Campbell45

okay this is really hard to explain but on my 2000 Camaro Z28 when I hit brakes it feels like the brakes a grabing and then letting go. you can also hear it as if its grabing and letting go. im not sure if its a bearing, mybe its rotors on brakes, or its the brake pads. Its not very loud but you can hear it. this is only when i hit the brakes. its not exactly jerky it does move you back and forth when you hit the brake. any ideas? sorry I cant really explain it

MyShibbyZ28

Probably a warped rotor. LS1 brakes are known for warping rotors easily. Get the rotors turned, or replaced.

mzgp5x

Maybe a wheel sensor. You can pull fuse to disable and TS. Also, check Vac brake booster for seal/ check valve and pressure. Should hold vac for 3 minutes minimum. Assemble a clamp or wire tie on the vac hose (manifld and check valve). Sometimes the vac hose will leak. I have similar brake problem, but, I have low vacuum due to FI application. I am currently trying to solve. A mechanical manifold vac gage works good while your driving. From data I have, 16" Hg is usually a minimum to enable brake pressure for panic stops. My brake pedal gets soft (max vac & max brakeing), then feels hard (loss of brake vac assist). Hope this helps. B.

ws6transam

Well, as a long-term F-body owner (seventeen years with the same car), I can hold a white envelope up to my head and say "Mmmmmm....rubber brake lines......"

Unless you change the brake fluid regularly, as in every couple of years, you can expect about a seven year life from the rubber lines before they start to rot from moisture in the fluid, then chafe inside and restrict brake fluid. The symptom is that when you stab your brakes, the car darts quickly to one side, then straightens out. Sometimes it'll dart the opposite direction when getting off the brakes, too!

This happened to me when my car was seven years old, and again at age fourteen. Then at age sixteen, "Excitement" got braided stainless steel lines with teflon liners. Now it's seven years later but I keep changing out the fluid every other season and the problem hasn't returned.

Campbell45

i really think its the rotors

Z28luvr

^yeah, what he said......wouldn't hurt to change the fluid also. How do your pads look? It could be your ABS engaging. It's been my experience on my car that when my pads get real low, the ABS will kick in more times than not.

Greed4Speed

Always change your fluid when you do a brake job.

ws6transam

I guess if you really think it's rotors, you have two choices:

1) Go buy new rotors and hope it's really rotors.

2) Get a magnetic dial indicator and use it to check runout on the rotor. It shouldn't be much more than .004" . Then use your micrometer to check thickness at six equidistant locations around the rotor to look for collapse. Width shouldn't vary by much more than a couple thousandths.

Campbell45

hmm new rotors.....mybe go a whole new brake setup like wilwood's! yeah..lol