Front brake caliper Torque Bolt Size

[Skididley]

Hi there, I wondered if anyone can help, I changed my front Discs and pads today, but I had real trouble with getting one ov the torq head bolts out, looks like it's now cross threaded.....can anyone tell me what is the tapping size, as I plan to re tap and fit new bolt....failing that to be helicolied.....😖...... Thanx in advance

[cyclone]

No idea but a thread gauge would be a good investment. Would go for the helicoil rather than trust running a tap in the hole to straighten the threads. That will weaken their ability to hold the torque of the bolt and your brake on. Something you really don't want to come loose.

[Skididley]

Thankyou for your reply....totally agree with you, to be honest at present I don't know if it's the bolt or the tapped fixing point that's at fault, from reading other forums it seems this is quiet common, I've changed lots of brake discs and pads, this is the first time I've experienced this, can't help but think, the amount of loctite was a clue.....

[WTF]

Loctite....... That doesn't sound good......

[colganraz]

Im sure the bolts are set with loctite from the factory. Probably to prevent the bolt from unscrewing itself with vibration

[cyclone]

Im sure the bolts are set with loctite from the factory. Probably to prevent the bolt from unscrewing itself with vibration

They are a chemical additive type of a self locking bolt in that it has a dried blob of locking material on the threads. It is the reason they are classified as one time use bolts. Because after one use there is not enough additive left on the bolt to provide a high enough breakaway torque. The way around it is to just use "loctite" to the bolt before reassembly. "Loctite" is also classified as a chemical additive and provides the same holding power just that it takes longer to apply the correct amount and install than just to install a prepared bolt that each and every time has the correct application of the locking compound. Making the critical bolt installation as stupid proof as possible.