Thread: Is PB blaster OK to try to revive 7803 Dura Ace front brifter?
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Old 01-02-22 | 09:39 PM
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Andrew R Stewart
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Originally Posted by TiHabanero
About 10 months ago I used PB Blaster on some 105 9 speed shifters and lubed with Dumonde Tech Lite. To this day they still work like new. I use mineral oil mixed with ATF on mountain bike shifters and it works really well if I flush with Clean Streak first. There really is nothing that can get damaged by solvents inside the brifters that I am aware of. Once cleaned out a light lube such as Dumonde Tech Lite works well and keeps the parts working freely.
On Shimano's mid 1990s STI versions there's a plastic ring that closes the gap between the two "halves" the covers otherwise have. This molded and specifically shaped band can swell and no longer fit if left in some industrial solvents. Learned this the hard way, but the levers work w/o this sealing band for a while Andy
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