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The knuckle could be heli-coiled if the damage is not too bad. If the stripped threads are on the caliper, replace the caliper.
I also have a 2000 grand Cherokee Laredo. Just changed front pads, and it is a torx bit T45. I couldn't find this answer on the web, so I bought several sizes to find out.
.The 2000 Chevrolet Monte Carlo brake caliper bolt size is 9/16. The brake caliper bolt can be purchased at most auto-parts stores
The Rear Caliper Bottom Bolt head size is 12 mm. The Top bolt is enclosed only making it a slide bolt therefore you cant and really have no need to remove it. So the only bolt you should remove is the bottom 12mm head bolt. Then there will be a 14mm bolt that will hold the Emergency Brake Cable Bracket to the Caliper. Loosen this bolt and remove the Emergency Brake Cable Bracket from the Caliper. Then pry the bottom of the caliper up off the disc. This will allow you to swing the caliper up then push the caliper back to slide the caliper off the enclosed bolt slide at the top of the caliper. This will allow access to the inside and outside pads to remove them and allow you to press and rotate the Piston (Push and Twist-in Pistons) back into the Caliper with the right Brake Caliper Compression tool. The rear two Caliper Bracket bolt head sizes are 18mm. You must remove the Caliper bracket in order to remove the rear brake disc. The Front Brake Caliper Bolt is a 3/8" Allen head bolt. There will be two bolts holding the front calipers to the Spindle. The Front calipers are standard push-in Pistons.
brake caliper bushings are the rubber mounts that sit inside the caliper bolt holes. They help guide the bolts when bolting the caliper up to the caliper bracket.
A 3/8" Allen wrench will remove that bolt on the front caliper.
eat it
That's the brake fluid bleeder and it should be on top of the caliper. If it is on the bottom you have the left and right caliper mixed up.
1. Remove the brake hose to caliper bolt from the brake caliper. 2. Remove the brake hose from the brake caliper. 3. Remove and discard the 2 copper brake hose gaskets. These gaskets may be stuck to the brake caliper and/or the brake hose end. 4. Cap or plug the opening in the brake caliper and the brake hose to prevent fluid loss and contamination. 5. Remove the 2 brake caliper pin bolts. Remove the park brake cable from the caliper. 6. Remove the brake caliper from the brake caliper bracket.
Take the caliper to a machine shop and have the broken bolt removed or just replace the caliper. If you do not understand the bolt sizing, you are not equipped to retap the caliper.
The brake hose is connected to the caliper with a special hollow bolt. There are also two copper washers used, along with rings on the bolt and the parts, to seal the brake fluid in a high pressure fitting.
The size is probably an half inch bolt to 3/4 bolt.