Take the new pads and chamfer the edges off as shown in the photo. This is the sharp edge of the new pads hanging up on the rotor. New pads will chatter and cause vibration and sometimes violent shaking. If they need replacement I use Aimco rotors that I get at Autozone. Sometimes turning can fix a warped rotor but it may need to be replaced. You might also feel a pulsing in the brake pedal. Warped rotors are caused by overheating and will wobble when rotated. Turning the rotor removes material making the rotor thinner and eventually weak enough to require replacement. The new pads will wear in and conform to a little bit of a rough surface. I've found that it's usually not necessary to turn the rotors. If you run your finger nail over the rotor and can feel deep scratches have them turned. What about the rotors? I only turn the rotors if they are badly scored or warped. If any pad on your truck is thinner then 1/8" all 4 of the pads on the front or rear should be replaced as a set. If you get over your head or find other problems that cause you to get over your head find someone qualified to fix it right, even if it means towing your truck in. Remember, these are your brakes, so there is no room for compromise when repairing them. I am including the pages from the AMG manual on rebuilding calipers for reference at the end of this page. I'm hitting on other subjects because you should be cognizant of other problems for safety reasons. Repairing Brakesįor most of us our rotors are fine, and the braking system is in good shape. With the advent of mass production steel was cheaper to use. It turns out that copper-nickel brake lines are not new. But all said and done it took about 45 minutes to get everything installed and tightened down, The other advantage is not having to ever worry about corroded brake lines. I did need some plastic tube to act as spacers at the clamp. It was very easy to flange,and bending is a dream. With a friend feeding it, I guided it towards the rear unions. To say that this was an easy install is an under statement. After removing all the lines, drivers and passenger I went to the local auto store and found out they have a new material for break lines made out of a copper Nickel alloy in 50ft rolls. I found that the rear driver side brake line was badly corroded and leaking. The steel is hard and takes a lot more effort to form flares on the ends. You have to pre bend them with a tubing bender or they'll kink. You can't just feed them around obstacles. Hard steel lines are like working with steel conduit. One of my readers sent me an email in December of 2014 about a new type of copper-nickel brake line that is much easier to work with than the standard hard steel lines and is inherently corrosion resistant. A 3/8" flare nut wrench is used for most of the fittings, with a 1/2" wrench (flare) also required for the outer fitting on the brake calipers. The brake lines on the Hummer / H1 are standard 3/16" lines with standard double flare fittings. Exposure to the elements, handling a great amount of pressure and moisture in the brake fluid cause these tubes to deteriorate and eventually fail. Through the movement of the fluid, braking force is transferred from the master cylinder to each of the wheels. This steel tube holds the brake fluid that is responsible for making the brakes work. Brake Linesīrake lines are a very important part of a car's braking system. The rear are unique to Hummer because of the parking brake mechanism. You don't even have to remove the front undercarriage protection. On the fronts all you have to do too retract the piston is to squeeze it with a channel lock pliers or use a retracting tool. The only difference is that the rears have the parking brake hardware and require you to turn the piston in order to retract it. The fronts use the same pads as the rears. I'm writing this to show how to do a simple pad replacement on the rear of a Hummer without using the expensive ($350) Kent Moore tool. I've been told that the Hawk brakes are supplied by Porterfield and that Porterfield makes some very good Carbon Kevlar pads. The only way to get these pads is from AMG part number 5745162C.
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