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Thread: Who owns a ph 4 screwdriver?

  1. 22nd June 2011, 08:49 PM #1
    John W's Avatar
    John W
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    Who owns a ph 4 screwdriver?

    Any one else snookered by those retaining screws trying to change the front brake rotors? Looks like they are a size 4 phillips head now stuffed with my size 3 impact driver. Even my local specialist tool shop could not supply one. I will drill them out tomorrow and try and get some new ones from MR automotive. But why would LR choose those rather than a hex key or even a straight slot head. I suspect that very few of us DIYers have a size 4 phillips screwdriver in our tool boxes. Rant finished, I feel better and hope to get the job done next weekend!
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  2. 22nd June 2011, 09:06 PM #2
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    Hi Mate,
    I had no trouble when changing my rotors, I used my neighbours impact driver (I hadn't bought one yet) and it was straight forward, were yours already damaged? They could possibly have been overtightened previously, or maybe they are an item to replace with the rotors.
    Cheers Matt
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  3. 22nd June 2011, 09:57 PM #3
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    Use a flat pin punch of around 10mm diameter, punch in the heads with a lump hammer until they come loose, you might even be able to use the screwdriver on them then.
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  4. 23rd June 2011, 07:24 AM #4
    Sully Guest
    They will probably require a good soak with some wd40 or similar. Mine were well and truly stripped by some previous clown before I even started. They required drilling out.
    Replacement screws are cheap and a quick spray with rust prohibitor followed by greasing them up before you screw them in isn't a bad thing.
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  5. 23rd June 2011, 09:30 AM #5
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    Search is your friend...

    Here's a thread on my rotor change. I had the same problem.

    Discovery II brakes

    If you wish to 'cut to the chase'...

    The job in the end was very easy to do. With the bolts that hold the full caliper on it is a 19mm. I used a 12 point socket with a breaker bar and it released easily. The problem area was the screw which holds the rotor to the hub. I took Defenderzook's advice and bought an impact driver. The only problem with it is the screwheads are not big enough. Phillips 2 & 3 are small but I had a very large phillips head in a cheap socket set which fitted a lot better. The main trick from Ron's link was to heat up the screw. This worked perfectly. With a little heat then the impact driver had them undone in a flash.

    Summary....use heat first.
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  6. 23rd June 2011, 05:55 PM #6
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    they aint phillips, thems posidrive.

    p4 wont fit...
    Dave

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  7. 23rd June 2011, 08:43 PM #7
    Ratel10mm
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    Pozi no. 4 are available, I asked one of the local tool shops today after reading your post.
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  8. 23rd June 2011, 08:47 PM #8
    Ean Austral Guest
    Just replace them will hex style when you replace the rotors, never have the problem again.


    Cheers Ean
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  9. 23rd June 2011, 09:41 PM #9
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    As said earlier, a pin punch on the outer edge of the countersunk screw will undo them very quickly.


    Erich
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  10. 24th June 2011, 06:59 AM #10
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    The screw is only there to stop the disc falling off when removing the wheel, once the wheels on, its not doing anything anyway.

    I have had to drill out 2 of the 4, when I fit new ones they go in covered in copper slip and I also "fill" over the head as well which stops the head filling up with crap.
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