Grub screws

[Griff]

Morning all,

My front brake caliper has two grub screws covering the brake pad retaining pins. These little screws will not budge. Penetrating oil, hammer and punch, and heat have all failed.

Just wondering if anyone has a suggestion before I get the drill out?

Griff.

[Lutin]

Have you tried an impact driver?

Mind you, I would still be careful about using one of those on my own bike.

[btbloke]

I've seen this a few times. The only thing I would advise is always use the best quality,best fitting screw drivers and allen keys at the outset. once the grooves/slots have been butchered with badly fitting screwdrivers and then chisels etc it is a major job to drill out risking damage to the caliper casting. I would say try some butane on it, it makes the grub screw instantly freeze and much colder than the caliper,get a decent screw driver bit that fits tight and give it a good cracking twist with maybe some mole grips or a spanner attached to the screwdriver handle for leverage.
Apart from that good luck with the drill and be careful.

[tramp]

hi
I had to use a impact driver and a good wallop at that, then when replaced used copper slip never had a problem since, what about a small drill as they aint that deep and the alen keys behind them ,then use a easy out.

best of luck cause lack of maintenance

[StumpyFingers]

I think a screwdriver which is tight fitting and a good grip for twisting is best.
If it is like putty then it has had it and will need careful extraction and replacing.

[jasonbc]

I think a screwdriver which is tight fitting and a good grip for twisting is best.
If it is like putty then it has had it and will need careful extraction and replacing.

Got too agree with that most problems i've seen are caused by people using the wrong size screwdrivers and poor quality tools which flare the slot out. When i remove mine i always run tap down the hole and put the grub screw through a die and lag it all with copper / ali ease. Only once i ever had to knock one around with a chisel to ease it out as the head was so badly worn.

[micksylver]

Had this problem myself on the XR - impact driver worked for me.

Also used plenty copper grease on re-assembly as a precaution.

[Alba]

Griff i had the exact same problem as you, i tried an impact hammer and it took a chunk off the cap screw i eventually got them out using a 'extraction screw', can not remember the exact name basically it's a left handed screw which you drill into the head, take it nice and easy. You can get them from screw fix for a couple of £

[jamie92j]

Griff i had the exact same problem as you, i tried an impact hammer and it took a chunk off the cap screw i eventually got them out using a 'extraction screw', can not remember the exact name basically it's a left handed screw which you drill into the head, take it nice and easy. You can get them from screw fix for a couple of £

like this

Rolson 5 Piece Screw Extractor Stud Bolt Tap Remover on eBay (end time 30-Mar-10 18:34:37 BST)

and

Stud Extractor Set 8 Pc - Screwfix.com, Where the Trade Buys

i had this problem before and i used the impact hammer, worked a treat, depends how badly mashed up the head is.

good luck

[BobA]

Ensure you've used penetrating fluid, or a bit of local heat. Pouring boiled water slowly from a kettle onto the caliper area around the cap, but avoiding the cap if possible.

Get a screwdriver with a square shaft, or some of them have a hex section at the base of the handle. THESE ARE THE ONES I HAVE and you can fit a socket wrench on top of them for massive leverage and they have a hex shaft as well. £12.95 for the complete set at QVS




Make sure it fits perfectly in the slot of the grub screw/dust cap

Put a spanner or grips on the screwdriver shaft, lean into it, and turn with all your might!

East peesy lemon squeezy!




Bob