Z4M Front Brake Caliper Bolt Torque

elerner61 · 08-06-2013, 01:10 PM

I've got a varying rubbing, sometimes screeching noise coming from my front passenger side wheel and need to take a look tonight. Has anybody got quick access to the torque specs for the 7mm bolts? I want to take the pads out of the equation and spin the rotor free to do a quick check of what's what. It may be a bearing (which I don't feel like changing) but I want to make sure first. Thx.

The HACK · 08-06-2013, 01:11 PM

30Nm, ~25 ft*lbs.

elerner61 · 08-06-2013, 10:16 PM

Thanks. Bearing is fine. Some debris (e.g. small piece of edge of one pad) dropped out when I pulled off the piston/pads so that may have been it. I cleaned and greased up the pins and slapped it back together. Sounded fine on a quick 10 minute run to get ice cream. We'll see what comes.

The HACK · 08-06-2013, 10:42 PM

You shouldn't grease the pins.

elerner61 · 08-07-2013, 07:32 AM

You know, I wasn't 100% sure about that. Why not on our pins?

Thanks for the follow up.

Blind32 · 08-07-2013, 09:12 AM

I greased my pins and I got grease all down the side of my car after a good rain. Was a pain to clean off. Curious why not to grease BMW Pins also. Have always greased pins on other cars. Is this wrong for all cars or just BMWs?

inTgr8r · 08-07-2013, 09:39 AM

Quote:

Originally Posted by elerner61

You know, I wasn't 100% sure about that. Why not on our pins?

Thanks for the follow up.

Pins are polished smooth and designed to operate dry.

No grease, because dust and dirt become embedded and then its an abrasive that will score the pins and jamb them up.

elerner61 · 08-07-2013, 10:20 AM

I've been reading up on the other Bimmer forums and many folks including full time mechanics believe the "no grease" edict is because BMW is fearful people wont use the proper lubricant and will end up swelling (can that be used as a verb?) the bushings. Many mechanics say they have been lightly using sylicone based pin lube (Sylglide).

The HACK · 08-07-2013, 10:28 AM

BMW specifically said no grease in their TIS repair procedures. You're free to do what you want, of course, but the pins are designed not to require grease...Hence the rubber sleeves.

If it was a brass bushing the pins are sliding on, then yes I'd grease it.

elerner61 · 08-07-2013, 10:32 AM

What are the bushings made of? (and what are the pin/bushing materials commonly used in applications where a lubricant is recommended). Just trying to learn something (not be a wise ass).

The HACK · 08-07-2013, 10:38 AM

OE bushings are simple rubber I believe. You would only use lubricant if it's metal on metal, like a brass bushing kit.

08-06-2013, 01:10 PM	#1
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	Z4M Front Brake Caliper Bolt Torque I've got a varying rubbing, sometimes screeching noise coming from my front passenger side wheel and need to take a look tonight. Has anybody got quick access to the torque specs for the 7mm bolts? I want to take the pads out of the equation and spin the rotor free to do a quick check of what's what. It may be a bearing (which I don't feel like changing) but I want to make sure first. Thx.
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08-06-2013, 01:11 PM	#2
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	30Nm, ~25 ft*lbs. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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08-06-2013, 10:16 PM	#3
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	Thanks. Bearing is fine. Some debris (e.g. small piece of edge of one pad) dropped out when I pulled off the piston/pads so that may have been it. I cleaned and greased up the pins and slapped it back together. Sounded fine on a quick 10 minute run to get ice cream. We'll see what comes.
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08-06-2013, 10:42 PM	#4
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	You shouldn't grease the pins. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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08-07-2013, 07:32 AM	#5
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	You know, I wasn't 100% sure about that. Why not on our pins? Thanks for the follow up.
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08-07-2013, 09:12 AM	#6
Blind32 Certified Adrenaline Junkie 43 Rep 1,325 Posts Drives: '07 Z4MC Join Date: Sep 2009 Location: Dallas TX iTrader: (2)	I greased my pins and I got grease all down the side of my car after a good rain. Was a pain to clean off. Curious why not to grease BMW Pins also. Have always greased pins on other cars. Is this wrong for all cars or just BMWs?
	Appreciate 0 Quote

08-07-2013, 10:20 AM	#8
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	I've been reading up on the other Bimmer forums and many folks including full time mechanics believe the "no grease" edict is because BMW is fearful people wont use the proper lubricant and will end up swelling (can that be used as a verb?) the bushings. Many mechanics say they have been lightly using sylicone based pin lube (Sylglide).
	Appreciate 0 Quote

08-07-2013, 10:28 AM	#9
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	BMW specifically said no grease in their TIS repair procedures. You're free to do what you want, of course, but the pins are designed not to require grease...Hence the rubber sleeves. If it was a brass bushing the pins are sliding on, then yes I'd grease it. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
	Appreciate 0 Quote

08-07-2013, 10:32 AM	#10
elerner61 Major 157 Rep 1,107 Posts Drives: '07 Z4M Roadster Join Date: May 2011 Location: Mount Kisco, NY iTrader: (0)	What are the bushings made of? (and what are the pin/bushing materials commonly used in applications where a lubricant is recommended). Just trying to learn something (not be a wise ass).
	Appreciate 0 Quote

08-07-2013, 10:38 AM	#11
The HACK Midlife Crises Racing Silent but Deadly Class 1821 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	OE bushings are simple rubber I believe. You would only use lubricant if it's metal on metal, like a brass bushing kit. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
	Appreciate 0 Quote