Uneven brake pad wear 1995

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Old 29 Aug 2006, 08:51 pm   #1 (permalink)
camry-keeper
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Default Uneven brake pad wear 1995

While changing front pads, the right side was much more worn than the left
(.25in more), and the outer was more worn than the inner, but to a lesser
extent. Standard Bendix semi-metallic pads. Wore out in 25k miles/2yrs.
Anything to be concerned about?

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Old 29 Aug 2006, 09:50 pm   #2 (permalink)
Daniel
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Default Re: Uneven brake pad wear 1995

camry-keeper wrote:
> While changing front pads, the right side was much more worn than the left
> (.25in more), and the outer was more worn than the inner, but to a lesser
> extent. Standard Bendix semi-metallic pads. Wore out in 25k miles/2yrs.
> Anything to be concerned about?

=========================================
Toyota stock brake pads are ceramic (wear longer and quieter than semi
metallic from what I understand) but that's beside the point.
There are two factors that can cause uneven brake pad wear.
First would be the sliding pins.
Second would be the calipers.
I noticed uneven brake pad wear for some time, then one morning the
calipers seized and required replacement. Toyota sells remanufactured
units.
In replacing the calipers I also replaced the pads, shim and fit kit,
rotors, sliding pins, dust boots and flex lines. In my case the
calipers froze up to the point the car was nearly undriveable.
I used synthetic grease.
Dust boots were easy to remove and install, plus they're inexpensive.
The Toyota manual calls them a "non reusable part." You knock them out
with a hammer and flat bladed screwdriver, and drive them in with a
socket.
I needed vice grip pliers to twist and pull the old pins out whereas
the new sliding pins with synthetic grease allowed the calipers to move
freely. Every time you apply the brakes, the caliper moves on those
sliding pins. If they're not sliding properly you'll get uneven brake
pad wear.
I would guess this could lead to overheating, which might cause the
calipers to fail sooner. If the brake piston cannot be pushed back with
reasonable force, then the calipers are sticking also.

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Old 30 Aug 2006, 12:12 am   #3 (permalink)
johngdole@hotmail.com
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Default Re: Uneven brake pad wear 1995

The firstwould be sticking caliper pins. They need to be cleaned and
well lubed. Permatex has excellent synthetic gel that I prefer. Great
stuff.

http://www.permatex.com/products/aut...per_Lube_1.htm

With time the caliper rubber will harden and leak among other things.
It's faster and cheaper to get a rebuild if you consider the price of
the new hardware cost about as much: NAPA Auto Parts gives you new
caliper pins, pin boots, pad retainers, caliper mounting bolts, new
washers with each rebuild that comes with a new caliper piston. Yes, do
get a new brake hose and rotor with if you need to change out the
caliper. Even the new EPDM rubber brake hoses can be damaged by
electrolysis/copper corrosion from the lack of brake fluid changes.

Semi-mets provide excellent stopping power, but they are very dusty and
last about 20-25K miles. If you tow or carry full loads then semi-mets
still have advantage over ceramics. OEMs are ceramic and these are what
the replacements should be. Ceramics provide good average driver
performance with longer service life (at least two fold) but they do
not have the heavy duty thermo capabilities of semi-mets. Then again,
most drivers do fine with cermaics and enjoy the light dust and long
service life.

I get the aftermarket Akebono ProAct cermaics. Sometimes the dealer
will give you Akebono but mostly you get the cheaper NBK and who knows
what these days, but the Lexus division gets the Akebonos. NBK glazes
and fades much more easily than Akebonos. I buy aftermarket so I know
it's always Akebono.

Raybestos Raymold rotors work very well at under $20 each.



camry-keeper wrote:
> While changing front pads, the right side was much more worn than the left
> (.25in more), and the outer was more worn than the inner, but to a lesser
> extent. Standard Bendix semi-metallic pads. Wore out in 25k miles/2yrs.
> Anything to be concerned about?


