Brake Shudder
Thread Starter
Melting Slicks
Joined: Sep 2002
Posts: 2,329
Likes: 0
Brake Shudder
Put new pads and rotors on 2000 C5 -done this before - seated the brakes by going to 60mph braking down to slow but not stop, then repeat. Did this about 7 times when I got brake shudder. Went up to 60 mph and braked and got wheel shudder again. Any ideas what the problem is? Done rotors and pads on vette, cadillac and old cutlass.
Melting Slicks
Joined: Aug 2004
Posts: 2,052
Likes: 20
From: boston mass
1: new rotor may not be true, take they back and have the shop test they for warps.
2: make sure the base is cleaned before installing rotors, may have a bump or high spot stopping the rotor from going all the way back.
2: make sure the base is cleaned before installing rotors, may have a bump or high spot stopping the rotor from going all the way back.
Instructor
Joined: May 2005
Posts: 146
Likes: 13
From: San Jose CA
Do you have a way to test for runout with the rotors on the car? A dial indicator with a magnetic base?
I have to echo the idea from trammac, did you clean the hub surface? When I did mine, I noticed that there was quite a bit of paint (from the original rotors) left on the hub. Only a few mm thick, but that can affect it.
With new rotors, you can pretty much rule out hard spots (from deposits of pad material.)
One last idea; overtightening the lug nuts has caused problems with rotors. I'm assuming you did this job yourself, did you use an impact wrench to put the lug nuts back on? When my first set of tires were replaced, I had a similar problem; turned out the tire shop used an impact wrench and overtightened. The happy ending was that once I loosened and torqued the lug nuts, the rotor was not permanently affected.
Good luck.
Craig
I have to echo the idea from trammac, did you clean the hub surface? When I did mine, I noticed that there was quite a bit of paint (from the original rotors) left on the hub. Only a few mm thick, but that can affect it.
With new rotors, you can pretty much rule out hard spots (from deposits of pad material.)
One last idea; overtightening the lug nuts has caused problems with rotors. I'm assuming you did this job yourself, did you use an impact wrench to put the lug nuts back on? When my first set of tires were replaced, I had a similar problem; turned out the tire shop used an impact wrench and overtightened. The happy ending was that once I loosened and torqued the lug nuts, the rotor was not permanently affected.
Good luck.
Craig
Thread Starter
Melting Slicks
Joined: Sep 2002
Posts: 2,329
Likes: 0
I will take apart and clean thoroughly and check for problems. I torqued the lug nuts myself to 100 ft/lbs -did not over power the lugs. Thanks to all -I will reply if problem is found. New "wear" pattern on the other three rotors was concentric to center of the wheel. On one (left front) the pattern was in all directions.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
When you get on the brakes they do shutter. It is called ABS. Most ppl dont know what it is and think there is something wrong.
Other possibilties are bent calipers. Caliper bolts not tight.
New rotors are not the issue.
Other possibilties are bent calipers. Caliper bolts not tight.
New rotors are not the issue.
