I know there drilled and slotted but I dont track mine......
Vibration when braking at low speeds
Thread Starter
Intermediate
Joined: Jul 2007
Posts: 29
Likes: 0
From: San Antonio Tx
Vibration when braking at low speeds
Hello,
Well I just purchased my first vette. After years of dreaming. 99 with about 73k on it. Overall it's in good condition but has a few issues I could use some help with.
When braking, at low speeds 15mph or so I get a vibration. It's not in the pedal. No vibration at any other time. It's not really a vibration exactly, but more like the brakes are catching and releasing, not fast like abs but much more spaced out...even causing the car to almost surge (also similar to a separated tire but it's only on braking slow speeds). If I get hard on the brakes in a quick stop, I don't notice it. If I heat the brakes up, it seems to settle it a bit for a while. Now, my first instinct is the rotors are warped. But usually you would feel this in the pedal. Which I don't...I have never owned a car with rear disc brakes before so I am not sure the impact of warped rotors on the rear. I have also noted the parking brake does not hold. I don't know if that is a correlation or not. If anyone has any tips or been there done that, I would appreciate your input.
Thanks a bunch!!!
Well I just purchased my first vette. After years of dreaming. 99 with about 73k on it. Overall it's in good condition but has a few issues I could use some help with.
When braking, at low speeds 15mph or so I get a vibration. It's not in the pedal. No vibration at any other time. It's not really a vibration exactly, but more like the brakes are catching and releasing, not fast like abs but much more spaced out...even causing the car to almost surge (also similar to a separated tire but it's only on braking slow speeds). If I get hard on the brakes in a quick stop, I don't notice it. If I heat the brakes up, it seems to settle it a bit for a while. Now, my first instinct is the rotors are warped. But usually you would feel this in the pedal. Which I don't...I have never owned a car with rear disc brakes before so I am not sure the impact of warped rotors on the rear. I have also noted the parking brake does not hold. I don't know if that is a correlation or not. If anyone has any tips or been there done that, I would appreciate your input.
Thanks a bunch!!!
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Ah, the classic uneven brake pad material - pulsating brakes syndrome. Here's what I did to eliminate it forever:
http://forums.corvetteforum.com/show....php?t=1410305
Perhaps changing the pad material would help, but I wanted a solution that did NOT require
a) Bedding the brakes to an exact 5-step procedure
b) Limiting my brake pad selection to only certain types
http://forums.corvetteforum.com/show....php?t=1410305
Perhaps changing the pad material would help, but I wanted a solution that did NOT require
a) Bedding the brakes to an exact 5-step procedure
b) Limiting my brake pad selection to only certain types
Safety Car
Joined: Jul 2006
Posts: 4,325
Likes: 0
From: You can't get there from here NJ
St. Jude Donor '08-'09
Ah, the classic uneven brake pad material - pulsating brakes syndrome. Here's what I did to eliminate it forever:
http://forums.corvetteforum.com/show....php?t=1410305
Perhaps changing the pad material would help, but I wanted a solution that did NOT require
a) Bedding the brakes to an exact 5-step procedure
b) Limiting my brake pad selection to only certain types
http://forums.corvetteforum.com/show....php?t=1410305
Perhaps changing the pad material would help, but I wanted a solution that did NOT require
a) Bedding the brakes to an exact 5-step procedure
b) Limiting my brake pad selection to only certain types
I had the same issue with my vette when I got it. I had the brake rotors resurfaced, and it took care of the problem temporarily. It is back again, after a year, so I am switching to drilled and slotted rotors.I don't track the car so it isn't a question for me about the rotors. I'm also trying GM ceramic pads I'm getting from Gene at GM Parts. Just waiting for the pads to come in so I can make the complete changeover. The answer though, is pad material on your rotors. There are lots of posts on rotors, so you might want to do a search to get some more info on this to make a choice if you want to get slotted, drilled and slotted, dimpled, or just plain NAPA ones for about $25. Good luck.
Melting Slicks
Joined: Nov 2005
Posts: 2,071
Likes: 0
From: clackamas oregon
try the hard braking as spoke of earlier. it does work most of the time. do not come to a complete stop till the brakes have time to cool after the procedures though. mine did this occasionaly with drilled and slotted rotors and ceramic pads. people tend to stomp on the brakes in these cars a little more than a normal sedan so the brakes tend to get more of this uneven pad transfer on them from the heat and pressure generated.
Burning Brakes
Joined: Oct 2004
Posts: 931
Likes: 35
From: Rowlett, Texas
Just an observation; I've had several cars that had warped rotors, and I never had one that made the pedal pulsate. You could feel it in the wheel, or the car body, but never in the brake pedal. New rotors always fixed it.
DG
DG
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Ah, the classic uneven brake pad material - pulsating brakes syndrome. Here's what I did to eliminate it forever:
http://forums.corvetteforum.com/show....php?t=1410305
Perhaps changing the pad material would help, but I wanted a solution that did NOT require
a) Bedding the brakes to an exact 5-step procedure
b) Limiting my brake pad selection to only certain types
http://forums.corvetteforum.com/show....php?t=1410305
Perhaps changing the pad material would help, but I wanted a solution that did NOT require
a) Bedding the brakes to an exact 5-step procedure
b) Limiting my brake pad selection to only certain types
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Thanks, Lonestar,
I really like every other characteristic of the GM pads - just not the adhesion of material to flat rotors. The slots in my PowerSlot rotors not only keep the pulsations away, but they also keep the pads fresh, especially when it comes to low-mileage cars that often allow glazing of the pads to form.
Dave
I really like every other characteristic of the GM pads - just not the adhesion of material to flat rotors. The slots in my PowerSlot rotors not only keep the pulsations away, but they also keep the pads fresh, especially when it comes to low-mileage cars that often allow glazing of the pads to form.
Dave
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Racer
Joined: Jul 2006
Posts: 480
Likes: 17
From: Wichita KS
I had a interesting problem with brake pulsation on my 04 Z06. I put on a set of drilled and slotted rotors and shortly there after I picked up a vibration on slow speed braking just before coming to a complete stop. I lived with it for a while thinking that I did not seat them properly or that they were warped. Well I finally got pi**** and bought a new set. When we were replacing them we ran into a problem on removing the drivers rear rotor it would NOT come off! Well we finally got it off and found the emergency brake shoes had come off their mounts!! Long story short we reassembled them put on new rotors and no vibration. A friend in the club bought the first set and installed and has no vibration at all with the first set. So before replacing or turning your rotors check your emergency brake shoes on BOTH sides.
Jim
Jim
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Thanks, Lonestar,
I really like every other characteristic of the GM pads - just not the adhesion of material to flat rotors. The slots in my PowerSlot rotors not only keep the pulsations away, but they also keep the pads fresh, especially when it comes to low-mileage cars that often allow glazing of the pads to form.
Dave
I really like every other characteristic of the GM pads - just not the adhesion of material to flat rotors. The slots in my PowerSlot rotors not only keep the pulsations away, but they also keep the pads fresh, especially when it comes to low-mileage cars that often allow glazing of the pads to form.
Dave
