Brake caliper failures and how to prevent them

[volvolugnut]

If you must chase the threads of a blind hole, such as the caliper fitting, use an old fitting (or bolt) or new spare fitting. Cut a couple slots about 0.06 inch deep into the threads, add grease and turn the fitting into the caliper. The modified fitting will act as a tap and cleanup the threads. The grease will lubricate the process and hold any cuttings.
volvolugnut

[erikv11]

This has been posted about extensively the last few years but to recap here:

Factory P80 calipers have nearly immortal (!) stainless steel slide pins. On even the most rusted, shot factory calipers the slide pins are usually fine, probably could use a de-greasing and light sanding (and re-greasing with e.g. SIL-glyde).

On the other hand, rebuilt calipers all come with shiny, brand new, pot metal slide pins that quickly corrode and will soon cause the calipers to stick, probably before the caliper has any sticky piston issues.

Test with a magnet: stainless slide pins are non-magnetic, the junk ones are magnetic.

And from any crusty old factory caliper you come across, save the slide pins!

[abscate]

Thanks for the repost of that knowledge , Erik

viewtopic.php?f=1&t=90075

[jreed]

I just popped a new set of ATE 604033 pads into my old ATE rear calipers. The boots on the pistons are definitely past their prime... loose, gooey rubber that has some breaks and splits in it similar to the photos above. I was able to press the pistons all the way back into the calipers, so they're not frozen yet but I'm going to replace the calipers... checking out the NAPA adaptive one rebuilt front ATE calipers you linked earlier, it looks like the rear calipers are available for about $80. Have you tried/tested the Napa adaptive one rear calipers? If so, what's your experience/opinion please?
https://www.napaonline.com/en/p/CALSE22 ... sionRank=1

Screen Shot 2023-06-04 at 14.30.08.png (1.67 MiB) Viewed 556 times

[wheelsup]

I just popped a new set of ATE 604033 pads into my old ATE rear calipers. The boots on the pistons are definitely past their prime... loose, gooey rubber that has some breaks and splits in it similar to the photos above. I was able to press the pistons all the way back into the calipers, so they're not frozen yet but I'm going to replace the calipers... checking out the NAPA adaptive one rebuilt front ATE calipers you linked earlier, it looks like the rear calipers are available for about $80. Have you tried/tested the Napa adaptive one rear calipers? If so, what's your experience/opinion please?
https://www.napaonline.com/en/p/CALSE22 ... sionRank=1

Screen Shot 2023-06-04 at 14.30.08.png

Where are you in Raleigh??? Can I come help lol. My car is in the same position. Just replaced rear rotors and pads but the boots on the pistons look pretty bad, it's only time.

viewtopic.php?t=102448

Were you able to move the brake line nut? I tried, but it started stripping so I backed off. Originally I planned on doing the calipers at the same time.

BTW last time I touched the brakes was in 2007. Here is the brake fluid (not sure why it's sideways, sorry):

IMG-2176.jpg (256.64 KiB) Viewed 544 times

[abscate]

Ooof, that’s nasty looking. Volvo says replace every 3years/30k miles

[wheelsup]

Ooof, that’s nasty looking. Volvo says replace every 3years/30k miles

Yeah, I'm sure. When bleeding all sorts of nasty boogers came out. Doing it every few years would also help exercise the bleed screw and ensure it doesn't weld into the caliper.

I tried using a vacuum pump to suck it out but gave up, making it a two man job. Wife helped.

[jreed]

Would appreciate advice from the group on where to source the brake line nut (and part number) for the rear brake lines... Thanks in advance!

[abscate]

You buy the NiCopp and fittings from Amazon…

I like the “Stop Shop”

https://www.amazon.com/gp/product/B01KN ... UTF8&psc=1

https://www.amazon.com/gp/product/B07BN ... UTF8&psc=1

[FireFox31]

Have you tried/tested the Napa adaptive one rear calipers? If so, what's your experience/opinion please?
https://www.napaonline.com/en/p/CALSE22 ... sionRank=1

I updated my recommendation for the NAPA calipers on this thread's first post. I added a draft of boot replacement info to this post. Sorry it's still in draft form. I really want to finalize this when I get some time.