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Old Mar 29, 2014 | 05:41 PM
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S. Artee
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Default Re: Yet Another AMG Brake Upgrade How-To

Got around to completing the install for the rear this weekend. Wanted to be finished a lot sooner, but that's how it goes...


Here's a look at the stock SRT rear rotor vs the new unit. I noticed while removing the stock discs, they're actually imbued with AMG's logo on the exterior of the brake hub/hat, neat stuff since I was almost sure that Chrysler would have at least outfitted their own supplier for this part.

Oh and as a bonus, these rotors match the retaining screw location so they'll actually hold themselves up when installing.





During this install, I found this little label hiding under some stickers. This is the box that shipped from CARid... Sneaky-sneaky! Looks like I'll just go directly to MB next time, or perhaps I can find these rotors through a cross-reference on say an E55 or whichever model around the R171 era used a 330mm rear disc.




Installing the rear calipers: Now here's something fun, the brake line input for the calipers is such that if you were to install the units backwards (exchange left for right), the line feed is DANGEROUSLY close to the ground. I mentioned earlier that this "How-To" assumed certain knowledge on the part of the DIY'er, however I want to reinforce that your brake lines should have free travel (as they move relative to your suspension). And if your lines don't look like this, then you installed the calipers backwards.




When installing/bleeding the new units, you might note that it's physically impossible to bleed all the air out with the nipple located in the south position (air floats!). To combat this, simply connect your lines, let the caliper gravity bleed (set it on the floor with the bleeder valve open) until fluid starts running out. After this, hold the caliper by hand, upside down (valve is now north) and use your vacuum bleeder to pull the rest of the air out. Make sure your pistons are fully depressed into their cylinders. If done correctly, 100% of the air comes out and your pedal will be nice and solid.



Something interesting happened during the shakedowns... Heard this weird clicking coming from the rear, somewhat like the sound the hatch lock makes when engaging. Rooted around and found that on the passenger side, the line fitting slipped through on the body side. This hasn't happened on any of the other wheels, which is odd. I'll mock up something to fix it. Not sure if it's a fluke, but I'd watch for this on your install just to be safe.



EDIT: Simply needed to reseat the female coupling into the bracket, all is well.


All of that said, the front and rear brakes are on! Wow!! The ferocity of the big pedal now matches the skinny one. Truly a massive upgrade.
 

Last edited by S. Artee; Mar 31, 2014 at 10:46 PM.
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