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LR rotor is scraping on rotation ('94 855T)

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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Re: LR rotor is scraping on rotation ('94 855T)

Post by BlackBart » Sun Aug 25, 2019 8:37 pm

Eddystone - not rambling at all. Thanks. Bad steel is an interesting thought - I think they were a moderate price option from ipd or FCP. It could be that's a rust spot from sitting in the snow, I don't know - it's the only one on 4 sides. But for a bit, I wondered if I had an out-of-round rotor. My NAPA will turn rotors for $10 apiece - worth doing I think, to see if that spot carves away.

abscate - thank you. As you suggest, I'll run fluid through both rears and bleed. Earlier you suggested using a block that allows the pistons to travel inward about half the pad thickness. Are you saying press the pads towards this block with the pedal, then manually press them into the bores and repeat a few times to get some movement?

scot(Neil) - I did not know that about bedding parking shoes. But I've never actually messed with a parking brakes other than some adjustment. (remember when American cars adjusted themselves when you braked backing up?) Some of my cars have had a parking brake mechanism that pinches the regular disc pads into the rotor. The drum interior is a bit rusty dusty because I had the shoes backed way off after installing the rotors, and they were just barely touching on the left side.

Cables seem to be fine. Everything underneath looks very sound and surprisingly clean. Brake handle now grabs solid at about halfway up - didn't count the clicks yet.

And cheers from your neighbor to the south.


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Re: LR rotor is scraping on rotation ('94 855T)

Post by abscate » Mon Aug 26, 2019 4:12 am

Pull the pads out and put a block in about half their thickness. This lets the piston move farther out in the caliper and flushthe working area of the caliper. Feel the piston and see if it I still smoothly moving


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Re: LR rotor is scraping on rotation ('94 855T)

Post by Eddystone » Mon Aug 26, 2019 8:58 am

scot850 wrote:
Sun Aug 25, 2019 3:55 pm
Volvo has a bedding in/cleaning process recommendation for parking breaks involving driving for a short distance with the parking brake engaged. Can't recall the exact details but think it was around 50 meters.
My hat is off to Neil and Abscate if they are able to adjust the parking brake shoes with any predictable effect. I know how simple the mechanism is (likely designed by a simple person) and how it works. I just cant get a tool in there to spin that star wheel any better than I could on most other drum brakes despite having the proper tool. I am always happy is they have SOME effect when I pull the handle and don't go scrape-scrape as I ride along.

Neil, if there's any chance you could post that break-in procedure, it would be useful.


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Re: LR rotor is scraping on rotation ('94 855T)

Post by Eddystone » Mon Aug 26, 2019 9:14 am

BlackBart wrote:
Sun Aug 25, 2019 8:37 pm
Eddystone - not rambling at all. Thanks. Bad steel is an interesting thought - I think they were a moderate price option from ipd or FCP. It could be that's a rust spot from sitting in the snow, I don't know - it's the only one on 4 sides. But for a bit, I wondered if I had an out-of-round rotor. My NAPA will turn rotors for $10 apiece - worth doing I think, to see if that spot carves away.
It's been a long time since I've heard of anyplace turning rotors. I'm always afraid of them going getting too thin and warping as a result. Back in the 60s and 70s weight was no object for American cars, and the rotors and drums were quite thick, so cutting them once or twice was no problem. I once owned and worked on a 1972 Buick Electra 225 and was continually amazed at how bulky and strong everything was. Not efficient engineering - just wretched excess ensuring long and trouble-free service life.

I am on my third set of Zimmerman rotors that are supposedly manufactured in Germany. Who knows? They are inexpensive and coated so that they remain aluminum-silver colored through the wheels. The wear surface will obviously rust if left too long. Some (or at least one) have reported problems with Zimmerman rotors, but they have been fine for me. I order them from wherever they are cheapest, and that tends to be Amazon where they run about $34 each. I tend to try to buy quality aftermarket parts when I can (often from the OEM supplier to Volvo) and genuine Volvo parts where there is a consensus on the list that OEM is the only way to go.

