My Zafira diesel has done 61k miles. The front disks are well scored and 
have a lip of around 2 mm.
When should I change them? Brakes work well at the moment, though a bit 
squeaky. Pads changed 6k miles ago.

Alec

"Alec"  wrote in message 
news:42dfb2e0$0$13712$cc9e4d1f@news-text.dial.pipex.com...

> My Zafira diesel has done 61k miles. The front disks are well scored and 
> have a lip of around 2 mm.
> When should I change them? Brakes work well at the moment, though a bit 
> squeaky. Pads changed 6k miles ago.
>
> Alec


change them when they are worn beyond recommended limits or are damaged or 
distorted.  yours are heavily worn and should be changed.

mrcheerful

and

>> have a lip of around 2 mm.
>> When should I change them? Brakes work well at the moment, though a bit 
>> squeaky. Pads changed 6k miles ago.
>>
>> Alec
>
> change them when they are worn beyond recommended limits or are damaged or 
> distorted.  yours are heavily worn and should be changed.


Is there somesort of data source for minimum thicknesses?


Tom Burton

Tom Burton wrote:

> and
> 
>>>have a lip of around 2 mm.
>>>When should I change them? Brakes work well at the moment, though a bit 
>>>squeaky. Pads changed 6k miles ago.
>>>
>>>Alec
>>
>>change them when they are worn beyond recommended limits or are damaged or 
>>distorted.  yours are heavily worn and should be changed.
> 
> 
> Is there somesort of data source for minimum thicknesses?
> 
> 
> Tom Burton 
> 
> 

Its often stamped on new disks [:-)] and it's in the Haynes manual:

Zafira front disks:
Minimum thickness - hub carrier with integrated caliper bracket - 21mm
Minimum thickness - hub carrier without integrated caliper bracket - 22mm

Minimum thickness in this case means once you have reached this 
thickness, only one more set of new pads should be fitted.

The lip can easily be removed with an angle grinder. Glazing, which may 
be the cause of squeaking, can be busted with emery cloth [and probably 
umpteen other ways....], but bad scoring needs skimming, at which stage 
compare the cost of skimming with price of new disks (generally not 
worth it IMHO).

Biggles
Remove packaging. before e-mailing.

>>
>>
> Its often stamped on new disks [:-)] and it's in the Haynes manual:
>
> Zafira front disks:



Any chance somebody could look up a min thickness for a 1998  Corsa 1.7D


Many Thanks

Tom

"Tom Burton"  wrote in message 
news:E9vEe.627$m4.387@newsfe1-win.ntli.net...

>>>
>>>
>> Its often stamped on new disks [:-)] and it's in the Haynes manual:
>>
>> Zafira front disks:
>
>
> Any chance somebody could look up a min thickness for a 1998  Corsa 1.7D
>
>
> Many Thanks
>
> Tom
>


solid disk minimum 9.7 mm

ventilated 21 mm

hth
mrcheerful

>> Any chance somebody could look up a min thickness for a 1998  Corsa 1.7D
>>
>>
>> Many Thanks
>>
>> Tom
>>
>
> solid disk minimum 9.7 mm
>
> ventilated 21 mm


Cheers... I'll be out with the verniers tomorrow then :-)

Thanks again

"Tom Burton"  wrote in message 
news:qrzEe.13830$vv6.7069@newsfe6-gui.ntli.net...

>
>>> Any chance somebody could look up a min thickness for a 1998  Corsa 1.7D
>>>
>>>
>>> Many Thanks
>>>
>>> Tom
>>>
>>
>> solid disk minimum 9.7 mm
>>
>> ventilated 21 mm
>
> Cheers... I'll be out with the verniers tomorrow then :-)
>
> Thanks again
>


You will need spacers then, to miss the raised edge lip.

Digital verniers at aldi and lidl next week at sub 10 pounds, a really 
useful bargain.

mrcheerful

Tom Burton wrote:

> >
> > solid disk minimum 9.7 mm
> >
> > ventilated 21 mm
>
> Cheers... I'll be out with the verniers tomorrow then :-)


A micrometer would probably be a lot better!

On Sun, 24 Jul 2005 10:39:40 +0100,  wrote:


>
> Tom Burton wrote:
>> >
>> > solid disk minimum 9.7 mm
>> >
>> > ventilated 21 mm
>>
>> Cheers... I'll be out with the verniers tomorrow then :-)
>
> A micrometer would probably be a lot better!
>


Vernier's fine for 1/10th mm measurings, it's not like either will have  
been calibrated.

>
> Minimum thickness in this case means once you have reached this
> thickness, only one more set of new pads should be fitted.
>

No, minimum thickness means just that, in other words when the disc has
reached minimum thickness, you change it. Don't expect it to last through
another set of pads.

"Duncanwood"  wrote in message 
news:op.sue3weop4wom51@amy...

