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Old 02-14-2013, 11:35 PM   #1 (permalink)
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Lotus Evora - brake pad rattles (not suspension)

Here I was trying to track down a subtle rattle from the right-front over the last few months, thinking it was suspension-related.

Coarse surfaces, sharp-edge bumps - rattle, rattle. Bloody annoying!

And today, I realised that light braking almost eliminates the noise. What a numpty


It's coming apart tomorrow to see what's up with it.
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Old 02-15-2013, 07:26 AM   #2 (permalink)
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Quote:
Originally Posted by hifiandmtb View Post
Here I was trying to track down a subtle rattle from the right-front over the last few months, thinking it was suspension-related.

Coarse surfaces, sharp-edge bumps - rattle, rattle. Bloody annoying!

And today, I realised that light braking almost eliminates the noise. What a numpty

Evora Brake Pad Rattle - YouTube

It's coming apart tomorrow to see what's up with it.
Well that is not good. I hope you find out what that is.
Ron
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Old 02-16-2013, 04:58 PM   #3 (permalink)
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Quote:
Originally Posted by hifiandmtb View Post
Here I was trying to track down a subtle rattle from the right-front over the last few months, thinking it was suspension-related.

Coarse surfaces, sharp-edge bumps - rattle, rattle. Bloody annoying!

And today, I realised that light braking almost eliminates the noise. What a numpty

Evora Brake Pad Rattle - YouTube

It's coming apart tomorrow to see what's up with it.
Brake pad rattle can be caused by several things:

1. Knock Back, from a warped or irregular brake rotor/disc, that bumps the pads back as it rotates. Check your rotor run out with a dial indicator, and if it is over .005"-.010", turn or replace the rotors.

2. Suck Back, from sticking seals on the caliper pistons. With the car sitting still, push the brake pedal and release it, then check if the pads still rattle. The cure is greasing the piston seals with caliper specific seal grease.

3. Pad taper, caused by the caliper flexing open under extreme pressure and heat conditions, usually associated with track use. The pads will be worn at the heals, near the outer diameter, and will rattle more there, and little at the edge near the center hub. The solution is to replace the pads, or sand them to even thickness all across the pad surface if they are not too worn. Then, get more air to the discs, and consider changing to a higher heat rated pad.
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Old 02-16-2013, 10:55 PM   #4 (permalink)
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You forgot broken anti-rattle springs.

I think that's more likely to be the issue. I've decided not to fix this myself & let the dealership sort it out. I know I'm not the only one out there with ridiculously annoying suspension rattles. I want them to see this issue for themselves & work out how to fix it for everyone.
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Old 02-24-2013, 12:57 AM   #5 (permalink)
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Car back from the dealership - was a snapped anti-rattle spring. But as they didn't have one in stock & knew I needed the car back that day, they used that goo to stick the pad to the piston.

Rattle fixed, suspension properly quiet now. Thank goodness!
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Old 02-24-2013, 06:18 AM   #6 (permalink)
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Is the broken spring something that one could see with the wheel off?
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Old 02-25-2013, 01:25 AM   #7 (permalink)
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Dunno - possibly!

But as per my video, you should *not* be able to rattle the pad like that ;-)
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Old 02-25-2013, 06:58 PM   #8 (permalink)
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Is the broken spring something that one could see with the wheel off?
Part # 09 is the "Clip, Anti Rattle".
You should be able to see it at the outer edge of the caliper with the wheel off.
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