I try to avoid parts from mainland China, if possible, not because they can't make quality products but because you never know what quality you are buying. I'm less concerned about buying Taiwanese parts based upon personal experience. It's a fact these days that you often have no idea where the parts you buy are actually manufactured. I have been favorably impressed with some Eastern European aftermarket parts. There are a few brands I simply will not purchase and Uro is one of them.


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Re: LR rotor is scraping on rotation ('94 855T)

Post by BlackBart » Mon Aug 26, 2019 9:49 am

I think these are Zimmermann, from ipd. They are pretty new mileage-wise, and have never been cut, and have no rust ridge at the outer edge. I just want to clean them up and make sure they're flat.


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Re: LR rotor is scraping on rotation ('94 855T)

Post by scot850 » Mon Aug 26, 2019 6:15 pm

I had a set of Zimmerman rear rotors turned when new as they were warped out the box. Lasted until after I sold the car 4 years later.

Finding someone with the gear to turn them now that aftermarket ones are so cheap. FCP have a lifetime warranty too.

Neil.


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Re: LR rotor is scraping on rotation ('94 855T)

Post by BlackBart » Mon Sep 02, 2019 12:08 pm

Shiny flat rotors....10 bucks apiece at NAPA. It looks like they use a rotary stone rather than a cutting lathe as they have a swirl texture to them.

I think I'll replace the pad hardware too, as it's a bit rusted and the left spring clip might be just touching the rotor.

That funny spot on the inside is gone and he only cleaned off a thousandth.
IMG_4311.JPG
IMG_4313.JPG

I took a block with rough sandpaper to the pads to clean any glaze off.
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ex-1984 245T wagon
1994 850T wagon
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Is it time for a 1964 122 wagon?

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Re: LR rotor is scraping on rotation ('94 855T)

Post by BlackBart » Sat Sep 07, 2019 4:35 pm

Replaced the fluid in the reservoir. Not really dirty - light amber I'd say. Flushed the rear calipers with quite a bit of fluid. I put in loose pads and a thin shim and had a helper press the brakes to move the pistons out, I pushed them back in. Did this several times. On the right rear, the outer piston is coming right out, the inner doesn't look like it's moving. No leaks, boots look fine.

My inner cylinder is frozen?


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Is it time for a 1964 122 wagon?

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Re: LR rotor is scraping on rotation ('94 855T)

Post by abscate » Sat Sep 07, 2019 4:46 pm

Yep, that’s the diagnosis. That will make the rotor rust badly on one side and basically suck.
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Re: LR rotor is scraping on rotation ('94 855T)

Post by BlackBart » Sat Sep 07, 2019 5:48 pm

I saw your write-up from a year or two ago - seems to be the same issue, but mostly original parts on mine. (much drier here it seems). I find ipd receipts that show I put on all four rotors in late 2011, but very little use since then.

I suppose the danger of a seal kit is you get it apart and the pistons and bores are rusted badly and you're buying calipers anyway.

I see a factory reman for $152 here...
https://www.volvopartswebstore.com/prod ... 03813.html

Nugeon reman for $65 at Pelican...
https://www.pelicanparts.com/More_Info/ ... gJZ8fD_BwE

Skandix, 90 euros baby.....
http://www.skandix.de/en/spare-parts/br ... t/1004397/

Not seeing any rear calipers at ipd, uh oh...

I see a WBR (?) at FCP for $55 for left, but no right.
A Centric left rear for $68.
A Centric RIGHT rear for $68, but it's "with smaller mounting hole." What does that mean - the 2 13mm caliper bolts?
And that's it at FCP - these aren't getting to the age where parts aren't available, are they?


ex-1984 245T wagon
1994 850T wagon
2004 XC70 wagon BlackBetty
Is it time for a 1964 122 wagon?

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