Front brake repairs

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John Openshaw - 18 Apr 2005 23:53 GMT

Hi, I'm changing the front disc/rotor on an 89 911 - I can't quite see
how the disc comes off, the Haynes manual says it probably needs pulling
- there are 5 little bolts in the centre of the disc - do these need to
be taken out?

Or any other clues?

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ORVAL FAIRBAIRN - 19 Apr 2005 03:44 GMT

> Hi, I'm changing the front disc/rotor on an 89 911 - I can't quite see
> how the disc comes off, the Haynes manual says it probably needs pulling
> - there are 5 little bolts in the centre of the disc - do these need to
> be taken out?
>
> Or any other clues?

The caliper has to be removed, then the wheel from the spindle. Then
remove the 5 bolts and gently tap the brake disk away from the wheel.

The disk may very well be partially corroded in place (steel/aluminum
mating). Use a brass hammer on the disk to shake it loose.

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John Openshaw - 20 Apr 2005 00:56 GMT

In article <o_r_fairbairn-F3EA19.22442218042005@news1.east.earthlink.net

>, ORVAL FAIRBAIRN <o_r_fairbairn@earthlink.net> writes
>
[quoted text clipped - 8 lines]
>The disk may very well be partially corroded in place (steel/aluminum
>mating). Use a brass hammer on the disk to shake it loose.

Thanks - exactly the information I needed which was missing from the
Haynes manual!

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John Openshaw

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ORVAL FAIRBAIRN - 21 Apr 2005 04:52 GMT

> In article <o_r_fairbairn-F3EA19.22442218042005@news1.east.earthlink.net
> >, ORVAL FAIRBAIRN <o_r_fairbairn@earthlink.net> writes
[quoted text clipped - 12 lines]
> Thanks - exactly the information I needed which was missing from the
> Haynes manual!

BTW, I decided to take my calipers apart ('67 911S) and am glad I did.
The pistons were very difficult to move and had a lot of crud inside.

The secret to putting it all back together is to use a Moto Tool
stainless steel rotary brush in the O-ring groove and to use lots of
disk brake lube (I am using Permatex Disk Brake Lube) on the O-rings,
piston, cylinder and internals. Replace the piston carefully, until you
feel it start past the O-ring, otherwise you can destroy the O-ring.

Also, use the disk brake lube on the line fittings, to prevent corrosion.

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