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Old 06-20-2009, 01:43 PM   #1
futurescribe
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Default Replacing brake pads

I'm replacing my brake pads on the rear caliper of my yamaha seca II (1993). I've removed the old pads and am trying to push the caliper pistons back to make room for the new brake pads. The pistons won't budge. I removed the lid of the master cylinder, as instructed, and the manual indicates the caliper pistons should be able to be pushed back. But no luck. Any suggestions?
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Old 06-20-2009, 02:57 PM   #2
longride
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Sounds like the caliper needs a rebuild. Pop those pistons out and replace the seals and clean everything you can find. That should do it.
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Old 06-20-2009, 03:27 PM   #3
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You can use a bigger screwdriver, but LR is right.

Since you are that far, do the job properly. If the puck is that hard to move, it needs attention.

Before you get too far into it, drain off half the fluid in the M/C so it doesn't overflow.
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Old 06-21-2009, 02:01 PM   #4
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Likely the unit has never been disassembled and cleaned so there is a lot of crud built up on the piston. Do as suggested and remove, dismantle, clean the unit and replace the seals.
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Old 06-22-2009, 05:13 AM   #5
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The bleed hole in the master cylinder may be blocked, too. Best to open the bleed valve while prying.
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Old 06-22-2009, 02:05 PM   #6
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Or the last guy that changed em didnt bother cleaning the sides of the pistons off and just jammed the piston back in with out cleaning it at all.
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Old 06-22-2009, 03:40 PM   #7
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Quote:
Originally Posted by pplassm View Post
The bleed hole in the master cylinder may be blocked, too. Best to open the bleed valve while prying.
That's what I was going to say. Be sure the valve is pointing away from your face when performing this operation. Brake fluid leaves a nasty aftertaste.
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Old 06-22-2009, 04:26 PM   #8
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Quote:
Originally Posted by Kenneth_Moore View Post
That's what I was going to say. Be sure the valve is pointing away from your face when performing this operation. Brake fluid leaves a nasty aftertaste.
So you've heard................
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