Question : THE suspension of my 1999
Toyota Harrier "thumps" each time
I go over a speedbump. My friends
have advised me to change the
shock absorbers, but I do not want
to spend money and not solve the
thumping problem. Please advise if
this is indeed the correct thing to do
or should I have other components
checked out beforehand.
Answer : Although shock absorbers do fail
after high mileages, they usually
squeak and rarely "thump" and in
most cases of failure on oil-gas type
shock absorbers such as those fitted
to the Toyota Harrier, oil leaks are commonly seen on absorbers that
The most common causes of
thumps are broken upper shock
absorber mountings, although worn ball joints such as suspension and steering
joints cannot be ruled out.
Joint failures usually give a knocking noise instead of a thump, and if
the joint is seriously worn, the knocking noise can be heard if the vehicle is
rocked while at standstill.
The slack can be seen when the
joint is levered. Unfortunately, you
can only check for a broken top suspension mount by dismantling the
entire suspension system.