Brake calipers torque specs?
10-29-2016, 04:15 PM
#1
Le Mans Master
Thread Starter
Brake calipers torque specs?
Changing rotors,what torque value is needed for the bolts holding caliper to the hub assembly?
10-29-2016, 05:40 PM
#3
Melting Slicks
[QUOTE=RicK T;1593357746]23 ft/lbs and use blue Loctite.
No, 23 is for the caliper pins. Torque is 129 for the bolts holding caliper to hub
No, 23 is for the caliper pins. Torque is 129 for the bolts holding caliper to hub
10-31-2016, 02:59 PM
#5
Melting Slicks
Just a suggestion from personal experience.
Do not use 3/4" impact (or larger) to snug up the caliper mounting bolts. Even if your impact is rated for <125 ft /lbs of torque it can still generate enough force to break the caliper bolt retaining sleeves loose in the caliper body.
Hand-tightening is your friend (in this case).
Do not use 3/4" impact (or larger) to snug up the caliper mounting bolts. Even if your impact is rated for <125 ft /lbs of torque it can still generate enough force to break the caliper bolt retaining sleeves loose in the caliper body.
Hand-tightening is your friend (in this case).
10-31-2016, 04:58 PM
#6
Le Mans Master
Thread Starter
Just a suggestion from personal experience.
Do not use 3/4" impact (or larger) to snug up the caliper mounting bolts. Even if your impact is rated for <125 ft /lbs of torque it can still generate enough force to break the caliper bolt retaining sleeves loose in the caliper body.
Hand-tightening is your friend (in this case).
Do not use 3/4" impact (or larger) to snug up the caliper mounting bolts. Even if your impact is rated for <125 ft /lbs of torque it can still generate enough force to break the caliper bolt retaining sleeves loose in the caliper body.
Hand-tightening is your friend (in this case).
10-31-2016, 05:10 PM
#7
Melting Slicks
Not sure how you determined they weren't tightened to that spec at the factory as the force required to remove a bolt is not equal to the force required to install it but I understand if you had some concerns about applying 129 ft/lbs of torque to a bolt that is going in to a threaded steel retainer that is just pressed in to an aluminum caliper.
10-31-2016, 05:14 PM
#8
Not sure how you determined they weren't tightened to that spec at the factory as the force required to remove a bolt is not equal to the force required to install it but I understand if you had some concerns about applying 129 ft/lbs of torque to a bolt that is going in to a threaded steel retainer that is just pressed in to an aluminum caliper.
10-31-2016, 05:28 PM
#9
Melting Slicks
Lots of factors go to difficulty of removing bolts previously torqued to a specific value:
1. Fastener type
2. Use (or lack) of anaerobic locking compound (LocTite)
3. Compatibility of bolt / retainer and the effect of galvanic corrosion
4. Heat/cooling expansion cycles
5. Incorrect torque applied in the first place
In my case I think I was the victim of the previous owner of the car having someone R&I a caliper as part of some service and the guy hit it with a 250 ft/lb 3/4" air ratchet.
1. Fastener type
2. Use (or lack) of anaerobic locking compound (LocTite)
3. Compatibility of bolt / retainer and the effect of galvanic corrosion
4. Heat/cooling expansion cycles
5. Incorrect torque applied in the first place
In my case I think I was the victim of the previous owner of the car having someone R&I a caliper as part of some service and the guy hit it with a 250 ft/lb 3/4" air ratchet.