fastbob Posted March 10, 2019 Share Posted March 10, 2019 Right , this isn't my idea . I've seen a post on another forum where someone has got pitted brake pistons and has suggested putting them back in backwards with the open end inwards and the shiny closed end outwards . My first reaction was No ! But is this as daft as it sounds ? The fluid volume would increase but I can't see that the hydraulic force would be reduced ( or would it ? ) Obviously the rough bits would have to be cleaned up to avoid damaging the seal on assembly but after that they wouldn't be a problem. What do you think ? Quote Link to comment Share on other sites More sharing options...
mikestrivens Posted March 10, 2019 Share Posted March 10, 2019 If the rough bits are cleaned why not assemble normally? Quote Link to comment Share on other sites More sharing options...
Westbeef Posted March 10, 2019 Share Posted March 10, 2019 If its pitted it's not going to seal, surely? Clean up the faces so it doesn't wreck the seals but its gonna leave little crevices for fluid to seap through. Quote Link to comment Share on other sites More sharing options...
ThePhatomfart Posted March 10, 2019 Share Posted March 10, 2019 It would make the piston extracting tools redundant Quote Link to comment Share on other sites More sharing options...
megawatt Posted March 10, 2019 Share Posted March 10, 2019 Just fit new pistons FFS Quote Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2019 Share Posted March 10, 2019 I have a feeling the shape of the pistons are designed that way to try and dissipate some of the heat! and turning them around would make that useless Also as [mention]Westbeef[/mention] says if they are pitted they won't sealyou would have more chance of the pitting coming in to contact with the oil seals Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 10, 2019 Author Share Posted March 10, 2019 If the rough bits are cleaned why not assemble normally? I think they are very rough. Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 10, 2019 Author Share Posted March 10, 2019 If its pitted it's not going to seal, surely? Clean up the faces so it doesn't wreck the seals but its gonna leave little crevices for fluid to seap through. Yes but if you turn it round only the good bits are in contact with the seals . Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 10, 2019 Author Share Posted March 10, 2019 I have a feeling the shape of the pistons are designed that way to try and dissipate some of the heat! and turning them around would make that useless Also as @Westbeef says if they are pitted they won't sealyou would have more chance of the pitting coming in to contact with the oil seals On my Suzuki I would agree but on my ER there are removable plastic plugs in the open end of the pistons . Quote Link to comment Share on other sites More sharing options...
Snod Blatter Posted March 10, 2019 Share Posted March 10, 2019 I can only respect such a ghetto solution! The inside of brake pistons is always super grotty though. Quote Link to comment Share on other sites More sharing options...
Stu Posted March 10, 2019 Share Posted March 10, 2019 I have a feeling the shape of the pistons are designed that way to try and dissipate some of the heat! and turning them around would make that useless Also as @Westbeef says if they are pitted they won't sealyou would have more chance of the pitting coming in to contact with the oil seals On my Suzuki I would agree but on my ER there are removable plastic plugs in the open end of the pistons . Yes but plastic doesn't conduct heat as good as metal Quote Link to comment Share on other sites More sharing options...
xMachina Posted March 10, 2019 Share Posted March 10, 2019 I’d just buy new pistons. They aren’t usually that expensive and of all the places to skimp on spending brakes ain’t one of them! Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted March 10, 2019 Share Posted March 10, 2019 I’d just buy new pistons. They aren’t usually that expensive and of all the places to skimp on spending brakes ain’t one of them! Ah, but there comes a time when you need to save a few pennies....have you seen the price of coffins these days? Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 10, 2019 Author Share Posted March 10, 2019 The bloke on the other forum ( ER5 ) has ordered new ones after all . Personally I think it was a daft idea . Quote Link to comment Share on other sites More sharing options...
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