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Old 01 Sep 2006, 06:46 pm   #4 (permalink)
camry-keeper
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Default Re: Uneven brake pad wear 1995

Thanks -- I noticed that the standard bearing grease I used on the pins
last pad change was basically non-existent/dried up, so I used a moly
hi-temp grease, which I hope will work better. I didn't do anything to the
piston: is there any way to test them or do preventative maintenance?
They're original at 11 years/165,000 miles.

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Old 01 Sep 2006, 10:43 pm   #5 (permalink)
johngdole@hotmail.com
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Default Re: Uneven brake pad wear 1995

Standard wheel bearing grease, moly fortified multi purpose shouldn't
be used in the brake system. Some can run because of the temperature.

There are specially formulated brake lubes of the synthetic gel or
moly/graphite types. Your local NAPA or other auto stores should have
both. They are as little as ~$1 per 5ml pack. I use one pack on each
caliper. Make sure you use only lubricants designed for brake systems
and it won't disappear.

The caliper piston should be easy to retract, at least on these cars.
If you pull it hard towards the pad, the piston should retract slightly
into the bore, allowing you clearance to pivot or remove the caliper
back and forth on the anchor pins. If you can't do this using manual
force and have to use a piston tool to retract it, then I'd say the
caliper may not be in that good of a shape.

IMO the best way is to get a rebuilt, I like to use NAPA rebuilt
calipers. In some cases I think I even got new castings with all new
components (piston, boots, anchor pins, mount bolts, etc), unless they
cleaned them really well. The cost is about the same if you were to get
all the parts but you get a warranty with rebuilts. You don't need
taking the whole thing apart and then finding out the caliper needs a
rebore and a new piston in addition to a typical caliper kit. It just
isn't worth the extra time and money.

When you change out a caliper, consider changing the brake hose too --
basically all the rubber parts in that area.


camry-keeper wrote:
> Thanks -- I noticed that the standard bearing grease I used on the pins
> last pad change was basically non-existent/dried up, so I used a moly
> hi-temp grease, which I hope will work better. I didn't do anything to the
> piston: is there any way to test them or do preventative maintenance?
> They're original at 11 years/165,000 miles.


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Old 01 Sep 2006, 11:51 pm   #6 (permalink)
johngdole@hotmail.com
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Default Re: Uneven brake pad wear 1995

Here is a comparison using www.rockauto.com prices:

A rebuilt caliper for 95 Camry LE 5SFE costs $45.89
* RAYBESTOS Part # FRC10236 Front; SEMI-LOADED RIGHT CALIPER ASSEMBLY
{Friction Ready} $45.89


A typical rebuilt would give you new mounting hardawre and rubber parts
like the following:
* Piston: RAYBESTOS Part # DPS85420 Front; Steel Piston {1.93" Overall
Length 2.249" Piston Diameter} $24.79
* Anchor pins/mounting bolts: RAYBESTOS Part # H15157 Front $11.76
* Pad retainers: RAYBESTOS Part # H15760 Front; Except Antilock Brakes;
Now Available as Axle Kit. When Ordering, Use Existing Part No. With an
"A" for a Suffix. $17.86
* Anchor pin bushings: RAYBESTOS Part # H16068 Front; Inner and Outer;
Axle Bushing Kit; Except Station Wagon $6.10
* Piston boot and seal: RAYBESTOS Part # WK1819 Front; Except Antilock
Brakes $6.02
Total: $49.72

Of course, if you can reuse the piston and don't need any more than
spray cleaning and Scotch-briting the bore, then you'll save $24.79 by
not needing the piston. If you change your brake fluid every year or
two and don't live in the rust belt, then there is a good chance you
can reuse it.


camry-keeper wrote:
> Thanks -- I noticed that the standard bearing grease I used on the pins
> last pad change was basically non-existent/dried up, so I used a moly
> hi-temp grease, which I hope will work better. I didn't do anything to the
> piston: is there any way to test them or do preventative maintenance?
> They're original at 11 years/165,000 miles.


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