Trying to find somewhere that will sell M10 x 50mm Socket head bolts, 8.8 grade, to allow me to space out the front 4 pot calipers.
Can’t find anywhere online other than in the US. What have the rest of you with 315mm disks done?
The original bolts for the 308 disks were 45mm, and don’t fancy reusing once they are spaced out.
10.9’s here -
http://deroure.com/partinfo.asp?MAK=1&MDL=21&TBL=1982&SMA=0&SMO=0&ST=&SC=0&PBID=52276
pretty sure the 2x std allen caps for the calliper mounting are 12.9 rated, which any good bolt stockist should be able to get in a 12.9.
Which calipers do you have Will?
If they are the direct fit Lotus/AP ones, then the standard bolts are totally fine. The bolts Lotus use on the calipers are 8.8.
You cannot get enough torque into the 10.9 or 12.9 bolts when its holding an alloy caliper!!!
Will ring you and see if I can help
Dave
Lotus definitely supply 8.8 not anything higher.
My calipers are the early ones with adapted plates rather than direct mount hence needing the shorter bolts as they just go to the adapter not all the way to the upright.
Bad idea to shorten some I already have with a hack saw or grinder?
There is nothing wrong with shortening a bolt…structurally, the last thread sees no load at all. You don’t want to get it blue with a grinder, but anything short of that is OK.
The sowed off end will rust, but again…there is no load on the last thread…
Will I will have a look thru my bolt box, I may have some serviceable used lotus caliper bolts that will do the job.
If I do will pop them into the box of other parts…
Thanks Dave, appreciate it.
Will
Put some 65mm ones in the box, they will need to be cut down, hope it helps…
Dave
Thanks Dave, all the parts arrived during the week. Thanks for sending the extra bolts.
I’ve had an interesting couple of weekends, certainly got some practice in changing disks and pads.
Last weekend had to do the Clio. What an absolute pig of a job. Brake pad pins wouldn’t knock out as had corroded into the calipers.
Bigger hammer seemed like the answer and worked on the passenger side, but on the drivers side the pins just bent and ended up having to cut them out with an angle grinder.
Con would have liked the calipers.
Lotus front and rear this weekend. Rear was no issue at all. I’ve just put standard size EBC USR disks back on, with PF pads. This is what I had before. Plan had been to go with the 308 discs on the rear, and I’ve got most of the parts in the garage, but still waiting on the HiSpec spot calipers 10 weeks after ordering them. Been promised them “next week” several times since Feb. Guess they’ll eventually turn up, but needed to do something for Anglesey.
Fronts went on fairly straightforward once I’d shortened the bolts. Had to drill out the disk retaining bolt on the passenger side, so a little bit of cursing, but other than that okay.
These are the brackets on the early 4pots.
Dave’s Alcons 315mm disks installed.
After all that, finally got out to give the car a bit of a shake down. Panic, as it ran like a dog for the first few miles, but once up to temp all good. Glad to be out of hibernation.
Thanks again Dave, I’ll be making a donation to Ben’s fund.
They look nice!
Cheers. Unfortunately, everything else in the picture lets it down compared to your build. But it’s the way it goes that matters most this week.
Hopefully, it runs lovely through for the next 6 days, then I can get a chance to give it more TLC.
Looking forward to catching up Will.
Yeah looking forwards to seeing you and the car Will, it’s been ages. Still got the Clio eh,…I thought you were gonna get an R32 Datsun??
Well done on the charity thing bud 
Not the correct disc for the caliper. The friction face is too large (59mm), and therefore too heavy (5.3kg), for the caliper. The other problem with not having the correct disc, is that the friction surface is not heated up uniformly… the correct 315mm disc has a 203.2mm PCD for the 12 mounting bolts. Your PCD is 177.8mm…
This is the correct disc has a friction surface of 46mm and only weighs 3.8kg…
You are NOT correct, those discs are not 177.8mm,
190.5mm, have a set on my desk here. Part number isn’t on the AP site
No great surprise the part number isn’t on the AP site. As they’re made by Alcon. 