> On Sun, 24 Jul 2005 10:39:40 +0100,  wrote:
>
>>
>> Tom Burton wrote:
>>> >
>>> > solid disk minimum 9.7 mm
>>> >
>>> > ventilated 21 mm
>>>
>>> Cheers... I'll be out with the verniers tomorrow then :-)
>>
>> A micrometer would probably be a lot better!
>>


If i had one..... But at the end of the day its not like i need to be spot 
on.


>
> Vernier's fine for 1/10th mm measurings, it's not like either will have 
> been calibrated.


Certainly not!

I chopped up some 5mm flat bar took the burrs off an used them as spacers, 
THEN read Mr. Cheerful's post  *feels pleased with himself*

Well not that any of you car but they are 10.5mm ish with only a bit of pad 
to go, so me thinks ill be changing them with the pads...

Its not worth getting covered in black crap twice for.....

Now all I need is better impact driver.... Does anyone have any views on 
silverline stuff? some of it looks a bit naff to me.


Tom

"Tom Burton"  wrote in message 
news:BimFe.6819$m4.3407@newsfe1-win.ntli.net...

>
> "Duncanwood"  wrote in message 
> news:op.sue3weop4wom51@amy...
>> On Sun, 24 Jul 2005 10:39:40 +0100,  wrote:
>>
>>>
>>> Tom Burton wrote:
>>>> >
>>>> > solid disk minimum 9.7 mm
>>>> >
>>>> > ventilated 21 mm
>>>>
>>>> Cheers... I'll be out with the verniers tomorrow then :-)
>>>
>>> A micrometer would probably be a lot better!
>>>
>
> If i had one..... But at the end of the day its not like i need to be spot 
> on.
>
>>
>> Vernier's fine for 1/10th mm measurings, it's not like either will have 
>> been calibrated.
>
> Certainly not!
>
> I chopped up some 5mm flat bar took the burrs off an used them as spacers, 
> THEN read Mr. Cheerful's post  *feels pleased with himself*
>
> Well not that any of you car but they are 10.5mm ish with only a bit of 
> pad to go, so me thinks ill be changing them with the pads...
>
> Its not worth getting covered in black crap twice for.....
>
> Now all I need is better impact driver.... Does anyone have any views on 
> silverline stuff? some of it looks a bit naff to me.
>
>
> Tom
>


Someone suggested a micrometer, probably because it doesn't need the 
spacers.

The only really good impact driver is the one that snap on sell which is 
used with an air hammer, these are incredibly good, they never fail.

The type you hold and hit are all much of a muchness, they are about as good 
as knowing how to use a good screwdriver properly.  If the screw is 
seriously tight always give it a good whack with a drift first, this jars 
the head loose and closes the screw recess a little, a good screwdriver will 
then undo just fine, extra leverage is usually available with a l spanner on 
the shaft of the screwdriver.  So in conclusion, buy good screwdrivers first 
and an impact driver second.  My snap on screwdrivers are still good after 
20 plus years, one shaft was replaced after I snapped it using it as a 
prybar (free replacement of course) so a really good investment overall.

mrcheerful

On Tue, 26 Jul 2005 10:00:13 GMT, "mrcheerful
.."  wrote:


>
>"Tom Burton"  wrote in message 
>news:BimFe.6819$m4.3407@newsfe1-win.ntli.net...

>> Now all I need is better impact driver.... Does anyone have any views on 
>> silverline stuff? some of it looks a bit naff to me.
>>
>>

>
>The only really good impact driver is the one that snap on sell which is 
>used with an air hammer, these are incredibly good, they never fail.
>

If you're using air tools there's less need for an impact driver anyway
as the air impact wrench will do the job in most cases.
-- 
Regards,  Chris    (Please take out my car to reply by email)     
----1961 Austin A40 Farina----1966 Triumph Herald Estate---
---1967 Riley Elf---1965 Hillman Minx---1969 Morris Minor--
-1972 Mini Clubman estate--1957 Standard 8--1979 Ford Capri
    ********** Please don't email in HTML! **********

"Chris Bolus"  wrote in message 
news:tb3ce1tjoeaab8tkcejr9l3qg4ru8hhi1m@4ax.com...

> On Tue, 26 Jul 2005 10:00:13 GMT, "mrcheerful
> ."  wrote:
>
>>
>>"Tom Burton"  wrote in message
>>news:BimFe.6819$m4.3407@newsfe1-win.ntli.net...
>
>>> Now all I need is better impact driver.... Does anyone have any views on
>>> silverline stuff? some of it looks a bit naff to me.
>>>
>>>
>
>>
>>The only really good impact driver is the one that snap on sell which is
>>used with an air hammer, these are incredibly good, they never fail.
>>
> If you're using air tools there's less need for an impact driver anyway
> as the air impact wrench will do the job in most cases.
> -- 


Air impact with a screwdriver bit can/does destroy the heads, the air hammer 
attachment doesn't, principally because the turning force is hand applied.

mrcheerful