Originally Posted by ishootstuf

it feels just like warped rotors, but i put new front rotors on - not turned, but new. The shaking doesn't happen when i brake just using the e-brake, nor does it shake when i downshift or just let off the gas. I don't feel any slop in the rack or hub bearings on all 4 wheels. The u-joints feel ok too. No clunking heard from the lca's either. I don't get it. Also, the car needs to warm up for a few minutes before it starts to have the issue, in other words, it takes a couple of stops before the problem presents itself.

Any suggestions? I searched and found possibly abs module so i'll pull the fuse(s) for that.

This is the 93 sc400 i just bought for my daughter.

Originally Posted by dani

I do think that one caliper is siezed. See on this dual br calipers the one of the piston doeas not go back in and i would recomend to check you brake hoses to make sure that they are free of obstructions.

Originally Posted by dani

so the wheels are spining freely.

Originally Posted by dani

well i need to know at what speed you get the pulsation, hot-cold brakes, no brake etc.

Originally Posted by ishootstuf

No change after new pads. It's not tires. It shook before I bought new tires. I didn't buy cheap rotors. In addition, I put the original rotors from the SC400 on my GS300 and it does not shake. The old rotors are slightly warped, but the GS did not exhibit the same symptoms as the SC400. I'm going to try swapping the wheels off my other SC, maybe one or more are bent.

So in short, new rotors, pads, and tires - no change in behavior. Sux...

Originally Posted by NoLongerA13bFan

Did you replace the rear rotors?

Originally Posted by ishootstuf

It feels just like warped rotors, but I put new front rotors on - not turned, but new. The shaking doesn't happen when I brake just using the e-brake, nor does it shake when I downshift or just let off the gas. I don't feel any slop in the rack or hub bearings on all 4 wheels. The u-joints feel OK too. No clunking heard from the LCA's either. I don't get it. Also, the car needs to warm up for a few minutes before it starts to have the issue, in other words, it takes a couple of stops before the problem presents itself.

Any suggestions? I searched and found possibly ABS module so I'll pull the fuse(s) for that.

This is the 93 SC400 I just bought for my daughter.

Originally Posted by ishootstuf

It's not the rear rotors. The vibration does not happen when stopping using only the e-brake.

Originally Posted by NoLongerA13bFan

Like I said before the the Ebrake acts on the housed in the hub section of the rotor so if the rotor is warped applying the ebrake does not act on the warped part of the disc (rotor face).