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Makes absolute sense that it is a caliper piston. The noise occurs suddenly as if something frees or shifts. Not an aggressive action at all but mildly annoying. It will be less annoying now that I have an idea what is happening.
exactly, "as if something frees" is it. The "pop" is the piston "popping" under fluid pressure.
I got a pair of "lifetime warranty" calipers at Autozone, called my local mobile mechanic, replaced everything, bled the system, and done. (also did new rotors, wheel bearings, brake fluid, front brake hoses, & pads). Parts & labor less than $240. Paid $23.00 for each rotor, Made in China but these were very high quality in my opinion. I've seen El Cheepo rotors before.
Makes absolute sense that it is a caliper piston. The noise occurs suddenly as if something frees or shifts. Not an aggressive action at all but mildly annoying. It will be less annoying now that I have an idea what is happening.
Furthermore, as 96_4 described the possibilities of such "popping"-Noise the Point: brake pad binding, dry rusty slide pins and slide grooves, makes alot of Sense to me, because the old Calpiers i've replaced were completely stuck. Slide-Pins rusty and dry, the Groves as well. To wirebrush and clean the Groves and lubricate (Hi-temp Grease) Groves and new Pins before reassembling is an important Step. I've found a Post here where Lubrication of the Pins is recommended every 15tsnd miles(!). I will keep an eye on this from now on.
Replacing Calipers/Pads/Lines is far more easy then overhauling the rear Drumbrakes. I choose remanufactured CARDONE Calipers, equipped with Phenolic Pistons and Semi-metallic Pads. Copper Washers, Pins and Anti-rattle Clips are included but not the Pinhole-Screw (whats the right name for this?). That one has to be reused from the old Caliper.
In my mind's eye I have always pictured a brake pad shift as the cause of the noise. More like a soft "clunk" than a pop. It's not consistent and happens typically at the end of braking as the steering wheel is turned. After checking them over I have dismissed the idea because I couldn't find or create the slop that would be the problem source.
I do like the idea of re greasing the pins on a schedule. It sure can't hurt, costs nothing and would get me to inspect the front brakes more often.
In my mind's eye I have always pictured a brake pad shift as the cause of the noise. More like a soft "clunk" than a pop. It's not consistent and happens typically at the end of braking as the steering wheel is turned. After checking them over I have dismissed the idea because I couldn't find or create the slop that would be the problem source.
Since the Pads are associated with the Piston, i do agree now with the idea of a sticking Piston as the source. Just had to free my mind's eye too
Aren't phenolic pistons the cause of a lot of caliper problems? When the brakes heat up from extended usage, the phenolic pistons can burn and jam in the bore.
[quote=waterbear;12024003]Since the Pads are associated with the Piston, i do agree now with the idea of a sticking Piston as the source. Just had to free my mind's eye too quote]
I am with you on that and with BR. After having two Aerostar's having the same embarrassing front brake clicking noise, even after installing new (rebuilt) calipers.
It has something to do with the brake pads slopping around and clicking. It occurs near the end of braking, just before the vehicle completely stops.
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