fastbob Posted March 10, 2019 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
mikestrivens Posted March 10, 2019 Posted March 10, 2019 If the rough bits are cleaned why not assemble normally? Quote
Westbeef Posted March 10, 2019 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
ThePhatomfart Posted March 10, 2019 Posted March 10, 2019 It would make the piston extracting tools redundant Quote
Stu Posted March 10, 2019 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
fastbob Posted March 10, 2019 Author Posted March 10, 2019 If the rough bits are cleaned why not assemble normally? I think they are very rough. Quote
fastbob Posted March 10, 2019 Author 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
fastbob Posted March 10, 2019 Author 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
Snod Blatter Posted March 10, 2019 Posted March 10, 2019 I can only respect such a ghetto solution! The inside of brake pistons is always super grotty though. Quote
Stu Posted March 10, 2019 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
xMachina Posted March 10, 2019 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
Mississippi Bullfrog Posted March 10, 2019 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
fastbob Posted March 10, 2019 Author 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
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