Discussion
Hello all,
I have bought some larger front discs for my 98' 4.2 Cerb. The discs are 30mm larger than standard so now I need spacers and 15mm longer bolts. I have the spacers but the bolts are hard to track down. They are 10mm metric 1.25 fine thread, high tensile with sk head.
Does anyone know where I might find four of the above? Any help appreciated.
Cheers Ed.
I have bought some larger front discs for my 98' 4.2 Cerb. The discs are 30mm larger than standard so now I need spacers and 15mm longer bolts. I have the spacers but the bolts are hard to track down. They are 10mm metric 1.25 fine thread, high tensile with sk head.
Does anyone know where I might find four of the above? Any help appreciated.
Cheers Ed.
More often than not you DO have to change the callipers on the 4.2 I think, certainly I am having to on my 4.2 (in with Andy @ ApM right now for the same thing). Having said that there were some different types of calliper fitted so some are ok - to determine it depends I think on the number of bolts you have I think (this followed a conversation I had with Bellhill who said I might be ok, but I wasn't 
); 3 bolts along each side and you are ok, and 2 bolts you are not (this is from memory as my car isn't here, so may have that the wrong way round). I think the 2 bolts are the earlier 5100 calliper not 5200, and max size of that is 295mm.
); 3 bolts along each side and you are ok, and 2 bolts you are not (this is from memory as my car isn't here, so may have that the wrong way round). I think the 2 bolts are the earlier 5100 calliper not 5200, and max size of that is 295mm. Edited by touching cloth on Wednesday 27th February 20:11
Hmmn, slightly strange that. The pic of the 5200 on the AP website definitely shows it having 3 bolts each side
http://www.apracing.com/calipers/products.asp?prod...
yet the diagram above does only show 2
However if you look at the table, there is a version of the 5200 that maxes out at 304mm, where all the others are 330. I wonder if the diagram is for the version of the 5200 that is 304 max (2 bolts)and this is what went on the 4.2's and the others are the 3 bolts and have the larger capacity and were used on the 4.5. I think now I was wrong about the 5100 being the 4.2 caliper as doesn't look right either having now found a pic of mine.
Annoyingly I did find loads of threads on this a while back when I first started digging about this, but the new search function only goes back 2 years now so most aren't coming up - I remember Joolz on one of them giving a good account of what could and could not be done. The only thread I can find is this more recent one:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
If you see Longbows reply to me at the bottom of the page you will see his comments on upgrading, he concurs with the info Bellhill gave me about number of bolts 6 bolts for 4.5 spec and 4 bolts for 4.2 spec. Sadly I think if you have 2 on each side (4 total) you have the same calliper as me and it's not specced to take a 320 disc.
http://www.apracing.com/calipers/products.asp?prod...
yet the diagram above does only show 2
However if you look at the table, there is a version of the 5200 that maxes out at 304mm, where all the others are 330. I wonder if the diagram is for the version of the 5200 that is 304 max (2 bolts)and this is what went on the 4.2's and the others are the 3 bolts and have the larger capacity and were used on the 4.5. I think now I was wrong about the 5100 being the 4.2 caliper as doesn't look right either having now found a pic of mine.
Annoyingly I did find loads of threads on this a while back when I first started digging about this, but the new search function only goes back 2 years now so most aren't coming up - I remember Joolz on one of them giving a good account of what could and could not be done. The only thread I can find is this more recent one:
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
If you see Longbows reply to me at the bottom of the page you will see his comments on upgrading, he concurs with the info Bellhill gave me about number of bolts 6 bolts for 4.5 spec and 4 bolts for 4.2 spec. Sadly I think if you have 2 on each side (4 total) you have the same calliper as me and it's not specced to take a 320 disc.
Oh bugger, just had the discs milled to make sure all was nice and straight as well. Roughly how much would you look to pay for a second hand pair of the 4.5 calipers do you reckon?
Ideally need to find someone with a 4.5 that's done a brake upgrade I guess, or someone with a 4.5 who wants some nice 320mm discs
Ideally need to find someone with a 4.5 that's done a brake upgrade I guess, or someone with a 4.5 who wants some nice 320mm discs
While you have your new calipers off the car, it's worth renewing the seals. BG Dev quoted me £10.50 a caliper for a seal kit. You can pop the pistons out with an air line, but you may need to clamp some in place to work round all of them.
Steve.
Steve.
Edited by Steve_T on Thursday 28th February 09:45
Ed FM said:
Oh bugger, just had the discs milled to make sure all was nice and straight as well. Roughly how much would you look to pay for a second hand pair of the 4.5 calipers do you reckon?
Ideally need to find someone with a 4.5 that's done a brake upgrade I guess, or someone with a 4.5 who wants some nice 320mm discs
Possibly have a pair! YHMIdeally need to find someone with a 4.5 that's done a brake upgrade I guess, or someone with a 4.5 who wants some nice 320mm discs
The hubs are different, but only in that the 4.5 ones space the callipers out further to accomodate the larger discs found as standard on the 4.5. You can retro fit 4.5 callipers quite happily to the 4.2 hubs - I know this as this is how my car came, don't know why, but it did.
If you're upgrading from a 4.2 setup to a 4.5 you can either;
1. Buy 4.5 hubs, callipers and discs. Job done.
2. Buy 4.5 callipers and discs and use custom spacers or washers to space out the 4.5 callipers using the standard 4.2 hubs.
Don't forget the standard 4.5 has 322mm discs, but can take up to 330mm. The 4.2 as standard has 291mm discs and can only go up to around 306mmish from memory - certainly not 330mm as per the 4.5 callipers. Hence, if you've got a 4.2 and want to go bigger, just go the whole hog and go for 330mm.
If you're upgrading from a 4.2 setup to a 4.5 you can either;
1. Buy 4.5 hubs, callipers and discs. Job done.
2. Buy 4.5 callipers and discs and use custom spacers or washers to space out the 4.5 callipers using the standard 4.2 hubs.
Don't forget the standard 4.5 has 322mm discs, but can take up to 330mm. The 4.2 as standard has 291mm discs and can only go up to around 306mmish from memory - certainly not 330mm as per the 4.5 callipers. Hence, if you've got a 4.2 and want to go bigger, just go the whole hog and go for 330mm.
Ok think i'm getting there now. I already have 320mm discs ready to go on. I have found some 4.5 calipers. I have the proper spacers needed to allow for the bigger disc. I will still need the longer bolts that started this post though. Hopefully Trident Racing will be able to sort those out for me...
Gassing Station | Cerbera | Top of Page | What's New | My Stuff