Why not just check the discs?
First, check that the bearings are tight.
Then, put the car on four stands with all wheels in the air. Take off the
wheels and put back on three of the wheel bolts (or nuts). Spin the disk
while holding a stick of some kind against it, supported on a block or
something. You will soon see if the disk is warped. Then, if you have a
dial, you can accurately measure the warpage.
But, beware, loose bearings can lead to pulsation as well as warping.
And, as Julian said, wrong torque on the wheel bolts can do it.
My pulsating brakes took a long time to smoke out. First I found that the
rear right disc was warped. Took it off, put it in a lathe and took off
1/10 mm on both sides. Good as new. But pulsation continued. In the end
I had checked all discs twice.
Two weeks later I did a repack of the front left wheel-bearing. When I
took the hub off, I found that the hub seal was letting out some grease,
which got distributed on the inside of the brake disc, and being burned
into a layer of charcoal. Not a pretty sight. Cleaned the disc,
pulsation gone. Next step: Change the seal.
--
Ugo Hu, Oslo, Norway
HDJ100, Auto, AHC, 2001; ex HZJ80
On Mon, 04 Jun 2007 20:16:07 +0200, John Byrne <[Email address removed]>
wrote: