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Re: how to compress the caliper cylinder
The piston doesn't screw in, that is usually for vehicles with rear disc brakes that incorporate the park brake in the caliper. The correct way for yours is to open the bleed screw and compress the piston. The most common (shade tree) way is to simply use a screwdriver and pry against the rotor pushing the piston back. Some pistons are ceramic so be careful not to crack it. If you pry between the old pad and rotor you should be ok.
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The pads are easy to change. You do not need any special tools. If there are no grooves in the rotors I would just put on new pads. Don't get cheap pads or they will squeek. I would strongly suggest that you flush out the old brake fluid. You will be amazed at how brown and gunky the old fluid is. Flushing the fluid regularly will help make your calipers and master cylinder last a long time. I like to use Valvoline Synpower brake fluid, it is a couple bucks more but it is DOT 4.
One last tip. When compressing the brake caliper piston you do not want to push the fluid back up to the system, because you might get some crud into the ABS module. Therefore, when compressing the piston, loosen the bleed screw to let the fluid flow out of the bleed screw.
This is how to get it done:
Remove the old fluid from the master cylinder resevior with a turkey baster. Top up master cylinder with fluid.
Remove the right rear wheel and bleed/flush the brakes with the old pads on. Top up master cylinder with fluid(important). Remove the caliper, open the bleed screw and compress the piston, close the bleed screw.
Did you try opening the bleeder screw on the caliper it self. If you still can't compress the piston back into the caliper after opening the bleeder screw you may have a caliper that is locking or locked up. Sometimes a big pair of channel locks and a lot of muscle can compress the caliper again. If not you may need to replace the calipers. Make sure to ask for rebuilt verses new. there is a huge price difference.
no that is only the older rear calipers on gm and others. the fronts do not have that style caliper and sound like the calipers are frozen and may be way your changing the pads. try opening the bleeder screw and then compressing them if they go then you need need brake hoses and if not you need calipers. god luck man
As far as I know, most front disc brake setups have pistons that are pressed back into the cylinders using a C-clamp or something similar.
However, not all rear disc systems are like this. There are some that require that the rear pistons be screwed back into the cylinder bores. These pinstons usually have some kind of indentations on the front where special tools fit and help move them back into the cylinder.
Special tool is a 1" cube with tabs on each side that fits into indentations on the brake piston and can be purchased for $10-12 @ most discount parts stores. Use 3/8" ratchet with short extension and 'special tool to carefully turn piston onto internal hand brake screw. Take care to not tear dust boot. When piston is fully collapsed, make sure to align piston indentations perpendicular to brake pad as there are bumps on pad that fit into them. Also while screwing in piston either remove about 2/3 of brake fluid in master cylinder and refil afterwords or open the bleeder valve on brake piston assembly. Bleed if necessary.
I assume you need to know how to compress the piston into the brake caliper. With the caliper mounted on the spindle, open the bleed screw slightly then gently press against the brake pad to compress the piston. Close the bleed screw. Once you have the caliper removed from the vehicle, open the bleed screw and compress the piston the rest of the way using a piston compressor or channel-locks. Close the bleed screw when you are finished.
you should be able to compress the piston in the caliper with ease but a word of caution. you should open the bleedr screw when compressing the piston because of your ABS system. you could run into problems with the abs if you don't open the bleeder. if you are haveing problems compressing the piston with the bleeder screw closed you may have a siezed caliper or collapsed brake line. if you still can't push the piston in with the bleeder screw open you have a siezed caliper.