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Remove the caliper mounting bolts and remove the caliper. Replace brake pads as necessary. Special tool is required to retract caliper piston to fit over new pads. (see picture below) Retract piston in caliper using special tool to rotate clockwise and make sure the notch in the piston is aligned properly so the tab on the inner pad will fit in properly. Reinstall caliper assembly and caliper mounting bolts.
the pistons on the rear brake calipers on many modern cars screw in and out unlike the front caliper pistons that just slide in and out.This is due to the handbrake using the rear calipers for handbrake operation. A special tool is normally required that screws the pistons back in so that you can fit the new pads. On many cars one side will be a left hand thread and the other a right hand thread. Some cars will be the same thread. These rear pistons will not just push in. Good luck.
YOU NEED A PISTON COMPRESS TOOL TO PRESS PISTON BACK IN THE BORE WITH THE BLEEDER SCREW OPEN ON THE CALIPER*.CLOSE BLEEDER SCREW JUST BEFORE THE CALIPER PISTON IS PUSHED FULLY INTO CALIPER.THIS WILL ALLOW ROOM FOR NEW BRAKE PADS AND CALIPER FIT OVER THE BRAKE ROTOR.WHEN FINISH.PUTTING BRAKE PADS ON YOU HAVE TO BLEED BRAKE SYSTEM.DONT DRIVE VECHICLE IF YOU CANT GET A GOOD FIRM BRAKES.
Renault trafic brake calipers on the front can be pushed in with a G-clamp, but rear calipers need to be wound in, if you look at the piston it has notches for a winding tool!
The rear disk brake piston does not compress back into the caliper, it has notces on the caliper piston that a tool fits into and the caliper piston is actually turned or screwed back into the caliper, and a notch in the piston must also be aligned to fit the the small protrusion from the backing plate of the inner brake pad.
The brake tool can be obtained from most auto part stores, and it is usually square with protrusions sticking out from the sides in different patterns to fit various caliper pistons, and it usually attaches to a 3/8" drive extension and ratchet.
Do not compress this type of caliper piston because the caliper can damaged.
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.
G clapm and water pump pliers needed,slight compression on G clamp which is on back /piston slight pressure applied then turn the piston with the waterpump pliers ,better with two people one holding it and keeping pressure on G clamp whilst the other turns piston.Yes i know their is a special tool for this and every motor has its own style of tool but mine does all .
hiya the rear disc brakes are as front disc brakes auto adjusting however the rear brake calipers pistons have to be wound back into the caliper to enable new pads to be fitted if you look at piston you will see they have either slots or holes in the surface this is for a sutable implement/tool to fit and then turned clockwise whilst pressing piston as you wind/rotate it back into caliper for your info there is a tool made for this purpose made by draper or seeley tools which makes job easy diy and cost £9--99 uk and can be bought from most auto stores ? however it is possible to manage with the spanner with horse shoe open end commonly supplied with circular hand saws the spanner is the one used for replacing blade? i have used this in past with success but now have the expensive univesal tool for the job hope this helps?
assume you know that rear caliper pistons have to be wind back ? so if pistons are still proud and unable to fit new pads? disconnect the h/brake links from both calipers and ensure they are not siezed ? try wd40 to manually free em ? so they move to fully off position ? then push back pistons fit new pads then pump brakes to auto adjust ? then you will have to adjust the h/brake cable/s with h/brake off to enable to reconnect to each caliper hope this is of help to you best wishes from uk
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