4 pot calipers - rubber "boots" around pistons
26 April 2002, 04:21 PM
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I noticed that the rubber was a bit "wavy" and slightly perished around the pistons after one track day. Obviously I can't go replacing them every time - it did not look like they were sealing anything whatsoever - I guessed just a dust guard and to stop the piston rubbing the caliper as it operates? Is this an issue?
28 April 2002, 05:59 PM
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they are made of very soft rubber,as long as they are not burst I would not worry about it.some racing brake calipers do not run these seals but they do not have to put up with the dirt/salt etc from daily use.
28 April 2002, 09:12 PM
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John,
Over the last six months I have researched (and observed) a huge body of opinion about brakes. I am no expert but have concluded that dust seals around pistons are a carry over from a bygone age. Their necessity is not recognised by racing engineers but apparently their presence comforts the buying public. I have just installed a competition set-up with stainless pistons that operate without "seals" as on most track appications. As you rightly point out, a fade resistant brake installation will continue operating at temperatures well beyond the melting point of rubber dust seals.
JJ
Over the last six months I have researched (and observed) a huge body of opinion about brakes. I am no expert but have concluded that dust seals around pistons are a carry over from a bygone age. Their necessity is not recognised by racing engineers but apparently their presence comforts the buying public. I have just installed a competition set-up with stainless pistons that operate without "seals" as on most track appications. As you rightly point out, a fade resistant brake installation will continue operating at temperatures well beyond the melting point of rubber dust seals.
JJ
28 April 2002, 11:50 PM
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JJ, racing calipers don't have seals because they are cleaned and checked after every race. On a road car, you risk sticking pistons and corroded calipers. Which is why Brembo, AP Racing, Alcon etc fit seals and a durable finish to all their road going products.
Richard.
Richard.
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30 April 2002, 11:30 AM
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Road calibres need dust seals, On Racing cars they don't care as they clean it after each race.
I have the same problem as John, after a track day my seals was melted. I have just ordered new ones, price was around 30 pounds for one calibre.
Lars
I have the same problem as John, after a track day my seals was melted. I have just ordered new ones, price was around 30 pounds for one calibre.
Lars
30 April 2002, 02:08 PM
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You can buy the Caliper Piston Seal kit from your nearest Subaru Dealer, I paid around £15 for a set not so long back and that did 4 pistons.
Have fun getting them on with the circlip supplied, bugger of a job
O.M.
Have fun getting them on with the circlip supplied, bugger of a job
O.M.
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