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futurescribe · 06-20-2009, 12:43 PM

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?

longride · 06-20-2009, 01:57 PM

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.

pushrod · 06-20-2009, 02:27 PM

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.

seruzawa · 06-21-2009, 01:01 PM

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.

pplassm · 06-22-2009, 04:13 AM

The bleed hole in the master cylinder may be blocked, too. Best to open the bleed valve while prying.

MOKE1K · 06-22-2009, 01:05 PM

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.

Kenneth_Moore · 06-22-2009, 02:40 PM

Quote:

Originally Posted by pplassm

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.

The_AirHawk · 06-22-2009, 03:26 PM

Quote:

Originally Posted by Kenneth_Moore

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................

06-20-2009, 12:43 PM	#1
futurescribe Registered Member Join Date: May 2009 Posts: 3	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?

06-20-2009, 01:57 PM	#2
longride Super Duper Mod Man Join Date: Nov 2001 Location: Anywhere they let me Posts: 10,484	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. __________________ I'm a knucklehead

06-20-2009, 02:27 PM	#3
pushrod Founding Member Join Date: Nov 2001 Location: Baja 'Bama Posts: 3,478	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. __________________ You would not understand, this is not how I am... I have become - Comfortably Numb.

06-21-2009, 01:01 PM	#4
seruzawa Robby Join Date: Nov 2001 Location: 8501 ft. Posts: 16,803	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. __________________ I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tanhauser Gate. All those moments will be lost in time, like tears in the rain.

06-22-2009, 04:13 AM	#5
pplassm Founding Member Join Date: Nov 2001 Posts: 3,875	The bleed hole in the master cylinder may be blocked, too. Best to open the bleed valve while prying. __________________ Mongo just pawn in game of life.

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06-22-2009, 01:05 PM	#6
MOKE1K Registered Member Join Date: Jul 2008 Location: Kalapana, Big Island Posts: 3,956	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. __________________ "YOU CAN'T BOLT ON SKILL" "The only thing limiting your bike, is you" We survived Bush you'll survive Obama! "the most fundamental fact about the ideas of the political left is that they do not work. therefore we should not be surprised to find the left concentrated in institutions where ideas do not have to work in order to survive." --thomas sowell