new brakes 1mm to think? - LotusTalk - The Lotus Cars Community
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post #1 of 18 (permalink) Old 10-26-2017, 01:13 PM Thread Starter
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new brakes 1mm to think?

Changing my brakes tdoay and the new front brakes are a hair too thick. The piston is all the way back, do I have to grind this down?

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post #2 of 18 (permalink) Old 10-26-2017, 01:17 PM
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There might be a lip on your brake rotor outer edge you have to push them past? What brakes are you using? Sold for Lotus application?

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post #3 of 18 (permalink) Old 10-26-2017, 01:53 PM Thread Starter
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yeah for my car, bought at a parts store so maybe not perfect? Back brakes fit great. Ill look for a lip but I reall have to bang on it to get it to move. Not a good feeling about it.

Solar Yellow 07 (225 whp)
Katana 2 SC
Sector 111 Pro rad radiator
Larini SE Exhaust and Lotus Euro Grills
alarm mod ( 80 feet )
all recalls complete.
upgraded front speakers to 5.25, back to 6.5 added a 12 inch sub
AikShii's Glove box.
Nexus gen 2 custom made radio Bessel.
Garw.co Dash.
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post #4 of 18 (permalink) Old 10-26-2017, 02:00 PM
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I wouldn't bang on it. If it's that hard to get on you'll be heavily dragging on the rotors, heating up the breaks and potentially warping the rotors. I'd return them for a bad fit.
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post #5 of 18 (permalink) Old 10-26-2017, 02:15 PM
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You bought brakes at a parts store? Really? For your one of 5000 car and you are surprised they don't fit right?
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post #6 of 18 (permalink) Old 10-26-2017, 02:28 PM
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I wouldn't bang on it. If it's that hard to get on you'll be heavily dragging on the rotors, heating up the breaks and potentially warping the rotors. I'd return them for a bad fit.
Heat doesn't warp rotors. The rotors on a race car may smoke or glow without warping.

The warped feeling is caused by something else:
Uneven wheel lug torque (>5% lug to lug)
Cementite formation
Foreign substance like grease or brake fluid on rotor
Wheel to rotor/hub interface is misaligned
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post #7 of 18 (permalink) Old 10-26-2017, 02:33 PM
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Keep trying and try to swap the pads from one side to another. I had this happen with the last set of pads I purchased, make sure you really have the piston all the way in, even just a hair out can cause this. Also make sure there is not anything on the caliper preventing the pad from sitting all the way against the piston.
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post #8 of 18 (permalink) Old 10-26-2017, 02:34 PM
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Quote:
Originally Posted by ulao View Post
Changing my brakes tdoay and the new front brakes are a hair too thick. The piston is all the way back, do I have to grind this down?
Perhaps you should measure the rotor thickness:
https://www.lotustalk.com/forums/f275...cations-82013/
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post #9 of 18 (permalink) Old 10-26-2017, 03:28 PM
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Originally Posted by Roundabout View Post
Heat doesn't warp rotors. The rotors on a race car may smoke or glow without warping.

The warped feeling is caused by something else:
Uneven wheel lug torque (>5% lug to lug)
Cementite formation
Foreign substance like grease or brake fluid on rotor
Wheel to rotor/hub interface is misaligned
I had an old early 90s Honda Accord that had this weird issue where it would apply the brakes by itself. You could tell by the obvious lack of power, the smell, and the thumping that came from the brakes. They definitely warped due to heat.
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post #10 of 18 (permalink) Old 10-26-2017, 03:42 PM
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Quote:
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I had an old early 90s Honda Accord that had this weird issue where it would apply the brakes by itself. You could tell by the obvious lack of power, the smell, and the thumping that came from the brakes. They definitely warped due to heat.
I very much doubt that.

-Warped- Brake Disc and Other Myths

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post #11 of 18 (permalink) Old 10-26-2017, 03:49 PM Thread Starter
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Front pads needed some rubber mallet encouragement. I think there was a lip. The back side would not fit at all. They didn't cost much so it's not worth returning and back pads worked great. I really need something in this car as one pad is scrapping so ill just use the ok worn down pad for now until I get an OEM pair.

I'm curios though, is turning down a pad a bad idea? Could only imagine the pad would not be level and not make full contact. Plus there may be some uneven girding on there. Or would the brakes eventually ware down correctly?

I have to say, other then this fitting issue, this has been the most pleasant brake job I have ever done.

Solar Yellow 07 (225 whp)
Katana 2 SC
Sector 111 Pro rad radiator
Larini SE Exhaust and Lotus Euro Grills
alarm mod ( 80 feet )
all recalls complete.
upgraded front speakers to 5.25, back to 6.5 added a 12 inch sub
AikShii's Glove box.
Nexus gen 2 custom made radio Bessel.
Garw.co Dash.
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post #12 of 18 (permalink) Old 10-26-2017, 04:00 PM
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Originally Posted by oldmansan View Post
I very much doubt that.

-Warped- Brake Disc and Other Myths

San
Believe it or not, that was my experience and the reason for my comment.
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post #13 of 18 (permalink) Old 10-26-2017, 04:37 PM
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Believe it or not, that was my experience and the reason for my comment.
It is not the heat that warps the rotor, it is how the rotor cools. Uneven cooling or having the rotor in a bind will cause it to warp. This is why on our race cars that we run full floating rotors. It allows the rotors to cool naturally without any binding or external forces applied.

Later,
Eldon
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post #14 of 18 (permalink) Old 10-26-2017, 07:29 PM
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I can't remember if it was the pads for the Viper or a Subaru (or both) which do have the same shape as ours but are a bit thicker than the Lotus pads.
There have been multiple reports in the past about folks encountering the same issue when they accidently purchased the wrong pad.

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post #15 of 18 (permalink) Old 10-27-2017, 04:05 AM
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Order you some Rear brakes from the Nissan GTR and Rear brakes for the Dodge Viper!

EBC Red DP3197/2C
EBC Red DP3885/2C

Perfect fit on my 05 elise no problems going on.
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post #16 of 18 (permalink) Old 10-27-2017, 09:44 AM
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As eluded to above, there's a thicker and thinner version of the pads for the Elige. It's easy to get the wrong ones. Yes, the thinner ones are essentially milled down versions of the thicker ones...

Please give these links a read for pad selection. We carry the best options available for any occasion, IMHO...

Lotus Brake Pad Tech

Complete Braking for the Elige Here

Cheers,

Phil
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post #17 of 18 (permalink) Old 10-27-2017, 09:53 AM
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The warped rotors from heat were maybe due to using the e-brake while the rotors were still hot. If you really heated up the brakes, don't use the e-brake, just leave it in gear and chock the wheels.
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post #18 of 18 (permalink) Old 10-27-2017, 11:24 AM
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Quote:
Originally Posted by SS Lotus Elise View Post
The warped rotors from heat were maybe due to using the e-brake while the rotors were still hot. If you really heated up the brakes, don't use the e-brake, just leave it in gear and chock the wheels.
Even in that case, they are not warped (runout), they only feel warped, because hot pad compound was unevenly transferred to the hot rotor, which caused uneven friction when the car was next driven. This kind of damage can sometimes be worn away, especially by certain pad compounds known for wearing down rotors

For the lurkers, we're not talking street usage of the e-brake, we're talking about coming off the track and setting the e-brake, which is a no-no.
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