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+--- Thread: Brake Caliper Pistons (/showthread.php?tid=72384)
Re: Brake Caliper Pistons - Fazerider - 08-05-15
:agree
Agreed, that particularly bad piston would be best changed. The brakes should be ok for the lifetime of one set of pads then.
The trouble with attacking them with abrasives is that you may have damaged/removed the chrome plating badly enough that corrosion will really get its teeth into the surface as the pads wear down. I would have heeded the advice about keeping them away from the wet-n-dry.
Re: Brake Caliper Pistons - anutz - 08-05-15
:'( well i think i will just replace the lot and start fresh with proper maintanence.....which i have no problem with - turns out a second hand bike is very expensive!
Just in the process of getting some idea of price from powerhouse as if i am buyin new pistons and seals i may as well get the done and forget about it
I can see what you mean with the abrasives - assume you mean the wonder wheels i used....
the wet and dray i assume also is a culprit for removing the fine finish?
Anyway will update as i slowy leverage money...
Re: Brake Caliper Pistons - anutz - 08-05-15
ok so - cannot afford to replace all 4 now so going to re-assemble and see what they are like, they did not leak before just stuck so surely i can get some safe mileage out of them - not going back on the road till and MOT in a few weeks anyway
Re: Brake Caliper Pistons - darrsi - 08-05-15
You have to be lucky, like i have been before, but sometimes you can pick up a whole caliper in very good working order for much less than it costs to replace parts.
As with all things on a bike though, prevention is always better than cure.
Re: Brake Caliper Pistons - fazersharp - 08-05-15
Like has been said the bad bit is outside of the seals so I cant see a problem, rather than red grease (after fitting) would copper grease be better on those ends that are constantly exposed to keep rust at bay now that the chrome has been removed.
Why dont they make them from stainless steel is it just cost.
Re: Brake Caliper Pistons - anutz - 08-05-15
yep a little copper grease is what my friend suggested - i am just checking that the marks ARE above the fluid seal - one may be right on it so might change one piston....which i can afford
Re: Brake Caliper Pistons - darrsi - 08-05-15
top So you reckon putting grease with particles of metal in it being moved tight against rubber seals won't cause any issues? :rolleyes As advised, several times, on here, ONLY use Red RUBBER Grease.
Re: Brake Caliper Pistons - darrsi - 08-05-15
(08-05-15, 12:09 PM)anutz link Wrote: yep a little copper grease is what my friend suggested - i am just checking that the marks ARE above the fluid seal - one may be right on it so might change one piston....which i can afford
Does your friend not really like you? :pokefun
Just read that aside from the metal particles causing havoc, copper grease is petroleum based and will make the seals swell causing binding and will eventually cause them to perish.
Nice....... :lol
Re: Brake Caliper Pistons - anutz - 08-05-15
clearly he does not - will give it a miss and just re-assemble as normal
Re: Brake Caliper Pistons - anutz - 08-05-15
i think i might go and snap a few exhaust studs.....that was actually more fun! :'( :rollin
Re: Brake Caliper Pistons - fazersharp - 08-05-15
(08-05-15, 01:39 PM)darrsi link Wrote:I waw thinking on parts away from the seals - like they tell you to do the back of the pads
As advised, several times, on here, ONLY use Red RUBBER Grease.
Re: Brake Caliper Pistons - anutz - 08-05-15
so was i to be honest, on the bits i removed the chrome finish off etc....?
Re: Brake Caliper Pistons - Jules-C - 08-05-15
Keep the copper grease away from any contact with the calliper body if possible. It can encourage the aluminium to corrode if there are any scratches in the anodizing. I normally use non metal based brake greases such as mintex ceratec for back of pads, brake pins etc
Re: Brake Caliper Pistons - fazersharp - 08-05-15
I suppose if red grease will protect just as well then best to be safe, I just get the impression that red grease is not as robust in staying where you put it as copper grease would be as it is made for assembly, just thinking rubber grease is sort of transulant/ watery - not quite and dosent seem like it would stand up to the weather.
And if other grease is a no no with rubber - how come you pack rubber gatered joints on your car with non red rubber grease
Re: Brake Caliper Pistons - darrsi - 08-05-15
(08-05-15, 02:57 PM)fazersharp link Wrote: I suppose if red grease will protect just as well then best to be safe, I just get the impression that red grease is not as robust in staying where you put it as copper grease would be as it is made for assembly, just thinking rubber grease is sort of transulant/ watery - not quite and dosent seem like it would stand up to the weather.
And if other grease is a no no with rubber - how come you pack rubber gatered joints on your car with non red rubber grease
Straight from the horses mouth.....
http://www.redrubbergrease.com/
Re: Brake Caliper Pistons - fazersharp - 08-05-15
I got a tub of the castrol one mmmmmm like a tube of just the ripple bit in raspberry ripple (only thicker, and red and dosnt taste like raspberry, and might kill me if I ate it all)
Re: Brake Caliper Pistons - anutz - 08-05-15
yes it might kill you if you eat it all....but there is only one way to find out....grab a spoon.....
Re: Brake Caliper Pistons - Jules-C - 08-05-15
Traditional red rubber grease wouldn't kill you it was based on vegetable castor oil which people used to take to keep themselves regular.
The new ones are often synthetic based.
Re: Brake Caliper Pistons - fazersharp - 08-05-15
ooo ooo got to go got to go.
to the loo (I ate the tub )
Re: Brake Caliper Pistons - unfazed - 08-05-15
Some of the marks extend beyond the dust seal when the pistons are pushed home for fitting new Pads. :eek
On the poor advice of copper grease on the Pistons I would have to question the persons :fish knowledge of brakes, brake piston seals and copper grease. I have seen instances of premature wheel bearings fail from fellows coating the axle with copper grease, the copper getting into the bearings. In one case it was when a fellow asked me if he was fitting the bearings correctly after 3 failure in 18000 miles that I realised what he was doing.
The copper grease would more than likely cause premature wear on the seals.
I repeat what I said earlier, if mine were like that I would replace them. :rolleyes
Brakes are not an item I would ever skimp on and the same applies to tyres. :eek