Dust boots cracked

p66 · 03-15-2014, 04:02 PM

Anyone else experiencing damaged brake piston dust boots? This is a pic of my rear caliper. Both rears are cracked. Fronts still look fine. Which I find odd since my pad wear would indicate much more energy in the front as expected. I use PFC-08 front and back on the track and I go through pads at a ratio of about 2.5 sets of fronts to 1 set of rears. And I'm not super hard on brakes. Never experienced any fade, even on tracks known for eating pads/brakes.

What problems will I experience if I don't replace the dust boots? Is this a critical issue? Going to COTA next weekend. Want everything in tip top shape.

ayao · 03-15-2014, 09:29 PM

There's some pretty good discussion about dust boots on the E92 M3 Brake forum. Scroll down midway down the page at the following link:

http://www.m3post.com/forums/showthread.php?t=921567&page=4

p66 · 03-15-2014, 10:21 PM

Thx. I'll check it out. Should have searched first.

TXmtrhed · 03-16-2014, 08:33 PM

Those dust boots will be okay for the track. If you replace them and want to keep them from melting again and give yourself some extra margin against boiling your brake fluid get some Ti brake pad insulators.

p66 · 03-16-2014, 08:53 PM

I'll check those out. Thx

HP Autosport · 03-26-2014, 11:51 AM

Looks like heat damage.

Titanium backing plates will help and so will more air flow to the brakes.

robertm · 03-26-2014, 12:06 PM

Will be fine but you don't want to put new pads on and push the piston back in. As long as you keep pushing the piston out (under braking) then no chance of contamination. When you put new pads on you'll want to do a brake caliper job. It's really easy to do and new boots are cheap. Pull caliper, cap fluid line, pop piston, clean using a brush and brake fluid then reassemble with new boots.. Once all reassembled do a good fluid flush to get all the air out of the calipers.

03-15-2014, 04:02 PM	#1
p66 First Lieutenant 56 Rep 348 Posts Drives: 1M Join Date: May 2011 Location: Dallas, Texas iTrader: (2)	Dust boots cracked Anyone else experiencing damaged brake piston dust boots? This is a pic of my rear caliper. Both rears are cracked. Fronts still look fine. Which I find odd since my pad wear would indicate much more energy in the front as expected. I use PFC-08 front and back on the track and I go through pads at a ratio of about 2.5 sets of fronts to 1 set of rears. And I'm not super hard on brakes. Never experienced any fade, even on tracks known for eating pads/brakes. What problems will I experience if I don't replace the dust boots? Is this a critical issue? Going to COTA next weekend. Want everything in tip top shape. Attached Images
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03-15-2014, 09:29 PM	#2
ayao Thread killer 642 Rep 1,896 Posts Drives: 1M Join Date: Aug 2011 Location: CA iTrader: (2)	There's some pretty good discussion about dust boots on the E92 M3 Brake forum. Scroll down midway down the page at the following link: http://www.m3post.com/forums/showthread.php?t=921567&page=4
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03-15-2014, 10:21 PM	#3
p66 First Lieutenant 56 Rep 348 Posts Drives: 1M Join Date: May 2011 Location: Dallas, Texas iTrader: (2)	Thx. I'll check it out. Should have searched first.
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03-16-2014, 08:33 PM	#4
TXmtrhed First Lieutenant 37 Rep 381 Posts Drives: VO 1M Join Date: Aug 2010 Location: Katy, TX iTrader: (0)	Those dust boots will be okay for the track. If you replace them and want to keep them from melting again and give yourself some extra margin against boiling your brake fluid get some Ti brake pad insulators. __________________
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03-16-2014, 08:53 PM	#5
p66 First Lieutenant 56 Rep 348 Posts Drives: 1M Join Date: May 2011 Location: Dallas, Texas iTrader: (2)	I'll check those out. Thx
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03-26-2014, 11:51 AM	#6
HP Autosport Supreme Allied Commander 3837 Rep 54,339 Posts Drives: F80 M3 Join Date: Mar 2007 Location: Santa Barbara, AP, Brembo, GIAC, Koni, Ohlins, Performance Friction, www.hpautosport.com iTrader: (36)	Looks like heat damage. Titanium backing plates will help and so will more air flow to the brakes.
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03-26-2014, 12:06 PM	#7
robertm Major 450 Rep 1,358 Posts Drives: 2020 M2 Comp Join Date: Oct 2007 Location: dfw iTrader: (0)	Will be fine but you don't want to put new pads on and push the piston back in. As long as you keep pushing the piston out (under braking) then no chance of contamination. When you put new pads on you'll want to do a brake caliper job. It's really easy to do and new boots are cheap. Pull caliper, cap fluid line, pop piston, clean using a brush and brake fluid then reassemble with new boots.. Once all reassembled do a good fluid flush to get all the air out of the calipers.
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