Mk 1 Brake Master Cylinder Switches - Why are there 2?

[Spyda]

Id say it would have come loose from a bad wheel bearing in the first place or someone not tightening it correctly to begin with.

The pressure switches on the master cylinder suck, according to most people they fail often and replacing them requires brake bleeding.

http://www.vwwatercooled.org.au/foru...mk1-55356.html

[Garbon]

Hey thanks for all of the replies

Looks like I'll have to replace the wheel bearing, I could only hand tighten the centre nut so thats probably why it came loose again. I cannot see anything to hold it tight on the drive shaft...

Could it be missing something, I noticed on the rear drums that there was a cotter pin (or something) that was bent to hold the nut on the shaft

I guess I need to ensure it does not come loose again in future, what do I need to look for exactly?

Thanks

[Golfer_76]

dont know about everyone elses but the center nut on my mk1 is slightly out of round which almost acts like a lock nut.
it needs to be done up really tight. you need someone with their foot on the brake and a decent size breaker bar to do it up to whats recommended.

[Preen59]

They utilise squash nuts as a way of locking. If it is done up correctly (like Aydan said, RFT), it should not come loose. The only time they loosen is when the bearing fails, if everything has been done right.

Good move to just replace it, Garbon. Wheel bearings aren't a "I'll get to that next service" type of item.


FYI, the other day I had to use a 2 metre long length of 50x50 RHS on the end of my old man's 3/4 drive breaker bar to get the drive shaft nut undone on a Volvo station wagon while he sat in the car with his foot on the brakes as hard as he possibly could push.. So that'll give you an idea of how tight they can be.

[wai]

They utilise squash nuts as a way of locking. If it is done up correctly (like Aydan said, RFT), it should not come loose. The only time they loosen is when the bearing fails, if everything has been done right.

Good move to just replace it, Garbon. Wheel bearings aren't a "I'll get to that next service" type of item.

This being the case, shouldn't the nut be replaced each time as the ability to deform to lock is lost?

[Peter Jones]

This being the case, shouldn't the nut be replaced each time as the ability to deform to lock is lost?

Yes, They're single use. A wheel bearing kit comes with a new one.

[gldgti]

wheel bearing - 171 498 625 D
axel nut - 171407643A

[Garbon]

Thanks

I bought a bar and a 30mm socket, tightened it all up and it seems to be ok for now. I'll keep checking that it is tight every few days.

Thanks for the part numbers, I'll order them and fit next weekend.

[Peter Jones]

I wrote the wheel bearing procedure up a while ago, you might find it handy.

http://www.vwwatercooled.org.au/foru...ngs-41402.html

[Garbon]

Thanks Pete!