05-06-2019, 09:20 PM | #1 |
Enlisted Member
9
Rep 46
Posts |
Car Shudders Under Breaking 40-70mph
I would like to preface this post by saying i have tried to look for other posts regarding this issue unsuccessfully.
Also, all 4 rotors, pads, and sensors, have been replaced 3000 miles ago on my BMW 435i XDrive 2014. The car and my brakes have not been on a racetrack or seen speeds above 80mph. No heavy braking that can cause any sort of heat cycles. My brakes shudder more or less depending on the speed, more speed more shaking. less speed less shaking, under 40mph i dont even notice it at all but towards 60 the car vibrates. I have been chasing this issue for a while and I am very confused as to what this issue could be. Brake lines? something with my calipers? Thanks for your time guys. Much appreciated. |
05-06-2019, 09:46 PM | #2 |
Captain
644
Rep 847
Posts |
start reading
https://www.brakeandfrontend.com/warped-rotors-myth/ eta i bet you had hot brakes, held the pads against the rotors and now have pad build up on the rotors in one section. |
Appreciate
0
|
05-06-2019, 09:51 PM | #4 |
Lieutenant
299
Rep 479
Posts |
Try clearing the discs of any pad deposits. A couple runs down the highway worked for me. Had the same issue as you after brake job. Get up to 70 to 80 mph and brake in a moderate manner as to not engage abs slow down to 30 or 20 mph and speed back up. Give the rotors time to cool between passes. I am not a professional but this method worked for me.
|
Appreciate
0
|
05-06-2019, 09:53 PM | #5 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
05-06-2019, 09:54 PM | #6 |
Enlisted Member
9
Rep 46
Posts |
I have 51.5K miles although this is a fairly new issue. I had everything replaced (rotors pads sensors) less than 3k miles ago but i have been chasing the issue since i hit th 43k mile mark.
|
Appreciate
0
|
05-06-2019, 09:56 PM | #7 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
05-06-2019, 09:58 PM | #8 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
05-06-2019, 09:58 PM | #9 | ||
Lieutenant
299
Rep 479
Posts |
Quote:
|
||
Appreciate
0
|
05-06-2019, 10:04 PM | #10 | |
Lieutenant Colonel
828
Rep 1,933
Posts |
Quote:
Would seem advisable check runout on the disks and inspect the pads, and it could be case of uneven pad material deposited on rotor surface- if the pads/rotors check OK then examining the thrust arm rubber fluid filled bushings seems logical next step. Good luck/Bill |
|
Appreciate
0
|
05-06-2019, 10:17 PM | #11 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
05-06-2019, 10:20 PM | #12 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
05-06-2019, 10:29 PM | #13 | ||
Lieutenant Colonel
828
Rep 1,933
Posts |
Quote:
Improper bedding of the brakes can give you uneven material deposits on rotor surface- double check those brakes- |
||
Appreciate
0
|
05-06-2019, 10:46 PM | #14 |
Enlisted Member
9
Rep 46
Posts |
will do, thank you
|
Appreciate
0
|
05-07-2019, 01:03 PM | #15 |
Lieutenant
83
Rep 552
Posts |
When you say shudder. Is this only when you are braking?
If it is warped rotors you will feel feedback in the pedal. It shouldn't shake the car. I swapped my rotors and pads and they started to warped fairly soon. But they stopped after a while of normal use. |
Appreciate
0
|
05-08-2019, 01:09 AM | #16 |
Enlisted Member
9
Rep 46
Posts |
The actual car vibrates, yes, which led me to change my rear rotors, whihc did not solve the issue still.
|
Appreciate
0
|
05-08-2019, 07:10 AM | #17 |
Yoda of mods
1691
Rep 3,003
Posts
Drives: X5 RWD
Join Date: Feb 2018
Location: NC
|
Get the thrust arms checked.
__________________
Current: 2020 Explorer ST (Agate Black Metallic) AWD, F15 SGM RWD
F87 AW (retired) F30 SBM 316rwhp/440rwtq (retired) Follow me on Twitter: https://twitter.com/EdwyerCLT YT: https://www.youtube.com/@DWYERGARAGE/videos |
Appreciate
0
|
05-08-2019, 08:52 PM | #19 |
Major General
1838
Rep 5,171
Posts |
If you brake harder is it fine? Two things with the brakes can cause this:
1) Need to bed the brakes (it will show up with light braking as shudders). 2) They got grease/oil on the pad when it was installed. Backwards to belief, the pads grab the rotor causing shutters as well. |
Appreciate
0
|
05-08-2019, 09:12 PM | #20 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
05-08-2019, 09:23 PM | #21 |
First Lieutenant
109
Rep 367
Posts |
Bed the brakes in...
Unless you've been tracking your car you'll never get them hot enough to warp the steel discs, most likely you've got paid deposits on the disc itself Also, check suspension components and those all important black rubber circles that stick you to the tarmac |
Appreciate
0
|
05-08-2019, 09:26 PM | #22 | |
Enlisted Member
9
Rep 46
Posts |
Quote:
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
Tags |
brakes, warped rotors |
|
|