I don't claim to be an expert, but from what I understand it's the dirty fluid that can cause the damage to the braking system.
When bleeding a system, fluid is fed from the master cylinder to the calipers, through the ABS system. As the majority of the dirty fluid should be at the lower end of the system, bleeding it pushes it out through the bleed nipples. If you push the fluid the other way (i.e. when changing pads), then you push it back up though the ABS pump.
>> how would one force fluid through the ABS pump the wrong way?
As mentioned in my previous post.
"when fitting new pads a considerable amount of brake fluid is pushed back through the sytem (including the carp/sediment) into the master cylinder reservoir when pushing the pistons back in (to accommodate the new brake pads) unless you release the bleed nipples and clamp off the pipes."
Chances are, you'll get away with it, but there is always a risk you won't. I guess a lot of it is how dirty the brake fluid is, and when/if it has been changed.
Last edited by: VxFan on Tue 9 Oct 12 at 12:53
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