1986 turbo front discs
- Thread starter James0
- Start date
924Srr27l
New member
Don't forget Pads, Heat Treatments, driving style and talent play a big part in why brakes work well or not...
The OE compounds and aftermarket makes like Textar, Delphi, Pagid, Brembo, Mintex, TRW, Febi, Sebro, Ate, Apec, etc will all have a low to mid temperature ranges
and hence will not stand up to heavy punishment on the road or trackdays, if they overheat , the Discs may bend & wharp.
Some of Brands above will also list pads with higher heat ranges, but then if the Brake discs are not heat treated they are even more likely to bend when subjected to pads that
can be taken to a higher temp but the discs can't handle this! (More wharping)
One Example here is TAROX, who list some track day /race orientated pads @ £194 (You can easily get discs and pads for this, but they will be cheap for a reason, so unless your driving your Porsche like Miss Daisy! there's a chance they will bend)
https://www.ebay.co.uk/it...811:g:gWwAAOSwBChbYDON
Their Discs unlike most have been heat treated for strength and hand finished to ensure the smoothest possible braking surface.
Tarox Sport Japan Brake Discs
https://www.ebay.co.uk/it...99a:g:5kYAAOSwW3dbaIJu
These and other higher end & race products the pads are designed to use cohesive friction to produce brake force. The brake pads transfer a thin layer of pad material on to the rotor surface known as the transfer layer. The braking force is achieved by continuously breaking the adhesive bonds between the brake pad and the transfer layer on the brake disc.
A problem can occur if this transfer layer is not laid evenly and consistently on the disc faces.
Inconsistencies in this transfer layer will cause uneven friction levels during braking. Over a reasonably short period of time these inconsistencies can progressively become more pronounced resulting in pedal pulsation, brake shudder and the steering wheel shaking. This problem usually occurs as a result of the brake pads not being initially bedded in correctly so as to lay a consistent transfer layer evenly onto the face of the rotor. Slotted and/or drilled rotors can be more susceptible to this problem due to the pad cleaning effect of the slots and/or drilled holes.
Do not choose a high performance pad if you do not drive the car aggressively otherwise the discs are likely to wharp especially when new and bedding in as
insufficient heat generated in the braking system the pads are prone to glazing if run too cold. If they glaze they will lack bite and feel and then overheat much quicker (Because you press the pedal harder) transferring the excessive heat into the discs which also may then overheat and bend.
R
The OE compounds and aftermarket makes like Textar, Delphi, Pagid, Brembo, Mintex, TRW, Febi, Sebro, Ate, Apec, etc will all have a low to mid temperature ranges
and hence will not stand up to heavy punishment on the road or trackdays, if they overheat , the Discs may bend & wharp.
Some of Brands above will also list pads with higher heat ranges, but then if the Brake discs are not heat treated they are even more likely to bend when subjected to pads that
can be taken to a higher temp but the discs can't handle this! (More wharping)
One Example here is TAROX, who list some track day /race orientated pads @ £194 (You can easily get discs and pads for this, but they will be cheap for a reason, so unless your driving your Porsche like Miss Daisy! there's a chance they will bend)
https://www.ebay.co.uk/it...811:g:gWwAAOSwBChbYDON
Their Discs unlike most have been heat treated for strength and hand finished to ensure the smoothest possible braking surface.
Tarox Sport Japan Brake Discs
https://www.ebay.co.uk/it...99a:g:5kYAAOSwW3dbaIJu
These and other higher end & race products the pads are designed to use cohesive friction to produce brake force. The brake pads transfer a thin layer of pad material on to the rotor surface known as the transfer layer. The braking force is achieved by continuously breaking the adhesive bonds between the brake pad and the transfer layer on the brake disc.
A problem can occur if this transfer layer is not laid evenly and consistently on the disc faces.
Inconsistencies in this transfer layer will cause uneven friction levels during braking. Over a reasonably short period of time these inconsistencies can progressively become more pronounced resulting in pedal pulsation, brake shudder and the steering wheel shaking. This problem usually occurs as a result of the brake pads not being initially bedded in correctly so as to lay a consistent transfer layer evenly onto the face of the rotor. Slotted and/or drilled rotors can be more susceptible to this problem due to the pad cleaning effect of the slots and/or drilled holes.
Do not choose a high performance pad if you do not drive the car aggressively otherwise the discs are likely to wharp especially when new and bedding in as
insufficient heat generated in the braking system the pads are prone to glazing if run too cold. If they glaze they will lack bite and feel and then overheat much quicker (Because you press the pedal harder) transferring the excessive heat into the discs which also may then overheat and bend.
R
blade7
Well-known member
scam75 said:
I checked the receipt, it was CP4LESS and 5 years ago, they were the cheapest seller for those pads I found. Re the shims, I reused what was already in there. I think they're called vibration dampers, with a bit of copper slip. The old pads had loads of life left, but the noise was terrible. I also notice the Pagid dics had a different part no. for left and right. They haven't warped in the last 10k.
scam75
Well-known member
As far as I'm aware M030 fronts, and medium blacks, are the same? Defo same as the 928 ones for discs and pads. 304mm disc and pads. Non M030 turbo has same pads back and front. Maybe somebody can clarify. My calipers are actually slightly modified from a 993 but the ones I took off were the original M030 ones which I thought were same as medium blacks!
Stuart
Stuart
scam75
Well-known member
My calipers are radial mounted, but the discs and pads are same as for any turbo s or turbo with M030. I have M030 in my options list which I always assumed meant the Koni suspension and larger front calipers and possibly roll bars......
Confused now. Do all turbo s and 250bhp turbos and M030 cars not have the 304mm discs and larger front pads and calipers?
Confused now. Do all turbo s and 250bhp turbos and M030 cars not have the 304mm discs and larger front pads and calipers?
blade7
Well-known member
Mine aren't radial mount, they're medium black 928 S4 calipers as fitted to standard 250 bhp cars. Also the front discs are 304mm. Probably going to get them stripped down and refurbed at some point, though I've read there's a big brake conversion using newer model Porsche parts and adaptors that doesn't cost a fortune.
I also thought all 250bhp cars calipers (medium big blacks) had calipers that mounted the same with the fixings 90 degrees from the smaller calipered cars, the big blacks (reds) mount the same way as the mediums so bolt on (with bigger discs). I also thought all 250 front discs should have directional vents in the disc, so the discs are handed.
Tony
Tony
Waylander
Active member
M030 was a 4K option, not many went for it,
you see sets of hubs, spindles and calipers for upwards of 2K second hand,
they are all different to the normal 97mm Brembos as used on the turbo and 968,
i had to look in PET for someone with a bent M030 spindle for a 968, they are nearly £1800 each new.
If you wanted to do this with all new bits and they are available, it would cost close to 10 grand
you see sets of hubs, spindles and calipers for upwards of 2K second hand,
they are all different to the normal 97mm Brembos as used on the turbo and 968,
i had to look in PET for someone with a bent M030 spindle for a 968, they are nearly £1800 each new.
If you wanted to do this with all new bits and they are available, it would cost close to 10 grand
blade7
Well-known member
How much are the standard 250 bhp calipers and discs from Porsche though? I wonder how much difference the MO30 stuff makes on the road. I came close to buying a red Turbo S that had 993 TT brakes on the front, I think the drilled discs were quite expensive.Waylander said:
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