Lil_Chef

as some may know i have recently put Baer brakes on my car with their 14" slotted/drilled rotors on the front.

starting about a week ago i have noticed that on off ramps when i apply about medium braking pressure i feel a little bit of a shimmy in the steering wheel. i dont notice anything at low speed braking, and at hard pressure i dont notice anything either.

i have put about 2,000 miles on my car since the install and i havent gone through a formal bedding process for the brakes either (Baer said to wait about 1000 miles on their zinc coated rotors before doing so). could not bedding the pads in be the problem? or is it definitely the rotors.

2cokeman

Shimmy?? Or is it a pulsation? Pulsation is for sure the rotors

Lil_Chef

if i let go of the steering wheel while braking it "shakes" left and right.

2cokeman

Sounds like rotors to me?

pascal

Yep, what he said.^^^^

Cal26Stang

that's a sure sign of bad rotors...get yo money back

Argonaut

Before blaming it on cheap rotors bed the pads properly. What pads are you using by the way? Uneven pad deposits can absolutely cause brake judder. Stranger things have happened I suppose but unless its a manuf defect I find it impossible to believe you warped the rotors in 2K of street driving (now if you did a track day with them...that might be a different story).

Lil_Chef

no track day on them yet, thats next week. ill go bed them in tonight but i have an appointment later tomorrow to resurface them (rears are definitely warped from a track day). In the front i have what ever pads that Baer uses, and i have the stock pads in the rear. i was hoping the rears would last longer but it looks like ill have to get some 2-piecers for them too.

would it be possible to warp them in 2k miles if my dad, for some reason, felt the need to engage ABS within 100 miles of the install? he wanted a fun test drive before i went home..... i would think that the effects would have shown up sooner.

Argonaut

Like I said previously, any thing is possible but baring a manufacturing defect, warping the rotors in 2K miles is very unlikely. I've put thousands of miles of extreme usage on various cars. Summit Point and Thunderbolt are just brutal on brakes. In all that time I have never warped a rotor (cracked lots of them though). It is most likely something else. Uneven pad deposits are very common and this is actually the culprit when most people assume they have a warped rotor. There are other possibilities also - you have radial calipers. They are not as forgiving as the stock slide-rails. Your calipers need to be perfectly aligned with the rotors (pefectly square), if they are off more than 1-2 thousands then you could have issues. Check that the rotor is properly seated on the hub also. You can take a wheel off and then make sure the rotor is seated with two lug nuts. Then rig something up to hold a pencil or pointer rock steady next to the rotor, almost touching. Spin the rotor and see for yourself if there is any runout.

Boondoggie

+1

I would remove the rotors, and check the hub mating surface, maybe even go over with a scotchbrite pad to make sure nothing is interfering with the rotor mounting up perfectly true.