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Discussion Starter #1
I have to renew my driveshaft gearbox oil seals, and the Haynes manual specifies that in removing the front brake caliper, the guide pin bolts have to be renewed and not reused.
Is this necessary and why?
 

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Because they hold the caliper together and have single use thread lock on them. Plus they don't cost much but are safety critical.
 

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normally you get new sets of bolts with new pads. never changed them inbetween but always tighten them more then the haynes manual says

when i did the garage was almost able to undo by hand
 

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You get 2 bolts if it's a Lucas caliper or 1 bolt with replacement pads if it's a Bosch caliper (as you only need to undo one to swing the caliper out of the way to change the pads, but both bolts on a lucas caliper).
 

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Discussion Starter #5
Because they hold the caliper together and have single use thread lock on them. Plus they don't cost much but are safety critical.
thankyou; the manual didnt explain anything about single use thread lock. I gather this material ruins the thread for any reuse?:)
 

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I replaced all pads back in May and didn't replace any bolts or locating pins. All brakes still working fine and have caused the ABS to kick in when numpty's have pulled out in front of me on a couple of occasions. As rustyroger states - you can buy threadlocker from a motor factors which will do the job just as well as the original.
 

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The manual has to cover it's self so works on numpties doing the job hence replace bolts as with thread lock if you forget to fully tighten they will not fall out with thread lock. If you do the used bolts up to correct torque you will be fine.

You can use a SMALL amount of thread lock on used bolts to be 100% but make sure its a small amount or you will struggle to remove bolts when pads need changing
 

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Discussion Starter #9
thankyou all
had already come to the same conclusion; reuse wtih some temperature tolerant loctite and correct torques. Spoke with the local brake / clutch specialists and they said they never replace caliper pins unless worn/damaged.
in the meanwhile have run into the bloody 35mm hub retaining nuts; noone open this weekend had a 35mm socket, even the car parts stores. Will have to go to a tools specialist when open during the week.
Peter (Australia)
 

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You should be able to leave caliper in place and just drop bottom ball joint and disconnect tie rod and drop links should give enough movement to disconnect drive shaft from gearbox without removing hub nut (near side only mid bearing needs removal for off side)
 
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