Rear Brakes, Learned something new today....

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San Jose Steve
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Rear Brakes, Learned something new today....

Post by San Jose Steve » Fri Sep 06, 2019 5:59 pm

..... I've been plagued with this persistent but slight "rubbing sound" on my drivers rear disc brake as if the rotor was warped. Really only noticeable if driving along a center divider or curb. I replaced the rotor but still the sound (and slightly dirtier wheel) persisted. Making a U-turn last week it was particularly pronounced.

It was the axle shaft! I replaced the rear diff and must not have seated the snap ring that locks that axle shaft in place. The only thing keeping it from sliding out was the caliper bracket! The snap ring looked to be properly installed, but upon removing the caliper and bracket, I gave axle hub a good tug with both hands and the ring went flying off and the axle shaft slid right out!

Lesson learned. After re-installing an axle shaft, be sure to give it a good tug to see if it comes out in your hands! -San Jose Steve
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miker
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Re: Rear Brakes, Learned something new today....

Post by miker » Sat Sep 07, 2019 3:58 am

When people ask me why I became so enthusiastic about Mirafiori almost 25 years ago, I tell them, “Why pay someone when you can screw it up yourself for free?”

I’ve had kind of the opposite experience with the rear axle. 8000 miles ago, I replaced one because the threads had stripped leading to the wheel all but falling off (that’s a noise you can’t ignore!). I actually had to experience it twice because the first time I figured that I forgot to torque the wheel lugs.

Anyway, I replaced the axle and the wheel bearing but had some trouble seating the snap ring, so I whacked the hub with a hammer, hard, to seat the bearing deep enough so that there was a clear groove for the snap ring.

8000 miles or so later, the bearing had failed. Or maybe I just noticed it (too much runout on my brake rotor) and it had failed at the time I banged it.

Over on Facebook, there is an account from Midwest 124 about an old Fiat where one of the four alternator bolts was left out, leading to the alternator eventually working loose, whacking some other part, which led to poor cooling of the engine which basically ruined the pistons, and a bunch of other stuff. The ‘mechanic’ presumably had been paid. So we keep on keeping on, living and learning.
MikeR (mirafiori.com since 1995)


1977 Fiat 124 Spider
Previously owned:
2012 Fiat 500 Prima Edizione #236 (now owned by my son David)
'86 Bertone X1/9
'81 Fiat Spider 2000 #236
'78 Fiat 131 four door
'76 Fiat 128 4 door
'74 Fiat 128 4 door
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