Excuse me, but why would vented rotors be of help in wet weather? I
believe you are thinking of cross-drilled rotors. Vented rotors consist
of two solid disks separated by radial vanes, which in motion direct
cooling air across the back of the braking surfaces (looking at the edge
of the disk you woud see that it is thicker than usual and has
rectangular openings around the circumference). This serves to reduce
brake fade by cooling the rotors more quickly. This extra cooling would
not be of any help in wet weather. Sometimes vented or solid rotors are
cross-drilled (round holes are drilled in a symmetrical pattern at right
angles to the braking surface, giving a "swiss cheese" appearance to the
rotor). This actually removes braking surface, but adds even more cooling
surface, and has the additional effect of giving any water on the disk an
additional outlet. I have heard that it may also give the brake shoes an
"edge" to bite on, leading to shorter stopping distances, but I am not
sure of this.
Tab Julius had this to say:
>
>I'll look servo assists - thanks. I don't expect much from the vented
>rotors except in wet weather, but I get plenty of that here, so I might do
>those. But the servo assists sound intriguing...
>
>Thanks
>
>- Tab
>
>
>At 06:30 PM 4/24/00 -0300, Michael P. Ohleger wrote:
>>Tab,
>>
>>I added a servo assist to my 67. Had great results. All the other stuff
>>is ok
>>albeit extra $$$$ and I don't think it will stop you any faster unless you
add
>>the assist. The servo gave me greater stopping power and was the closest
>>thing
>>to power brakes I could find. Cheers
>>
>>Michael
>>
>>Tab Julius wrote:
>>
>> > For a '78B
>> >
>> > All my other vehicles are '90+, and as much as I love the MG, I must say
>> > that the brakes are quite a change (but of course, similar to what I grew
>> > up with).
>> >
>> > I don't mind trying to spend a little to improve them, though I'm not
going
>> > to redo the whole system, as the car is currently in one piece and still
>> > being used. Both Moss and Victoria sell Ventilated Rotors - anyone tried
>> > them? Opinions from those who know about them?
>> >
>> > Also, VB sells a "brake kit" which includes the aforementioned rotors,
plus
>> > 4-piston calipers, carbon fiber pads, etc. Thoughts on this
>> > setup? Alternatives?
>> >
>> > Finally, would DOT 4 or DOT 5 be best? (never mind - just joking). But
the
>> > above questions are valid.
>> >
>> > TIA,
>> >
>> > - Tab
>
>
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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