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From: Hachiroku ハチロク on 23 Sep 2009 17:20
On Wed, 23 Sep 2009 09:20:39 -0700, Jeff Strickland wrote:

>
> I'm confused.
>
> Once the rotors warp, they remain warped until they are machined or
> replaced.

This is interesting. I replaced the brakes on my '85 Celica with the
cheapest (spelled "C-H-I-N-A") rotors I could get. At about 15,000 miles I
started getting a pulsating through the pedal. Since I blew out the
cartilige in both knees doing them, I said..."NAH!".

5,000 miles later they stopped pulsating...



From: Jeff Strickland on 23 Sep 2009 17:26

"Hachiroku ????" <Trueno(a)e86.GTS> wrote in message
news:pan.2009.09.23.21.18.08.124947(a)e86.GTS...
>>>
>> Rear Drum brakes self-adjust by using the parking brake? Are you sure?
>
> On my 2 Tercels. Pulling the e brake (parking brake?) lever actuated the
> adjusters.
>


Hmmm ...

I've never heard that before. I musta been sleeping.






From: Ray O on 23 Sep 2009 23:42

"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message
news:h9duqo$lrr$2(a)news.eternal-september.org...
> I'm confused.
>
> Once the rotors warp, they remain warped until they are machined or
> replaced. Warping is not a transient condition where the experience is on
> a mountain road but not on other roads. And, braking on a mountain road
> should be lighter and more evenly applied on a mountain road than in other
> places. The brakes might be used more often, but the braking ought not be
> "harder". It you are driving into a turn and mashing the brakes, your
> passengers are probably on the verge of puking.
>
> Having said that, slots and crossdrilling are done to help extract heat.

Not quite. The slots and cross drilling on the rotors allow the gases that
the pads generate when heated to escape more easily. If the gas can't be
cleared from between the pad and rotor quickly enough, the effect is kind of
like an air hockey table, reducing the contact between the pad and rotor and
creating brake fade. The slots in some pads serve the same purpose.
--

Ray O
(correct punctuation to reply)


From: Ray O on 23 Sep 2009 23:45

"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message
news:h9e2r4$q4r$1(a)news.eternal-september.org...
>
> "Hachiroku ????" <Trueno(a)e86.GTS> wrote in message
> news:pan.2009.09.23.18.35.27.328202(a)e86.GTS...
>> On Wed, 23 Sep 2009 08:50:13 -0700, SMS wrote:
>>
>>> The rotors on my 4Runner need to be replaced because when they heat up
>>> they warp and the brakes chatter. This occurs only when driving in the
>>> mountains where there's more harder braking than in city driving. The
>>> original rotors have been resurfaced once. and that's about it for them.
>>>
>>> Are there any higher performance rotors that are less likely to warp or
>>> fade than the stock Toyota rotors? What are the advantages and
>>> disadvantage of drilled versus slotted versus drilled and slotted versus
>>> plain? Do all slotted rotors have a left and right?
>>>
>>> Online I've found:
>>>
>>> Brembo Sport Rotors (drilled and slotted) $110 each Disc Italia (drilled
>>> and slotted) $115 each Disc Italia (slotted) $115 each
>>> Power Disc (drilled) $90 each
>>> Power Disc (slotted) $90 each
>>> X Brakes (drilled and slotted) $62.50 each Power Stop (drilled) $96 each
>>> Power Slot (slotted) $99 each
>>> Power Slot Cryo Slot (slotted) $130 each
>>>
>>> JC Whitney no-brand listed (drilled) $66 each
>>>
>>>
>>> What about brake pads? What should I get?
>>
>> What Ray said.
>>
>> Also check Endless. They specialize in Toyota brakes.
>>
>> I don't use drilled/slotted rotors because they wear the pads faster,
>> however, in your case they might solve your problem.
>>
>> As for the rears, most Toyta rear drums (if you have drums) are adjusted
>> by actuating the e-brake lever/handle. On models with the handle between
>> the seats, lifting the handle and lowering repeatedly adjusts the rear
>> shoes. The 4-Runner I am not that familiar with.
>>
>>
>>
>
> Rear Drum brakes self-adjust by using the parking brake? Are you sure?
>
> Back in the days of old, drum brakes self-adjusted when the brakes were
> applied while the vehicle was backing up.
>
> The idea is(was) that the primary and secondary shoes exchange roles in
> reverse, and the movement of the shoes pulls a cable that moves a lever
> that cranks a cog that holds the shoes spread apart. If the brakes needed
> to be adjusted, one simply drove backwards and applied the pedal as
> needed. Perhaps one had to repeatedly apply the brakes in Reverse if the
> brakes were significantly maladjusted.
>
> I was not aware that the rear shoes adjust because the parking brake
> handle (or pedal) gets used.
> >

Hachi is correct. The rear brakes are adjusted when the parking brake is
applied.
--

Ray O
(correct punctuation to reply)


From: Ray O on 23 Sep 2009 23:45

"Jeff Strickland" <crwlrjeff(a)yahoo.com> wrote in message
news:h9e3qk$3ag$1(a)news.eternal-september.org...
>
> "Hachiroku ????" <Trueno(a)e86.GTS> wrote in message
> news:pan.2009.09.23.21.18.08.124947(a)e86.GTS...
>>>>
>>> Rear Drum brakes self-adjust by using the parking brake? Are you sure?
>>
>> On my 2 Tercels. Pulling the e brake (parking brake?) lever actuated the
>> adjusters.
>>
>
>
> Hmmm ...
>
> I've never heard that before. I musta been sleeping.
>

Wake up! Hachi is correct.
--

Ray O
(correct punctuation to reply)


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