Rear caliper brake arms : Warning / education

Tom F&L GoR

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The non-ABS rear calipers have a left and right side. Internally, they are also left and right, since the calipers are mirror images of each other. However, the bolt attaching the brake arm is always right hand.

What this means is that you can safely rotate (tighten) the parking brake arm bolt by using a wrench towards the casting, but not away from the casting. If you need to rotate (tighten or loosen) away from casting, use visegrips or something to hold onto the arm itself. Do not rely on the internal parts to hold against your wrench.

The internal parts can't be purchased. The broken parts may be the plastic cage for the ball bearing or the snap ring against which the parking brake mechanism pushes and pulls against the engage and disengage. In all cases, the caliper will still behave as a hydraulic brake, but not a mechanical one.

Here is an example of the snap ring when it gets pulled through. If it is not flat, the symptoms are that the piston will not retract when rotating it with the dimples, nor will it extend when rotating the brake arm.

pulledthrough.jpg


The brake arm is not that stiffly sprung that you can't rotate it with a glove on your hand. Also, for similar reasons, when removing the caliper, please don't even take the arm off; use pliers to pull on the ball end of the parking brake cable and unhook it from the arm. It's easier than it looks.

Dodge charges $450 per caliper. Yes, you can screw me by sending them in as cores. If I have extra parts (not always likely) I'll be OK, but if not, it's a caliper I can't rebuild. But it's just as easy not to do it in the first place.

I'm available for any questions about these calipers. Just because Dodge didn't put instructions in the service manual doesn't mean we can't fix 'em.
 

Catwood

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ok...so when I change pads.

When I change pads I screw the piston in. Then I rotate the Ebrake arm a few times to tighten up the pad/rotor clearance.

Then when it everythings together and before I put on the wheels I pull the ebrake handle a few times with the button in.

I think start the car while on stands and get a feel of the brake pedal. If it feels good I put the tires on and do a quick test drive and bed the pads.

I've been doing this for some time as I switch back and forth street/track pads. So far no issues.
 
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Tom F&L GoR

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Yup. I just want to take everyone's 13mm socket away when they do brake work so there's no accidental use of the bolt head instead of the ebrake arm. Anything you need to do can be done by hand or by moving the arm, no need to take the arm off.
 

Martin2000GTS

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So I decided to replace by rotors and pads yesterday, and of course open up a can of worms, first a broken front driver side knuckle (where the lower bolt connects to the caliper) so I order one of those, then to take that off I broke the lower boot of the ball joint, so ill need one of those.....So while im waiting for the parts to come in I attack the rear calipers and pads (easy work for me). Driver side rear goes fine, use the needle nose plyers to turn piston in no problem. Now onto the passenger side, the piston wont retract, it just turns forever....am I experiencing a problem seen above? My calipers are "toms 40mm rear caliper" upgrade and i believe they are only about 3 years old. Anyone chime in with why the piston wont retract? It turns clockwise fine, but just wont retarct like the drivers side did....any help is much appreciated!
thanks
Martin
 

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