Brake Judder only above 40mph! (No reply in 'Brakes'!)
#1
Brake Judder only above 40mph! (No reply in 'Brakes'!)
I posted this in 'Brakes' and no replies there!!
Any clues on what would cause this please?
I thought it was due to my front shocks being shot to bits. Changed those, and the problem is greatly reduced but nevertheless the brakes still make the car judder. The judder is not noticeable below 35-40mph, 40-60mph is pretty awful, and above that not all that noticeable.
Now then.
On a Jack: There is slight side-to-side play in both front wheels, but no more than should be there. There is no vertical play on either wheel.
On the ground: When the car is rocked from side to side there are no noises. When the car is rocked vertically there are no noises.
HELP!
Any clues on what would cause this please?
I thought it was due to my front shocks being shot to bits. Changed those, and the problem is greatly reduced but nevertheless the brakes still make the car judder. The judder is not noticeable below 35-40mph, 40-60mph is pretty awful, and above that not all that noticeable.
Now then.
On a Jack: There is slight side-to-side play in both front wheels, but no more than should be there. There is no vertical play on either wheel.
On the ground: When the car is rocked from side to side there are no noises. When the car is rocked vertically there are no noises.
HELP!
#3
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Warped disc, worn pads or both. Had the exact same problem on my old sti 4. The brakes I had were ebc discs and red stuff pads, both of which were completely shot in within only 6000miles of normal road use.
#5
Mmmm. Come to think of it the judder may have started when I fitted 4 Pots and discs. Pads were new, Mintex. Discs look to be in good condition but were used, only a very small lip on them. Caliper seems to be fine, all 4 pistons moved freely.
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#13
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Sounds like you have slight disc warp...if the steering wheel doesn't shake at all at any speed without the brakes being applied then that confirms the wheel balance is okay. If you've changed the discs and pads, might be worth just checking again to make you you have no rust or crap between the disc and the hub as that can throw things out just a little.
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Chances are it is the disks thou.
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Actually sounds like disc thick/thinned, often mistaken for warping, its where the discs warps slightly hot (they all ahve to unless radial mounted due to the contsraint of the mounting bell) and then after you stop breaking the pads knock the high spots off so some parts of the disc are thicker than others.
Some pads are worse for this than others and I have to say I've found Mintex the worst, most manufacturers who hae this problem (Ford and Rover used to) fix it by using a more abrasive pad that machines the disc back flat under heavier braking.
Simon
Some pads are worse for this than others and I have to say I've found Mintex the worst, most manufacturers who hae this problem (Ford and Rover used to) fix it by using a more abrasive pad that machines the disc back flat under heavier braking.
Simon
#16
Update..
Okay.. This is beginning to sound like I may have multiple problems. The latest is this. I have again jacked the car to have a more detailed look. I'll do my best to explain.
With the front end jacked:
1. When the wheels are moved by hand side-to-side both have play that can be felt with the palm of your hand. Play is behind the disc. Wheel Bearings a bit sloppy? Change them?
2. Also when the wheels are moved from side-to-side (ignore the wheel bearings for now) both sides turn together but with an audible knock at each end of the movement. When this is done there is noticable play between each knock. Could this be the (dare I say it) steering rack fubared?
What do you all think now, could these faults be the cause of the vibration?? How much to repair (I can do the work myself)?
Oh and did I say Bo#locks yet?
Bo#locks!!!
With the front end jacked:
1. When the wheels are moved by hand side-to-side both have play that can be felt with the palm of your hand. Play is behind the disc. Wheel Bearings a bit sloppy? Change them?
2. Also when the wheels are moved from side-to-side (ignore the wheel bearings for now) both sides turn together but with an audible knock at each end of the movement. When this is done there is noticable play between each knock. Could this be the (dare I say it) steering rack fubared?
What do you all think now, could these faults be the cause of the vibration?? How much to repair (I can do the work myself)?
Oh and did I say Bo#locks yet?
Bo#locks!!!
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