Front brake starts to smoke

Tiny
LASTMOH
  • MEMBER
  • 2007 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
I replaced front pads with ceramic pads. I was going down a canyon and half way down the front brake starts to smoke. What can causes that? Is weigh ta possible cause? By the way; rear brakes are drum brakes.
Wednesday, June 17th, 2020 AT 3:38 PM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
If you were going down a long steep grade then this would be normal if you rode the brakes the whole way down until they started smoking.

Basically as you descend a canyon or mountain, you need to pump the brakes and not hold them for long periods. In other words, you brake a little harder for short periods of time, then let let the vehicle cost until you need to slow down again and repeat this. This way the pads and rotors can actually cool down a little bit in between braking.

If you just ride the brakes for a long period, then it heats the rotors up until it actually starts to melt the pads. Once this happens they will actually glaze over and you will not have very good stopping ability and can get into an accident because the rotors become like glass and the pads allow the rotor to slip through it much easier and you take longer to stop.

I would recommend removing the pads and rotors and either replace them or at least scuff them up.

Let me know if you have questions. Thanks
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Wednesday, June 17th, 2020 AT 3:47 PM
Tiny
LASTMOH
  • MEMBER
  • 26 POSTS
The way I was braking is I brake for 3 seconds and release the brakes. I did not ride them. Even with that I smelled them and when I pulled over I saw smoke.
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Wednesday, June 17th, 2020 AT 5:16 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
Ceramic pads can generate more friction than the common semi-metallic brakes depending on the pad type and composition. As such they can also generate more heat during use. Combine that with the front brakes doing more breaking than the rear and your travel downhill increasing the weight on the front and making the brakes work that much harder and you can generate a lot of heat even with stab braking.
However, I would double check that the front brake calipers are sliding properly and that the pistons are releasing, especially as this started right after you installed the new pads. Check the rotors as well for heat related damage.

I would also check on the brand of pads you used, there are a lot of ceramics out there and some are great while others are not so good. See what the reviews are for the pads you have.
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Wednesday, June 17th, 2020 AT 10:44 PM

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