Front brake question

[walchy01]

Really sorry for not knowing parts name I need but here goes....

Took my front offside wheel off to look at my brake hose... The disc u see first that ur 4 bolts go through to hold ur wheel on..... I noticed there was a fifth smaller hole with nothing in it that looks to me should have a flat screw in it to hold the disc still when braking??? If the screw is missing am I still okay driving it???
Sorry for the vague info

Any help would be really greatly appreciated...

[oakgreengolf]

yes its fine. it just keeps the disc square when you remove the wheel

[Thom89]

yes its fine. it just keeps the disc square when you remove the wheel

Ditto

Thom

[clipperjay]

You're lucky they are usually rusted and threaded to bits making a simple disc change a pain 
The wheel bolts make sure it doesn't move about, so like eveyone said no problems 

[walchy01]

Good news for once.....thank you guys that's put my mind at rest

Thanks

[Wayne]

Not needed really but makes fitting the wheel back on easier as it saves the disc moving.