Snrub

I'm experiencing a strange issue. I changed my brake pads, performed the beading procedure and I now have a intermittent, fairly severe vibration under braking.

If I'm driving around the issue will occur when I apply the brakes with light to medium pressure. If I stomp harder on the brakes, the problem goes away for a while. 5 mins later the issue returns. The caliper and pads seems to slide back and forth with ease.

Any ideas?

alnielsen

iTrader: (4)

The same thing happens on my son's 300zx. I haven't really looked into it.
Did you have the brake rotors turned? There could be a buildup of the old pad left on the rotor.

kevinande

You may not have done the beading procedure correctly?

Snrub

I didn't turn the rotors, but they seemed pretty smooth and they didn't have too much use on them. I'll try the beading procedure tonight again and update. I'm pretty confident that I did it correctly the first time...

moliver

iTrader: (1)

What kinda brake pads?

Sounds like what I experience when I overheated the brake pads on the track.

Wonder if you were too aggressive in your bedding?

Snrub

Hawk HP+. It was wet out when I did it. I thought I was within the range of the instructions, but I suppose it's possible...

godesshunter

Why not just buy new rotors?

tpb7463

iTrader: (1)

The vibration is the pad getting "kicked" off the rotor either from warping or incorrect assembly. You can easily tell if a rotor is warped by looking for uneven contact "sheen". If your rotors look OK, then double check your assembly torques, your calipers may have simply come loose during break-in.

djfa

iTrader: (3)

You may have slightly warped rotors. I always change mine with the break pads

Snrub

I did the bedding process again. It didn't help. I'm always suspicious of the top caliper pins with their rubber lining. I tried swapping it out with a bottom pin (ie. two bottoms). Didn't help. Then I did a track day. The problem appears to solved. I'm not exactly certain why, but I think I'm okay with it.

I didn't replace the rotors because they're expensive in Canada. I think I will make a point of having them resurfaced next time.

Thanks for all of the responses.

TANKERG

Aren't the bottom pins supposed to have the rubber lining?

Snrub

You are correct, I had mine in the wrong position. I don't really understand the purpose of the rubber linings...

TANKERG

Me neither. I hope someone can point that out and why do the rears not have them, unless it has something to do with the fronts compress and the rears twist.

Grace_Excel

iTrader: (5)

Doesn't mention anything about the rubber lining, but here's a very informative post you should take time to read: BRAKE FAQ