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Old 03-03-2002, 01:01 PM
Mr. BILL's Avatar
Ghoulardi Rules!
Join Date: Aug 2000
Location: Austin, TX
Posts: 576
Renew caliper bolts?

The rotors are warped on my '90 300SE. My Haynes manual says I should use new caliper bolts. Is this necessary? I'm sure they don't cost much, but I wont be able to change them today, (no big deal).

91 300E 120K
90 300SE 275K (sold)
92 BMW 525iM 120K
90 BMW 525iA 175K
85 300D 175K (sold)
84 300SD 245K (sold)
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Old 03-03-2002, 05:00 PM
Registered User
Join Date: May 2001
Location: Charleston, SC
Posts: 237
I posted same question recently after the fact.

The only response I got was from Benzmac stating to use Loctite when putting back on. Not sure, but I don't believe that these bolts are generally replaced in the real world. (At least not by the techs that I asked after my post).

Post any feedback you get elsewhere as this should have been an issue that was addressed by everyone that has ever replaced pads themselves on a sliding caliper setup (esp. if they read a manual at the time (Both of mine recommend bolt replacement)).

Although understanding safety/liability concerns (prudence will dictate advice) I would still invite others to respond on this issue.

Also, additional clarification on strength/color of loctite formula to use would be appreciated (red or blue? Both listed on prior posts on subject (search= bolt caliper)).

Further, are these bolts on Fastlane or Partsshop? If not, does anyone know part #'s for W124 chassis?
2008 GL320CDI 6K
1970 280SL 112K
1982 240D 210K (Sold)
1973 220D 220K (Sold)
1967 200D 160K (Sold)
1992 400E 139K (Sold)
1988 300E 148K (Sold)
1987 300D 257K (Sold)
1991 300E 108K (Sold)
1987 300E 131K (Sold)
1978 300D TMU (Sold)
1980 300D TMU (Sold)
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Last edited by CarolinaMBZ; 03-03-2002 at 05:15 PM.
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Old 03-03-2002, 07:43 PM
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Join Date: Feb 2002
Location: east coast
Posts: 1,255
On my C class the OEM pads come with caliper bolts that have a blue Loctite/anti-seize coating on the threads. There is a specified torque rating for these bolts also.
I don't think this is a case of bolts getting stretched as in head bolts only being used once. I think because of the safety issue with something as important as brakes, these caliper bolts are intended to be installed as close to original spec as possible.
On another list a week or so back, an owner related the story of what happened when a repair shop forgot to tighten the caliper bolts properly. Luckily he was able to diagnose a repair in a hotel parking lot, but the resulting brake failure on the road was bad news.
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