Sticky rear caliper

Drop the Puck · 12-03-2018, 08:31 AM

Hey Guys,

I have a sticky rear caliper. It happens only occasionally. I pulled drivers side rear tire and took of caliper. Cleaned the slide pins, lubed with high temp. silicone grease which looked and preformed perfectly, checked the dust boot and seals on caliper piston. no leaks, no rips, collapsed and extended without a problem. cleaned brake pad seats" wire wheeled" and dry graphite lubed. Reassembled everything caliper moved freely. Pumped brakes piston extended, not a problem there as I could use flat head screw driver just to push them back...so can't see he piston binding. Drove for 3-4 days all good, the TMPS comes on saying cannot identify leak, I feel all rims and all good except for the sticky caliper...not overly hot where you cannot touch it. My friend says bleed the brakes it will fix the problem as fluid is not returning freely to master?
What do you all think?

Thanks!!

jandref321 · 12-04-2018, 07:30 AM

Confused by the post. Is the real issue your TPMS is malfunctioning? It is winter now so likely that the cold would set off all your sensors. You would need to fill tires to appropriate pressure and reset TPMS.

I’ve had a sticky caliper before that I replaced with remanufactured one. If it’s not hot after driving then not likely the issue and it would not cause a tire pressure sensor warning.

12-03-2018, 08:31 AM	#1
Drop the Puck New Member 3 Rep 7 Posts Drives: 2009 BMW x5 E70 Join Date: Oct 2018 Location: Ontario Canada iTrader: (0)	Sticky rear caliper Hey Guys, I have a sticky rear caliper. It happens only occasionally. I pulled drivers side rear tire and took of caliper. Cleaned the slide pins, lubed with high temp. silicone grease which looked and preformed perfectly, checked the dust boot and seals on caliper piston. no leaks, no rips, collapsed and extended without a problem. cleaned brake pad seats" wire wheeled" and dry graphite lubed. Reassembled everything caliper moved freely. Pumped brakes piston extended, not a problem there as I could use flat head screw driver just to push them back...so can't see he piston binding. Drove for 3-4 days all good, the TMPS comes on saying cannot identify leak, I feel all rims and all good except for the sticky caliper...not overly hot where you cannot touch it. My friend says bleed the brakes it will fix the problem as fluid is not returning freely to master? What do you all think? Thanks!!
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12-04-2018, 07:30 AM	#2
jandref321 Captain 345 Rep 728 Posts Drives: 2012 X5M Join Date: May 2014 Location: United States iTrader: (1)	Confused by the post. Is the real issue your TPMS is malfunctioning? It is winter now so likely that the cold would set off all your sensors. You would need to fill tires to appropriate pressure and reset TPMS. I’ve had a sticky caliper before that I replaced with remanufactured one. If it’s not hot after driving then not likely the issue and it would not cause a tire pressure sensor warning.
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