stuck caliper slides rear passenger 1996 850

[Andy]

I have a noise coming from my right rear brakes that sounds like a
snowplow metal blade grinding on a concrete highway.

I took the wheel off, and it looks like the rotor is travelling in an
arc that is too far outboard, as though the piston has slowly pushed
the rotor out over time. The rotor is rubbing on a part of the caliper
which does not allow clearance. The only explanation that I can come
up with for why this happened is that the slides must be completely
frozen.

This problem is so bizarre, that I have to post to find out if I'm the
only person this has happened to. I am planning on replacing the
caliper, pads and rotor on this side, and the pads on the other side.
I want to get good quality parts, because I don't want further
problems. I am looking at ordering from fcpgroton, unless there are
better recommendations.

Can any one tell me if I'm crazy, or if this seems like a reasonable
diagnosis? Thanks,

Andy

 

[Michael Pardee]

I have a noise coming from my right rear brakes that sounds like a
snowplow metal blade grinding on a concrete highway.

I took the wheel off, and it looks like the rotor is travelling in an
arc that is too far outboard, as though the piston has slowly pushed
the rotor out over time. The rotor is rubbing on a part of the caliper
which does not allow clearance. The only explanation that I can come
up with for why this happened is that the slides must be completely
frozen.

This problem is so bizarre, that I have to post to find out if I'm the
only person this has happened to. I am planning on replacing the
caliper, pads and rotor on this side, and the pads on the other side.
I want to get good quality parts, because I don't want further
problems. I am looking at ordering from fcpgroton, unless there are
better recommendations.

Can any one tell me if I'm crazy, or if this seems like a reasonable
diagnosis? Thanks,

Andy

Sounds reasonable to me. I've seen a lot of slide pins that have lost their
lubrication (the stuff is still there, but maybe water got in and ruined the
grease). It sure messes up the brake wear. I once forgot to lube one corner
of our 85 765T when I did the brakes and within a month the new Volvo pads
were worn away and had ruined the new brake rotor. Lesson learned.

Mike

 

[Glenn Klein]

I have a noise coming from my right rear brakes that sounds like a
snowplow metal blade grinding on a concrete highway.

I took the wheel off, and it looks like the rotor is travelling in an
arc that is too far outboard, as though the piston has slowly pushed
the rotor out over time. The rotor is rubbing on a part of the caliper
which does not allow clearance. The only explanation that I can come
up with for why this happened is that the slides must be completely
frozen.

This problem is so bizarre, that I have to post to find out if I'm the
only person this has happened to. I am planning on replacing the
caliper, pads and rotor on this side, and the pads on the other side.
I want to get good quality parts, because I don't want further
problems. I am looking at ordering from fcpgroton, unless there are
better recommendations.

Can any one tell me if I'm crazy, or if this seems like a reasonable
diagnosis? Thanks,

Andy

From what you are saying there is a noise in the rear brakes the slides
are no more than pins & a retainer that holds the brake pads in without
seeing & hearing my best guess is that the retainer is touching the edge
of the rotor the correction replace the pin kit on both sides the kit
comes with 4 pins & 2 retainers

--
"*-344-*Never Forgotten"
Is for the New York City Firemen who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
aiding in the initial rescue efforts. And I will never forget them as
long as I live,
nor should any American.

 

[Andy]

Glenn Klein wrote:
my best guess is that the retainer is touching the edge

of the rotor the correction replace the pin kit on both sides the kit

comes with 4 pins & 2 retainers

Glenn, your suggestion makes sense, thanks! I tried to find this kit,
and only found it for the 740. Any suggestions where I might find it
for the 850? I guess the obvious answer is the volvo dealer?
Andy

 

[John Horner]

Glenn Klein wrote:
my best guess is that the retainer is touching the edge


Glenn, your suggestion makes sense, thanks! I tried to find this kit,
and only found it for the 740. Any suggestions where I might find it
for the 850? I guess the obvious answer is the volvo dealer?
Andy

Rear brake hardware kits for the 850 are very easy to find.

Raybestos Part # H15604, Wagner #F132614S and others. Any auto parts store
can get them for you and it should be under $10 for the kit.
http://www.rockauto.com/ lists them online. FCPgroton probably has 'em
also.

Same goes for front hardware kits.

John

 

[Glenn Klein]

Glenn Klein wrote:
my best guess is that the retainer is touching the edge



Glenn, your suggestion makes sense, thanks! I tried to find this kit,
and only found it for the 740. Any suggestions where I might find it
for the 850? I guess the obvious answer is the volvo dealer?
Andy

They are the same kits as they used ATE calipers in the rear the pads
are the same in the rear 200 700 900 800
Glenn

--
"*-344-*Never Forgotten"
Is for the New York City Firemen who lost their lives on September 11,2001.
The official count is 343, but there was also a volunteer who lost his life
aiding in the initial rescue efforts. And I will never forget them as
long as I live,
nor should any American.

 

[Andy]

Andy wrote:

I got some decent weather this weekend, and took it apart. The
anti-rattle spring pins were indeed frozen on that side, and the
outboard pad was hardly worn. I had previously checked for pad wear,
and the outboard pad tricked me. The inboard pad was completely gone,
and inside of rotor scored. Lesson learned, all replaced. It seems to
me that these pins are such a weak point in the design that they should
be a maintenance item in themselves...perhaps remove, clean, and
replace every 50K. Can they be re-used if they are in decent shape?
Thanks,

Andy

 

[Michael Pardee]

I got some decent weather this weekend, and took it apart. The
anti-rattle spring pins were indeed frozen on that side, and the
outboard pad was hardly worn. I had previously checked for pad wear,
and the outboard pad tricked me. The inboard pad was completely gone,
and inside of rotor scored. Lesson learned, all replaced. It seems to
me that these pins are such a weak point in the design that they should
be a maintenance item in themselves...perhaps remove, clean, and
replace every 50K. Can they be re-used if they are in decent shape?
Thanks,

Andy

Yes on both counts. Sticking pins are so common I suspect they are a major
cause of brake pad wear. I have been lucky enough to be able to clean and
relube all the pins I've encountered so far, but replacements are usually
inexpensive enough it might be a fool's errand to reuse them.

My wife's car is a Toyota Prius hybrid, and the brakes are used so lightly
(normally relies on regenerative braking above 11 mph except on rough
surfaces or hard stops) that I expect to relube them at least once before
time for pad replacement. A Prius tech in the Yahoo Prius group recommends
relubing every 30K miles. 50K should be okay for Volvos, I'd guess.

Mike