Brake problem? [with picture]

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Apr 21, 2010 | 09:43 PM

RespondsWithGif

Thread Starter

Drifting

Joined: Sep 2007

Posts: 1,442

Likes: 1

Brake problem? [with picture]

Brakes are a little jittery. Did some hard stops and now I see this. What am I seeing here?

Apr 21, 2010 | 10:02 PM

cobra3

Racer

Joined: Nov 2008

Posts: 251

Likes: 1

From: Pensacola Florida

what kind of pads are you using

Apr 21, 2010 | 10:05 PM

RespondsWithGif

Thread Starter

Drifting

Joined: Sep 2007

Posts: 1,442

Likes: 1

Quote:

Originally Posted by cobra3

what kind of pads are you using

No clue. They are the same ones I got when I bought the car a little over 2 years ago. They do feel like they fade pretty easy. Maybe ceramic?

Apr 21, 2010 | 10:10 PM

deJong

7th Gear

Joined: Apr 2010

Posts: 7

Likes: 0

rotors could be warped. Had this problem earlier this year and it was the rotors. Saturday morning and a brake job later all is fine.

Apr 21, 2010 | 10:11 PM

postwhore

Burning Brakes

Joined: Feb 2010

Posts: 761

Likes: 1

From: sunnyvale ca

they are hot spots
mine come and go
I never worried about them
is your pedal pulsing ?
How much pad you got left ?

Apr 21, 2010 | 10:36 PM

RespondsWithGif

Thread Starter

Drifting

Joined: Sep 2007

Posts: 1,442

Likes: 1

Quote:

Originally Posted by postwhore

they are hot spots
mine come and go
I never worried about them
is your pedal pulsing ?
How much pad you got left ?

It doesn't really pulse that bad if at all. It does, however, do this lurching kind of thing below 20mph under braking. One time the pedal was pulsing real bad but I did a few hard stops and it fixed itself. That was months ago. Now I'm seeing this.

Not sure how much pad is left now but looked fine 4 or so months ago.

Apr 21, 2010 | 11:38 PM

postwhore

Burning Brakes

Joined: Feb 2010

Posts: 761

Likes: 1

From: sunnyvale ca

I'd check the pads and if they are still good, drive it

Apr 22, 2010 | 12:51 PM

Chris_B

Racer

Joined: Oct 2009

Posts: 252

Likes: 2

Quote:

Originally Posted by 01silvercoupe

Brakes are a little jittery. Did some hard stops and now I see this. What am I seeing here?

This is one of the classic symptoms of uneven pad transfer layer deposits, sometimes referred to as "heat checking". If not too severe, it is sometimes cured by re-bedding the brakes. If that doesn't do it, your pads probably have some glazing (the resin binders that "glue" all the pad compound components together has melted and left the surface shiny instead of dull).

If glazed, they must be sanded down to a smooth, dull finish and re-bedded. The best method at home is to use a sheet of 120 grit sandpaper laid down on a flat surface. Oscillate the pad face down until the glazing is removed.

Since the caliper is already out of the way, scrub both sides of each rotor with either Scotch-Brite (a lot of work) or a Flex-Hone (easy as pie). Do not use sandpaper as it removes iron and makes it virtually impossible to keep the surface flat by hand.

Chris