Vented discs for P6

P

p6jpe

New Member
:) With time to kill over Xmas discovered that company calledparts for older cars (www.carparts-direct.co.uk) can supply upgraded brake discs for P6. They are made by Rossini and are vented and grooved. They can supply for front and rear and are a direct replacement.

They are expensive (£189 for front pair and £169 for rear) compared to standard (£74/£60) but they will offer a discount if enough interest from the club.

Any takers?

P6jpe
 
Do the new discs fit with the existing calipers? A standard disc in Aust is quoted as $290 EACH! So I will be interested in vented discs for the equivilent of that per pair.
Good as they are the V8's brakes can still be improved. :)
Cheers
GUY
 
I have called them about these disks a little while ago for my 2000, and they said they should be a direct replacement. I think the same goes for the V8, which Im now playing with.

They are also (I seem to remember) grooved and cross-drilled for cooling. Grooves are no problem, but a motorsport contact tells me that drilling can weaken the disk and make it crack under extreme conditions.

That said, if they were a bit cheaper Id go for a set!

Matt
 
I had a pair of brembo cross drilled discs on an mg midget that started to break up after a lot of heavy use.

My opinion is that they wouldn't serve much purpose unless under very heavy use such as on a race track where brake fade might become an issue. If this were a problem you'd maybe look to the pad material rather than the disc in the first instance anyway.

That said if they were cheaper (than standard) i'd go for a set to! They do look nice after all.
 
;) Thanks for all the responses.

I don't know how thick they are but they look about the same and are meant to be a direct replacement. I was surprised that they could supply for a P6 so do not know if there would be any problems fitting.

I've heard of people fitting different discs such as from an M3 (with mod to caliper fitting) and reporting positive results; grooves and vents should improve cooling and thereby reduce brake fade. I would expect them to be warranted and if properly made should be up to the job. They also have wear indicators (logo on th disc) which shows rate and evenness of wear.

I have tried EBC pads (green stuff) which were better than standard and use kevlar material but only lasted 12 months in daily use.

I think the other part of the problem is the level of servo assistance - hence the progressive feel. Is it improved with the dual braking system?

jpe
 
A set of Rossini's and green stuff pads are going onto the rebuild at the moment. Truly beautiful bits of work. Not too many X drills and very intelligently chamfered, so wouldn't expect a problem with cracking there.

My logic for fitting goes back to the last few ordinary cars I've had - mainly fast Golfs. I use the combination of grooved discs and green stuff pads as my default choice. The improvement in high speed braking is dramatic with no penalties in feel or response at low speed. I've not noticed any obvious deterioration in pad life.

If you have too many grooves you can get a bit of a hum under braking but the Rossini's are sensible. Theory is that the pad actually boils against the surface of the disc and the grooves allow the gases to escape - hence no fade performance from what would otherwise have been a soft pad.

Note that this means that green stuff against a standard disc is probably not a good idea.

We'll see how they get on on the Rover
 
P6's have pretty decent brakes as standard, especially compared to some modern cars that seem to rely on ABS instead of proper brakes.
If the discs are to fit with standard calipers then they must be standard thicknes, hence they are cross drilled and grooved, technically not vented. Vented discs are the type with hollow chambers inside which allow air to flow through from the outer edge of the discs to the inner-hub edge and improve cooling. The inclusion of the vents means the discs have to be thicker, usually about twice the thickness of non vented discs.

The grooves and cross drillings do improve matters, and on a P6 should remove any 'marginal' braking. Also worth changing the flexible hoses, especially if you don't know their age, I recommend stainless braided hoses, fitted some to mine when the old rears where holding pressure, and they made quite a difference, plus they don't really cost any more than standard ones, especially if you make them up yourself.

And of course, make sure your fluid is nice and fresh !

A friend of mine has a tuned celica gt4 which came as standard with naff brakes, he went through all the options, green stuff, grooved, drilled etc, in the end he replaced the whole lot with massive vented, grooved discs on seperate bells and big 4 pot calipers that need 17" alloys to clear !, but now he doesn't get any fade... Cost about £500 for the setup.

brakes.jpg


Richard



Edited By webmaster on Feb. 06 2005 at 00:39
 
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