Upper one is For 996TT front

Porsche 996 Calipers

take away the external seal by prying it out for the caliper housing.If your vehicle is pulling to one side when braking, then there is a high probability that you might have a sticky caliper that needs rebuilding. The rebuilding procedure is truly lots easier than a lot of people think. It fundamentally involves removing the caliper, cleaning it, after which reinstalling most of the components with brand new seals. Frequently, the most challenging area of the task involves really eliminating the caliper through the automobile.

The initial step is always to jack up the car and take away the caliper. Refer to Project 55 for details on the removal of the caliper from about the braking system disc. Refer to Project 54 to get more details on disconnecting the braking system line from the caliper.

Once you have the caliper free and clear through the automobile, take it over to your workbench and commence the disassembly process.

The initial step will be eliminate each one of the four pistons from calipers. One method of elimination is to utilize compressed air to blow out of the piston. Using a small screwdriver, remove the dust boot that surrounds the piston. Place a tiny block of wood during the caliper to avoid the pistons from flying out from the caliper. Blow compressed-air through the caliper bleeder opening to force the piston out-of its chamber. Start little by little boost force through to the piston reaches the block of timber. Be sure that the piston doesn't come completely regarding its chamber. Following the piston is far enough out, you need to be capable of getting a grip on it with your fingers. Be careful when working with the compressed-air, because it's more powerful than it appears and that can make the pistons abruptly fly from the caliper unexpectedly.

Utilizing a cloth to guard the sides of each and every piston, carefully remove all of them through the caliper using either the hands or a big set of vise grips. Make sure that you don't touch the sides of this pistons with any metal resources, as you don't want to scrape this area.

In the event that piston is frozen, then more radical ways of treatment might be essential. Making use of a block of timber, you can try beating the 50 % of the caliper on the market of lumber before piston begins to fall-out. In the event that piston starts to come-out and then gets caught, drive it back completely and attempt again. Fundamentally, the piston should emerge from the caliper 1 / 2. Another strategy is to use the car's brake system to discharge the pistons. Reconnect the caliper toward vehicle and have now an assistant pump the brake system to make from piston.

Once the pistons were removed from the caliper, very carefully clean both inside and outside associated with caliper making use of braking system cleaner or any other proper solvent. The passages must certanly be blown out with compressed-air, and it is a good idea to allow whole system sit in some components cleaner overnight. If the piston or even the within the caliper is poorly corroded or pitted, then caliper should-be replaced. A little bit of surface rust is okay-this should-be refined off utilizing a coarse cloth or some Scotch-Brite. Make sure that you thoroughly scrub from entire within the caliper in addition to piston so that they are perfectly clean.

After the caliper and piston happen cleaned and generally are dry, coat the caliper and piston with silicone polymer system lube. If you don't have this silicone installation lube useful (it's available from PelicanParts.com), after that make certain you coat the whole construction with clean braking system substance. Aren't getting any lubricant or brake liquid on the dirt boot.

Insert the brand new piston seal in to the inside the caliper piston groove. It should fit effortlessly inside groove, yet stick out only a little. Make sure that you wet the seal with some braking system substance ahead of set up. Now install the dirt boot onto the piston, so your side of the boot fits to the inside groove associated with piston. After that, insert the piston somewhat to the caliper. It will slip in easily-make certain it doesn't get cocked. Push the piston completely to the caliper. While the piston achieves the inner O-ring, you will encounter some opposition. Make sure that the piston doesn't become cocked while you place it. When you yourself have difficulty inserting the piston into the caliper, you might lightly touch it with a plastic hammer or make use of a tiny little bit of timber to compress the piston into its home place within the caliper housing. Eventually, ensure that the external rim of seal mates precisely featuring its groove inside caliper housing.

Install the braking system pads (Pelican Technical Article: changing Porsche 911 Carrera Brake Pads), and remount the caliper straight back onto the vehicle. Bleed the braking system system (Pelican Specialized Article: Bleeding Porsche 911 Carrera brake system), and you ought to be great going. Be sure that you very carefully look at the brakes regarding car just before do any significant driving.

Figure 1

Take away the external seal simply by prying it associated with caliper housing. The brand new seals tend to be set up in reverse fashion, but may require some finesse work to have them properly sitting inside their grooves.

Figure 2

The most effective method i have found for getting rid of the caliper pistons is to utilize compressed air to strike them away. Beware though-start with low pressure and then boost it if it's inadequate. It really is much easier than you might think to deliver your pistons flying over the room with 100 psi of environment pressure!

Figure 3

Make certain you replace the inner piston seal. This seal is really what keeps braking system fluid from leaking down beyond the cylinder. Additionally be certain you cleanse the entire inner cylinder for soil, debris, and corrosion. Never scrape the inside for the caliper cylinder while you are working on it or you might have problems with the caliper leaking when you reassemble it.

Source: www.pelicanparts.com
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