Question about 2002 Kia Sedona
Cylinder froze I think. I can't press them. Want to put new callipers on. Is it simple
Pressing by disc brake caliper cylinder by hand unlikely, improbable. Using 10" jaw opening adjustable pliers with 12"~16" handles, with brake pads removed should be able to align a large socket inside the plunger cup and then using the large adjustable pliers, squeeze back very slowly just enough to install new disc pads. Forcing the cylinder cup to its fully retracted position not necessarily a good ideal unless you have some express need or purpose to do so as it will overflow your brake fluid reservoir. So be prepared with a clean new "turkey baster" and a clean jar to suction out of the reservoir of sufficient brake fluid to make room for the fluid you are forcing back to the reservoir. Since the cylinder sets in a rubber collar, very unlikely its rusted "frozen" in position. It is possible for the rubber collar to either deteriorate or be damaged, so look carefully at what you can see of the rubber collar with a magnifying glass, looking for any micro-cracks or signs of rubber dry-rot - - if found, replace, your life may depend upon it.
When finished installing new caliper pads with brake grease properly installed at points of metal to metal movement and retainer bolts properly torqued, and brake fluid reservoir properly filled, your first press of the brake may go all the way to the floor and you may need to pump the brakes several times to fully expand the caliper that you pressed backwards to its proper position. That may require refilling the brake fluid reservoir several times. If after pumping the brakes and getting a solid petal, it may be necessary to drive the vehicle backwards stomping on the brakes several times to set the rear brake shoe adjusters and raise the height of your brake pedal. If after replacing the calipers and adjusting you still have a spongy petal, it may be necessary to bleed air out of the brake lines for which there is an air bleed valve on each brake cylinder. Air bleed easiest accomplished with 2 people though devices are made for one person air bleeding. During air bleeding, the brake petal is slowly depressed and the air bleed valve momentarily opened. The end of the air bleed hose needs to be in brake fluid in a jar so that ejected brake fluid is captured and air cannot return. Using a clear air bleed hose lets you see when a solid flow without bubbles is released, then you have a good air bleed and can retighten the valve. You will need to refill the brake fluid reservoir several times during the air bleeding procedure. All four wheel cylinders must be air bled if any one or more brake cylinder opened or replaced. Any sign of a "wet" looking brake line or cylinder is a good reason to replace it even if you cannot identify the exact leak source.
Posted on Jul 27, 2014
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Posted on Jan 02, 2017
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