shakes when I break

J

Jerseyj

Yeah, it rhymes and I didn't even start out doing that *grin*....

My '99 Forrester has been just wonderful...however, over the last month
or two I've noticed whe breaking at times (mid-speed, higher than 15 ,
lower than 55) there is a distinct shake in the steering wheel....

Allignment ? Something else ?
 
There is a very good chance that your front rotors have become warped.
Two of my older Subarus had developed this syndrome, as heat
dissapation seems to be a problem for Soobs. If it turns out this is
the problem, I would recommend investing in a set of slotted/
cross-drilled rotors.

Does this sound reasonable to others?...Carl1luckytexan?
 
j said:
There is a very good chance that your front rotors have become warped.
Two of my older Subarus had developed this syndrome, as heat
dissapation seems to be a problem for Soobs. If it turns out this is
the problem, I would recommend investing in a set of slotted/
cross-drilled rotors.

Does this sound reasonable to others?...Carl1luckytexan?

That is probably the problem. I have had it happen on several cars over the
years. New rotors is better than turned ones.

Don D.
 
.... I’ve noticed when breaking at times (mid-speed, higher than
15 ,
lower than 55) there is a distinct shake in the steering wheel....

I had a similar problem with my 95 Impreza, replaced the front rotors
and the problem went away.

A friend suggested that the warping was caused by "coming to a stop,
thus heating the brake discs, then standing with the brakes applied,
allowing most of the disc to cool without allowing the site of the pad
to cool." He recommended stopping, shifting into neutral, and
standing without the brakes until the light turns green. It might be
a possiblity, I don’t have the patience to try it.
 
j said:
There is a very good chance that your front rotors have become warped.
Two of my older Subarus had developed this syndrome, as heat
dissapation seems to be a problem for Soobs. If it turns out this is
the problem, I would recommend investing in a set of slotted/
cross-drilled rotors.

Does this sound reasonable to others?...Carl1luckytexan?

Yes, it does. I have also found bad tires to cause the same thing. The
difference is often whether or not the tires are getting 'old' (not so
much in wear - but in years too.) 'Warped' rotors are also likely to be
felt as a pulsation in the brake pedal. THAT is very likely to be warped
rotors. Since you have a '99, you tires can't really be 'old', so unless
you have tires that are getting worn, have never been rotated, etc.
,you probably need to have the rotors turned or replaced. In an effort
to keep unsprung weight to a minimun, nowadays rotors are somewhat less
'beefy' and if they have been turned before you may need new ones. Also,
some folks have reported that, severely heated/warped rotors are likely
to go bad again after being turned. I would probably opt for an entire
brake rebuild with new rotors. If you want a little higher performance,
get slotted rotors. Factory replacemnets will likely give you the
quietest and most durable combination of rotor/pads. After markets like
stoptech, brembo, Axxis, EBC ,etc. are good too - but may be noisy or
decrease rotor life and are more for 'track' or high performance
driving. Stoptech has some interesting reading on 'warped' rotors at
their website that corresponds to what another post mentioned about
applying the brakes and holding them following a hard stop.
http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml

Bottom line - most likely rotors - most likely the fronts.

Carl
1 Lucky Texan
 
Front brakes. If there's enough metal left, you can have the rotors
ground for a nominal cost. On a '99 my guess is that you'll need new
rotors -- probably about $300-$400 at dealer.
 
lkreh said:
Front brakes. If there's enough metal left, you can have the rotors
ground for a nominal cost. On a '99 my guess is that you'll need new
rotors -- probably about $300-$400 at dealer.

You can find aftermarket rotors for far less than that, every bit as good
as the oem rotors.
 
Yeah, it rhymes and I didn't even start out doing that *grin*....

My '99 Forrester has been just wonderful...however, over the last month
or two I've noticed whe breaking at times (mid-speed, higher than 15 ,
lower than 55) there is a distinct shake in the steering wheel....

Allignment ? Something else ?

This is likely to have one of two causes:

1) Unbalanced wheels caused by tire wear or mud/debris lodged inside the wheel.

2) Subaru OEM brake pads use an organic binder that will cook out and deposit on
the rotors after a full stop from high speed. Resurfacing or replacing the
rotors will work until the next time the brakes are heated up. Aftermarket
performance pads (I use Hawk street Performance Pads) can fix the problem and
improve the brake feel.

I had assumed the pulsing was due to warped rotors and got very frustrated after
getting them turned several times, only to have the problem reappear. I had
also assumed that the mushy, vague feel was due to hoses and/or calipers, but
the change with good pads was a night vs. day difference.
 
Jerseyj said:
Yeah, it rhymes and I didn't even start out doing that *grin*....

My '99 Forrester has been just wonderful...however, over the last month
or two I've noticed whe breaking at times (mid-speed, higher than 15 ,
lower than 55) there is a distinct shake in the steering wheel....

Allignment ? Something else ?

Thanks everyone for your comments and advice.
 
Thanks everyone for your comments and advice.

This has also been a recurring problem with my '97 legacy. My
question is:
Is is a safety issue or just annoying because of the feel?
 
Jerseyj said:
Yeah, it rhymes and I didn't even start out doing that *grin*....

My '99 Forrester has been just wonderful...however, over the last month
or two I've noticed whe breaking at times (mid-speed, higher than 15 ,
lower than 55) there is a distinct shake in the steering wheel....

Allignment ? Something else ?

Loosen and then torque all the lugnuts equally with a good torque wrench
before you buy new rotors.
 
Jerseyj said:
Yeah, it rhymes and I didn't even start out doing that *grin*....

My '99 Forrester has been just wonderful...however, over the last month
or two I've noticed whe breaking at times (mid-speed, higher than 15 ,
lower than 55) there is a distinct shake in the steering wheel....

Allignment ? Something else ?

Someone posted an excellent article about his *MOST* modern-day rotor
"warping" is actually caused by cementite deposits on the rotors caused by
crappy heat dissipation since we're not making pads from asbestos anymore.

The best way to deal with this is apparently to make sure that the pads,
after a particularly rough braking session, aren't allowed to cool while
pressed against the same section of rotor for a prolonged period of time
(like at a stop light.)

--
 

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