Braking Vibration
#16
Burning Brakes
Thread Starter
#17
Rennlist Member
No it's very irregular and will change with brake temperature. A warped disk will tend to be present at all times and just get worse with speed.
#18
Burning Brakes
Thread Starter
#20
Nordschleife Master
Out of interest, do you feel the vibration through the brake pedal at the same time as the steering wheel vibrates?
#21
Burning Brakes
Thread Starter
OK just thought I'd mention it as I know a few people had feared the worst only to find out that they had forgot to torque the nuts up after removing a wheel.
Out of interest, do you feel the vibration through the brake pedal at the same time as the steering wheel vibrates?
Out of interest, do you feel the vibration through the brake pedal at the same time as the steering wheel vibrates?
#22
Rennlist Member
I would jack up the front and check the wheel bearings: grab the tire at 12&6 and wobble for play, you should have virtually none. If you do turn the tire to 3&9 ad do the same, having someone hold the steering wheel firmly. If you get a significant difference look to worn suspension parts. If all is well back to the brakes.
First check the runout of the disks, pull the pads, a dial guage against the surface is the right way but in a pinch setting a screwdriver against the disk on the caliper or an immovable base (jack stand bottle jack etc) rotate the disk and feel for a continuous rubbing. If you get variations most likely you will need a surfacing. Check the inner outer and middles of both sides.
If they aren't warped and lacking Kais set of aggressive pads to scrub the rotors the next thing to do is pull it apart and take the rotors to be surfaced...
Then careful follow the pad mfgr process for bedding to minimize the potential for it happening again.
First check the runout of the disks, pull the pads, a dial guage against the surface is the right way but in a pinch setting a screwdriver against the disk on the caliper or an immovable base (jack stand bottle jack etc) rotate the disk and feel for a continuous rubbing. If you get variations most likely you will need a surfacing. Check the inner outer and middles of both sides.
If they aren't warped and lacking Kais set of aggressive pads to scrub the rotors the next thing to do is pull it apart and take the rotors to be surfaced...
Then careful follow the pad mfgr process for bedding to minimize the potential for it happening again.
#23
#25
Burning Brakes
Thread Starter
#26
Technical Guru
Rennlist Member
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#27
Race Car
#28
Three Wheelin'
#29
Rennlist Member
#30
Instructor
Join Date: Mar 2009
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I had bad vibration from the front end which started in Spa with disc approaching 1000 miles old and pads the same. The vibration got worse the more laps I did (the hotter the brakes got). For road use the vibration was noticeable but not excessive.
Did another track day - same pattern as Spa, got worse the longer I used them.
Got the brake discs skimmed (on the car) and never a problem again.
Hope that helps a little with your diagnosis.
Did another track day - same pattern as Spa, got worse the longer I used them.
Got the brake discs skimmed (on the car) and never a problem again.
Hope that helps a little with your diagnosis.