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04-09-2014, 02:41 PM | #1 |
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Brakes feel weak
My car is at 60k Miles, and I have recently replaced all 4 brake pads, the rear rotors, and changed the brake fluid. Everything felt good until a few days ago, when I started noticing that the braking power isn't as strong as it used to be. I don't feel that strong initial bite anymore. Could worn front rotors make the brake feel weak, or do you guys think this could be something else like a leak? Thanks.
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04-09-2014, 03:18 PM | #3 |
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Is the pedal firm or going to the floor? If it is firm, then it's most likely your pads and rotors.
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04-09-2014, 03:32 PM | #4 |
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Sounds like you haven't bedded in your new pads to your new rotors. Until the pads have a transfer layer laid down on the rotors, they'll perform noticeably worse. You might also be experiencing "green fade" on your pads since they're brand new, which goes away with general usage.
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04-10-2014, 02:26 AM | #6 | |||
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Stock Pads and rotors I will be taking it in on saturday to replace the front rotors and maybe check the brake fluid. Thanks for the tips everyone.
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///M3 Mods: | Eisenmann Race Exhaust | Primary Cats Delete (TTP) | ESS Tune | 19" Advan RS | Eibach Springs | MS Air Filter | BMW Perf. Spoiler | BMW Perf. Splitters | Euro LCI Tail lights | Angel iBright v.3.0 | 20% Tint | Matte black Kidney Grills | CF Side Gills | Painted Reflectors | Black M3 emblem
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04-10-2014, 11:35 AM | #7 |
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Thin rotors might be a possibility, though I assumed they'd have measured your rotors when swapping out your pads. I'm also not sure what symptoms of a too-thin rotor are. I'd imagine that would just cause an inability to get rid of heat as efficiently, but if that's the case then you'd only see reduced braking power after repeated stops that had put heat into the braking system. Any chance it's getting close to replacement time for your tires? It could be that they're not gripping as well as they'd need to be for maximum braking effect. If tires were the culprit you'd probably have ABS kicking in sooner than usual.
If your pedal isn't going farther down to the floor than usual, brake fluid wouldn't be the culprit. And even you do notice increased pedal travel, if it occurs even before you've put a LOT of heat into the brakes (it'd be very hard to boil even the stock fluid on public roads), then you've probably just got air in the system. Depending on whether the air is in the calipers (from not closing the bleed screw before releasing the pedal during service) or the master cylinder (from letting the reservoir get too low during service) you'll either just need to bleed the brakes or flush the entire system. But it won't be because the fluid is too old or not high performance enough.
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Gone but not forgotten: '11.75 M3 E92 Le Mans | Black Nov w/ Alum | 6MT (owned 5/2011 - 11/2015) Last edited by jphughan; 04-10-2014 at 11:41 AM.. |
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