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Common problems:
Window mechanisms - they bend and break. Keep the window rubbers well lubricated with rubber lubricant to stop it happening.

Aerials don't extend/retract fully - Clean the aerial mast with solvent - NO LUBRICANT to be used on them. Masts are cheaply replacable - Rover/Xparts or E-bay.

 

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All petrol engines will produce a vacuum on idle.
Diesel engines won't though.

 

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nylon and rubber lubricant is what I use. Holts do it in a little spray can which is good. Or there are other sources though, I think maplin also do one. Failing that WD40 or GT85? would be better than nothing.

 

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A faulty rubber hose or dented steel brake line can also cause the same symtoms.

 

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Better off starting another post with this question, but it is likely to be faulty door switches.

 

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Remember clear glass only lets about 80-90% of light through to start with though, meaning any tint on the front is EXTREMELY limited.