30-10-2013, 08:29am
(30-10-2013, 08:07am)Batfink Wrote: I am kinda in agreeance with shifu here peeps... brakes are basic hydrolics and as such there is only a couple of reasons your brakes could be fading (with the lever being able to be pulled back further than usual)....
1. master piston is allowing liquid past when engaged in compression (vary rare and will happen either warm or cold as seal had shat itself)
2. build up of moisture in hydrolic fluid which will vaporise under heavy use causing a highly compresable mixture in brake lines (all Glycol-ether brake fluids are hygroscopic which means it's absorbs water.. even DOT5.1)
3. A physical expansion of the brake system such as ballooning of brake line hoses, flexing of calliper body, etc.. replace any part that is experiencing enough "flex" to cause a "fading"
it is suggested to replace brakes fluids every 1-2 years for non track riding, after every track day for track riding to reduce this.
While the larger pistions of non OEM masters will mean you wont have use as much lever movement to creat the same fluid transfer at the caliper but it will also mean greater fade when/if moisture starts effecting the system.
BTW.. there are silicon based brake fluids which do not absorb water but they can form a water pooling effect in the system which can create a worse effect in the end.
another type of fading is the pads inability to grip the rotor.. this problem may require greater force applied on the braking lever which can seem like it is fading as in the first instnace but actually all it means is YOU are pressing/squeezing harder to try to stop. Poor pads that cannot cope with the braking heat can easily do this regardless of make/age/riding conditions
just my 2 cents worth
I,ll check the fluid for discolouring/loss and see where that takes me . pads only 2000km old but i,m starting to consider that the oem discs could be below average as they also tend to have become glazed very easily a problem it,s had since new only 8,500km on it.Will look at getting new discs ,Pads ,change fluid and if there has been fluid loss look at probably a Brembo master cyclinder and see where it goes from there