HELP!! brake rotor problems

[Hilux]

Hmm, not the answer I was hoping for....[8|][]

I've decided I want a 964 RS, so must not spend any more on my car......[]

Its a good answer but put another way .................... the pads (via the pistons) can stop the disc rotating with less effort hence they are more efficient in dealing with greater weight or momentum however I would have thought that to regain the complete advantage at the pedal the master cylinder size would need to differ accordingly for optimum effect. The same amount of heat has to be created and lost so a larger mass will allow it dissipate over a larger surface area.

For normal power the medium blacks are ok with good pads on track provided you drive properly and allow cooling off ie: dont lead or trail brake (however I managed to cook my admittedly thin Green Stuff pads on OEM discs) and absolutely stunningly brilliant with PF pads (paint your wheels black to match the dust/pitting though)

£200 for PF pads for great improvement, £15 for ATE blue (or similar) fluid or a load of money (and pads) for the big black conversion.

I am surprised the pad dims are very similar so assume they`ve probably got bigger pistons or at least one of them is increased and caliper wise they simply allow for the radius of the larger disc?? hence they look bigger but really arent IYKWIM and utilse the mechanical advantage mentioned above.

 

[edh]

The calipers themselves are much bigger - I bought a set (now fitted to John Sims car) I believe the pistons are the same size

There was a Rennlist thread recently where one of the 928 guys was looking at machining adapters so that you could use medium blacks with the bigger disc (with 17's I guess) & get most of the benefit of big blacks at a reduced price.

 

[Hilux]

The calipers themselves are much bigger - I bought a set (now fitted to John Sims car) I believe the pistons are the same size

There was a Rennlist thread recently where one of the 928 guys was looking at machining adapters so that you could use medium blacks with the bigger disc (with 17's I guess) & get most of the benefit of big blacks at a reduced price.

Much as I suspected.

If the hydraulics are the same then there`s probably no discernible benefit in them without the larger disc. The caliper increase in size is primarily to present the pads onto a larger radius disc for the increased mechanical advantage with added benefit of a small increase in length of the pad due to the caliper size increase.

 

[LTP]

finally get the VIN its *WPOZZZ95ZGN151019*
can anyone help me find out what discs should be on it?

 

[Diver944]

That is definatley the VIN for an 86 Turbo

ECP have either sent you the wrong parts or somehow you have different non-standard brakes already fitted, maybe by a previous owner.

A picture could help

 

[LTP]

checked the size of my discs, they are 298*28*45. also checked the discs for 86 turbo on europerformance they are exactlly same numbers. now im pretty sure that ECP sent the wrong parts, but too late... still, tahnks guys

 

[tref]

May I make an un-informed suggestion?

On the rear of the S2 at least (which I believe are the same calipers as teh 220 turbo) there is a thick washer BETWEEN the caliper and mount. If taken off in a hurry, this could easily be missed, and the washer assumed to live between the bolt head and caliper, accounting for an offset difference.

I can't say as I can remember if the same applies to the turbo or not - a long time since I played with them, so could get confused with an early '44 or the S2. Not sure about brake upgrdaes or 250 Turbos, but this definately applies to the S2.

Regards,

Tref.

 

[LTP]

thanks for all your advice
bought another set of drilled disc from YES they fits well. shouldnt really try to fit the wrong ones luckey i didnt destory the car
anyway the problem is solved and thank you guys again!~