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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Front brake was stuck on; will it happen again?Views : 1340 Replies : 18Users Viewing This Thread : |
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Apr 21st, 2018, 00:13 | #11 | |
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https://www.ebay.co.uk/sch/i.html?_f...pares&_sacat=0
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Apr 21st, 2018, 10:45 | #12 | |
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As it happens I have just had the exact same problem with my Trooper rear brake. Bought a new carrier and slider pins as I work away and was not due back to work for a couple of weeks. Brought the old carrier out to work with me and I have drilled the old snapped pin out. Well I drilled and tapped it M8, then used a long M8 bolt with a nut and washers with a larger nut to draw against used the M8 bolt and nut as a "Puller" worked a treat so I now have a spare. Obviosly, prevention is better than cure so every time you check your brakes, clean and re grease the sliders. I got caught because this was the first time I had seviced the Trooper since buying it. Oops should have added, YOU WILL NOT NEED GO TO M8 ON YOURS. The pins are larger on my trooper than our 940 Last edited by lynns hubby; Apr 21st, 2018 at 10:47. Reason: Add Info |
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Apr 22nd, 2018, 14:13 | #13 |
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Thank you. Hoses were replaced four years ago or so, so rebuilding the calipers is likely to be the way forward. Martin
Last edited by martin calva; Apr 22nd, 2018 at 14:15. |
Apr 22nd, 2018, 14:15 | #14 | |
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Apr 22nd, 2018, 14:20 | #15 | |
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Yes, I'm happy to work on brakes. Is copa grease NOT silicone? It does not mention the word silicone on the can but somehow I had the impression it was. Maybe simply because they recommend it for exhaust system nuts etc. Martin |
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Apr 22nd, 2018, 15:08 | #16 |
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Coppa grease is not really a grease for lubrication. It is in fact an assembly compound. It has short term lubrication for assembly which is great for threads etc but not for long term lubrication of surfaces designed to work together under lubrication. The trouble with coppa grease is the lubrication dries out under certain conditions, heat being one of them. It just leaves a coppa film. The other issue being that it reacts with the rubber components as in your pin boots and makes them swell and go soft which then alows water, dirt, brake dust etc in which defeats the job of the boot.
That is why silicone greas is the prefered option as it DOES NOT attack the rubber bits. Also when I mentioned earlier about cleaning out the holes the pins fit into with a twist drill, I obviously meant by rotating it with your fingers and not with any form of power tool. It seems that people jumped on the band wagon when factors started selling copa grease as brake grease. The only thing I use it for is a small film behind the pad on any contact area to stop "Squeal" |
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Apr 22nd, 2018, 15:17 | #17 | |
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It's essentially very tiny flakes of copper suspended in a high melting point grease to prevent nuts seizing onto bolts, studs etc from heat, corrosion etc. It can also be used between alloy wheels and steel hubs to prevent eletrolytic corrosion which can cause the wheel to stick to the hub. Until very recently, copper grease was always the default grease for brake mechanism parts - rear of the pads (not the friction surface) to prevent squeal, slides to prevent seizing and so on. However over the past few years, silicone grease has gained in poularity for use in place of copper grease, why i don't know as they have similar properties. I use silicone grease on door seals, sunroof seals etc to keep them moist and prevent them drying out, squeaking etc and also as an alternative to dielectric grease on battery terminals as unlike hydro-carbon based grease, it won't carbonise once hot and cause problems.
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Apr 24th, 2018, 14:05 | #18 | |
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I always have a small tube of silicone grease on hand but I don't know where to buy it in quantities suitable for car maintenance. Any suggestions? |
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Apr 24th, 2018, 14:13 | #19 | |
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For that reason, if i was to get a tub, this would be about the biggest i'd go : https://www.amazon.co.uk/Silicone-ge...ilicone+grease Goes without saying you'd have to be scrupulously clean when using it but there are probably other options similar, that was the first tub on Amazon i found, ebay would probably have a bigger selection.
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