rear brake piston rubber boots

Was there a thread somewhere discussing torn rubber boots on the rear pistons? I've been lubricating mine with WD40 when I need to push them back in, but I guess I tore one somehow.

Are there rebuild kits? Can the Ford dealer replace them (under warranty perhaps?)

Whats the downside to running with a torn boot for a while before I can get it fixed? Next track day is Wednesday and I just discovered the damage putting the track pads on tonight.

I have the same problem and Ford's only solution is to buy a new caliper! (Yes, I checked again two weeks ago and it was still the same). I'm in to my brakes regularly and keep the piston clean so it isn't a real problem for me, but for most people you will get corrosion over time which may cause leakage when (if) you need to replace pads.

YMMV,
<TED>

I just changed my rear pads and noticed cracks/tears in both the rear boots. Was looking on rock auto and found a remanufacturing kit. No pics though so hard to tell what it all includes. https://www.rockauto.com/en/catalog...759,brake+&+wheel+hub,caliper+repair+kit,1720

Also saw the optimum performance sells new caliper with high temp silicone boots. https://www.opmustang.com/store/p238/2015-2017_Mustang_Performance_Pack_Rear_Caliper_Kit.html

My solution was to buy a set of take-off calipers off of Ebay. They were only $50 + shipping and when they arrived they were in like new condition.
If Ford sold a rebuild kit, I doubt it would be much less than $50 and then you still have to rebuild them. Seems extreme to replace a caliper for just a torn dust boot, but it actually made sense and cents for me in the end.

Both of my rear caliper boots were torn. I opted for the kit from Optimum Performance, had a great experience with them. They even took back the old calipers for a core refund.

I had both of my calipers replaced by Ford and the new ones had a better boot.

Make sure to turn off advancetrac (hold traction control off for 5 seconds). Advancetrac uses the rear brakes excessively and causes them to overheat and melt the boots.

I lubricate mine with silicone grease. I've been told that WD40 causes the rubber to deteriorate and tear after prolonged use.

FWIW that is just a "dust" boot. There isn't fluid directly behind it. It probably wont leak fluid for a long time after the boot is torn. I wouldn't worry too much.

viva_brasil said:

Make sure to turn off advancetrac (hold traction control off for 5 seconds). Advancetrac uses the rear brakes excessively and causes them to overheat and melt the boots.

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That’s backwards thinking. I don’t personally run with any of the nannies on, but if someone did need stability control to stay safe at the Track, dust boots be damned, please leave it on.

The Carlson parts on Rock Auto are actually high quality. I bought some for the rear on my ‘09 GT500.

NightmareMoon said:

That’s backwards thinking. I don’t personally run with any of the nannies on, but if someone did need stability control to stay safe at the Track, dust boots be damned, please leave it on.

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Too bad AdvanceTrac can't tell the difference between a newbie who's just stepped past his depth (and A-T's threshold) and a more experienced driver who's simply running enough harder to where any more heat going into the calipers is a bad thing.


Norm

ahl395 said:

FWIW that is just a "dust" boot. There isn't fluid directly behind it. It probably wont leak fluid for a long time after the boot is torn. I wouldn't worry too much.

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The boots are there to keep dirt and grit away from the piston seals. More an issue on a street car that sees use in the winter but not a big deal on a track car.

When I used remans on my racecar the boots usually melted/burned off during the first weekend. When I rebuilt them myself, I left the boots off.