Question about Cars & Trucks
I cannot retract the rear caliper pistons to re-install them over new pads
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Posted on Jan 02, 2017
I fill you in what I learned today. I have a 2005 S-Type Jaguar and the dealer sayed it needed new pads in the rear. They wanted $300 just for the pads and another $150 or so to install. That $450 bucks to replace the brake pads only on the rear of the car. And of course, the extended warranty doesn't cover this, so I said no thanks. I found the best brake pads from Napa for $52. I purchased them through my brothers shop- saved a little. I done lots of brake pad replacements over the years, but not on a new car like the Jaguar. Well they are a little different and the frist one took me awhile . Here is the trick. 1) MAke sure the parking brake is off and you do this by starting the car, stepping on the normal brake and then pushing the parking break lever down while shutting off the car. 2) You then take the tire off, use jack stands to ensure safety.3) Take off brake callipers, 2 bolts and the brake pads should just fall off.4) take the anti-rattle plate off the old pads by prying it off carefully with a tiny screw driver- clean and then install on the new ones. 5) Here I release the the valve for the brake fluid. I did not want to damage the system if the fluid went back into the system when I retracted the calliper. You use some fluid, but you can add when finished. 6)You either need one of those brake calliper tools that you push the calliper in with and If you don't have the trick new one with the keys to turn the brake calliper cylinder, you can get by with the old version like I did and use a pair of channel locks to turn counter clockwise, while continuing to turn the tool. The cylinder needss pressure on it while you turn. This will put in in the proper place. 7) Ensure you have the slots up and down so that the pin in the pad fits up into the cylinder. you know this is correct when you have it perfect vertical and center within the calliper. Pay attention when taking off! 8) Set the brake pads in their proper place and then slide the calliper over them. IT should go over freely or else you need to turn more on the cylinder. 9) Tighten the bolts and replace the tire and you are done. Next side!
Hope this helps. -Dave @ firstname.lastname@example.org
Posted on Jan 19, 2009
Your A8 and new shape A6s with electric parking brakes require an electric input to the vehicle to tell it to wind back the pistons/pads. Main dealers have this on their diagnostic equipment. You can also purchase after market tools that just do this operation, heres an example
I have only ever used a main dealer machine so im not sure how good an after market one will be. Im not aware of anyway of doing the job without an electrical input to wind back the pads, the motors are very powerful so I wouldnt reccommend trying it manually. Hope this helps.
Posted on Mar 15, 2009
The caliper piston has to be turned clockwise as it is compressed. If not,it will not retract. This will allow the park brake to reset. If you have only pressed the caliper in with a "C" clamp,you may have damaged the mechanism inside the caliper. If this has happened,you will need to replace them.The OTC #206-026 is the tool for turning the caliper back into the bore. I hope this helps,if you need more information,drop me a line. Thanks,Chuck
Posted on Feb 08, 2010
The rear calipers on these models require a special tool that compresses and turns the piston in at the same time -- most parts stores carry this tool.
It is called a caliper piston press -- and it installs where the pads would go and acts like a c-clamp,when turning handle it will turn the caliper piston backinto the caliper as it compresses it.
Anytime the brake rotor or brake pads are being replaced, the rear caliper piston must be seated (bottomed) to compensate for the new brake rotor or lining. Because the Parking Brake self-adjuster mechanism is attached to the piston, a special seating method is required. The only acceptable method is by rotating the piston back into the bore using Retractor,MILLER Special Tool 8807, . Any other seating method will damage the self-adjuster mechanism.
Good luck and hope this helps.
Posted on Mar 07, 2010
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