Disk Warpage is common especially if you have gotten them good
and hot a couple of times. My 81 mustang did exactly as you described
as did my Alpine years ago. Having the rotors turned will normally
solve the problem. You said you replaced the disks before. Was that
with NEW rotors or used ones? Used would probably have a warp to them
unless you had them turned first. If you had them turned, the chances
are it's really the rear drums that are causing the problem. This can
be tested just by doing a 10 MPH stop with the E-brake only with light
preasure. If you feel any pulsing, you should have the drums turned,
and the shoes replaced. Both rear drums on my Alpine were warped and
just using the E-brake would make the where turn back and fourth,
although not as aggresively as when the front rotors were warped.
There's nothing like a LBC with fresh brake in all four corners...!!
Rich
> ----------
> From: Anita & Jim Barrett[SMTP:anitabrt@mindspring.com]
> Reply To: Anita & Jim Barrett
> Sent: Monday, July 14, 1997 4:31 PM
> To: tigers@autox.team.net
> Subject: Shimmy
>
> Tiger People,
> My Tiger has developed a shimmy in the front end when I
> apply the brakes fairly firmly. The steering wheel rotates rapidly
> from side to side about 1 to 2 inches under this condition.
> I have done the following and nothing works so far:
> Changed tires and wheels.
> Checked and rechecked the nuts securing the wheels.
> Changed the upper A arm bushings.
> Re- aligned the front end.
> Checked upper and lower ball joints.
> Checked for slop in front suspension and found nothing
> (almost no tire movement when I attempt to shake the tire
> while the tire is off the ground.)
> Checked the slop in the rack and tie rod ends.
> (no abnormal movement noted)
> Spun the hubs with wheels off and no indication of
> warped disks.
> Replaced the Disk Pads.
> Checked the mounting of front cross member.
> ( still welded solid in addition to the four bolts. )
> Checked the shocks, still fairly stiff.
> Disks appear to be smooth except for the outer
> 1/4" which is and always has been rough and rusted.
> (I have had this condition on my Tiger for a long time.)
> I even changed the disks once or twice and apparently
> the disk pads do not meet the outer edge of the disk
> and therefore they rust.
> Very little backlash in steering wheel turn to wheel
> movement.
> Upper brackets supporting A arm appear to be welded
> solid with no movement.
>
> Under non braking conditions the Tiger does not
> shimmy and it tracks streight down the road.
>
> On smooth streets under fairly firm braking the Tiger stops
> streight with hands off tests, but has shimmy.
> On rough streets under fairly firm braking the Tiger seems
> to pull a little to one side or the other, not consistent in
> direction and has shimmy.
>
> Any one have an idea?
> Jim Barrett Tiger II 351C and others
>
>
>
|