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Old 01-30-2010, 03:33 PM   #1
sonnyb
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Slight shudder under braking

I could do with some opinons on this please. I had not driven my car for about three weeks until this weekend, meaning it had stood throughout the cold weather. When I drove it for the first time the brake seemed to bind on the disc and there was initially quite a judder under braking. I went for a long-ish drive (20 miles) and it improved and smoothed out the vibration quite quickly, but there is still some slight shudder when I brake. Could the extreme cold have caused this? Could the discs be warped even though they were totally fine before? Can discs warp while stationary? Could it just be the pads needing replacing?
Opinions appreciated.
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Old 01-30-2010, 03:36 PM   #2
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I doubt it would be the pads, try and get your disks machined, its a cheap thing to do, and even if its not the culprit it helps your brake performance, is your wheel shaking while braking? If so i believe it would be your disks.
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Old 01-30-2010, 05:00 PM   #3
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Before I'd buy anything, OP, I'd give your brakes a good using. First, I'd use them some more and check rotors for any visible rust...bet you still have some and that's all you're noticing. I mostly use threshold braking so go harder for less time and that's worked well for me.

Also, test for front bearing just to be safe...probably not that. Are you getting any vibration when moving?

If nothing from bearings, then search how to 'bed your pads' and try that.

Finally, significant cold temps may have caused pistons to bind so search how to take care of them.

At the point you have to grind down rotors to get some more miles out of them, get them measured for usable mileage left after getting ground down...might not be worth the expense. Also, make sure your calipers are aligned properly and tight.... If none of that works, then get new rotors and pads and get them hand tightened with torque wrench, not an air gun!

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Old 01-30-2010, 06:00 PM   #4
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Also check your Front control arm bushing; I got the same issue before now everything good after I replace them.
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Old 01-30-2010, 07:12 PM   #5
matt330coupe
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you could have warped your rotors depending how hard you brake normally. my mom actually did this to her caddy sts
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Old 01-30-2010, 07:14 PM   #6
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all on target. quick fix ! hold brake pedal down gently whilest driving on 100 mtrs .
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Old 01-30-2010, 09:47 PM   #7
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You might have a sticky front brake caliper. If your steering wheel is shaking, pull over and check each front wheel for excessive heat. Put your hand near, but do not touch the wheel as it will be really hot. You may also notice the wheel with the sticky caliper will be dirtier with brake dust than the good one. The calipers can get sticky when not used in a few weeks especially if parked when wet or in a humid environment.
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Old 01-31-2010, 11:10 AM   #8
sonnyb
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Thanks for all your help and replies so far guys.
The wheel does not shake under braking, all I can sense is a slight shudder from the brake pedal, but only when braking from above say, 30mph.
I should probably do as suggested and drive/brake some more, but at this time of the year I only use the car very occasionally so it does stand a lot through winter.
The car itself has only covered 35,000, and I am not a hard braker.
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Old 04-30-2010, 12:22 PM   #9
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I have the same problem as the OP - I had vibration after leaving it parked during the melting/freezing time of winter, and subsequently had the control arm bushings replaced (didn't fix it) and the rotors replaced (fixed it). 1 year later (a month ago) - I am have that problem again - the dealer wouldn't replace them under warrantee as they have uneven deposits...

Did the 60-5 mph (bedding) breaking procedure work to eliminate your vibration? I am wondering what is the best way to work off the deposits... I've seen recommendations for "bedding" and for to just apply them lightly for a while at high speeds...

Any insight would be appreciated!
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Old 04-30-2010, 12:32 PM   #10
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Quote:
Originally Posted by dmax View Post
Before I'd buy anything, OP, I'd give your brakes a good using. First, I'd use them some more and check rotors for any visible rust...bet you still have some and that's all you're noticing. I mostly use threshold braking so go harder for less time and that's worked well for me.

Also, test for front bearing just to be safe...probably not that. Are you getting any vibration when moving?

If nothing from bearings, then search how to 'bed your pads' and try that.

Finally, significant cold temps may have caused pistons to bind so search how to take care of them.

At the point you have to grind down rotors to get some more miles out of them, get them measured for usable mileage left after getting ground down...might not be worth the expense. Also, make sure your calipers are aligned properly and tight.... If none of that works, then get new rotors and pads and get them hand tightened with torque wrench, not an air gun!

GL

HTH

Doug
this.
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Old 04-30-2010, 07:44 PM   #11
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Quote:
Originally Posted by sharp330Ci View Post
I have the same problem as the OP - I had vibration after leaving it parked during the melting/freezing time of winter, and subsequently had the control arm bushings replaced (didn't fix it) and the rotors replaced (fixed it). 1 year later (a month ago) - I am have that problem again - the dealer wouldn't replace them under warrantee as they have uneven deposits...

Did the 60-5 mph (bedding) breaking procedure work to eliminate your vibration? I am wondering what is the best way to work off the deposits... I've seen recommendations for "bedding" and for to just apply them lightly for a while at high speeds...

Any insight would be appreciated!
Another thing that probably won't help is to remove your wheels and tighten them up properly...I went through 3 sets of rotors in a year with my '92 E36...all under warranty! I have strong beliefs it's some combination of air gun pressure, corrosion inside wheel not removed...or something causing excessive binding on one side of rotor more than the other...I'm thinking guide pins might do with a cleaning/lubrication. I thought my calipers were due for a rebuild, but they're fine...and I'm sure they're original and they're at 200K...seals going on soon probably!

Also, I read a long time ago that threshold braking is best to use...gives rotors the most time to cool off...so I usually stab pretty late and 'hardish'...of course, doing so well behind other cars so they don't freak.
I don't believe all I've read, but I've driven like this for years with no issues.

Bedding...or maybe just 'waiting' through this period might help...but you certainly would speed it up by being harder on your brakes...and read up on bedding well...coz you have to brake hard from 60 a few times...and then drive on without brakes to let them cool properly...read up on the details...

You might also be feeling some wobbling from pads having shimmied a bit on the rotor like I know mine did...and were catching the lip of rotor. I miked them and they're fine...so that eventually wore away...maybe in a month.

Okay...full disclosure, I'm not a mechanic but have done what I've said.
I'd wait on confirmation from someone who knows what they're talking about...also, more info the better you know...but don't forget the basics too...rinse off brakes really well when cool...check torque on lugnuts...look at and measure rotors/pads (oh, sorry, all newish!)

Try bedding...if no, try lubricating guide pins and using brake cleaner all around...like around piston too if you're not removing them.

You test to see if something is binding? 20 mins. at high speed without using brakes...maybe 10 would do it...pull over without using brakes much, then stick fingers on rotor...count how long you can hold without burning. You can touch the inside disk from the top of rotor. If one side a lot hotter than the other...sticking issue...or, like with me, just a little more heat coz of rubbing on the lip.

Oh, btw, the caliper mounting bracket is held on by two 1/2" bolts (maybe 10 mm) torqued to 80 lb-ft in the front. You shouldn't be nice to them...use them hard, get them bedded and rust free!
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