads.
Among other things. Factory manuals also mention taper and warp.
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