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brake caliper seals

Jethro

Jethro

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I think I know the answer to this one:
Do brake caliper seals (for the pistons) swell over time? I mean, even if the seals are not leaking, and they are visiably perfect, they might have swelled over the years and now are the cause of my brakes dragging?
 
Plus a good clean out wouldnt hurt
Click to expand...

That's the thing. They were as clean as can be, but wicked stiff. It was a real bear getting the pistons out using compressed air (it was like a gunshot when the thing finally popped out).

I'm gonna try new seals anyway (might as well). Hopefully that will fix my dragging brakes.
 
Jethro said:
Plus a good clean out wouldnt hurt
Click to expand...

That's the thing. They were as clean as can be, but wicked stiff. It was a real bear getting the pistons out using compressed air (it was like a gunshot when the thing finally popped out).

I'm gonna try new seals anyway (might as well). Hopefully that will fix my dragging brakes.
Click to expand...

I would rebuild the master cylinder. There is a tiny (almost microscopic) hole that is the return to the brake fluid reservoir...if it is plugged the brakes will drag. I use a cutting torch tip cleaner (the smallest one) to clean out this hole.

Hap
 
I would rebuild the master cylinder. There is a tiny (almost microscopic) hole that is the return to the brake fluid reservoir...if it is plugged the brakes will drag. I use a cutting torch tip cleaner (the smallest one) to clean out this hole.
Click to expand...

Is this in the bottom of the fluid reservior? Or do I access it through where the banjo bolts in? Do I have to remove the piston behind the lever?
 
Jethro said:
I would rebuild the master cylinder. There is a tiny (almost microscopic) hole that is the return to the brake fluid reservoir...if it is plugged the brakes will drag. I use a cutting torch tip cleaner (the smallest one) to clean out this hole.
Click to expand...

Is this in the bottom of the fluid reservior? Or do I access it through where the banjo bolts in? Do I have to remove the piston behind the lever?
Click to expand...

Yeah it's in the bottom of the reservoir, along the casting hump for the piston, which you may want to remove to avoid inadvertently damaging the seals or the piston itself... plus you need to clean any grunge out of the piston bore too, you may want to get a rebuild kit since you'll have it all apart anyhow, just lubricate the new seals with brake fluid before reassembly, but don't soak them for any extended length of time, as the brake fluid can swell the rubber enough to make assembly impossible
 
my piston was realy stuck, had to use a grease gun to get it out, and then clean up the mess..lol
 
I used a bicycle pump, 5/16 fuel line and a banjo bolt cut off like a tube all clamped together and screwed into the caliper. Came out like a gunshot.
 
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