If you use metro ones you should have no problem. You can clain they're of a turbo mini
from the UK. (which they were).
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| 4 piston brake calipers https://www.ausmini.com/forums/viewtopic.php?f=2&t=50406 |
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| Author: | david rosenthal [ Wed Feb 18, 2009 9:23 am ] |
| Post subject: | 4 piston brake calipers |
Has anyone got 4 piston calipers [mini sport or similar] fitted to their road car. Were the calipers inspected by state transport authority and passed. The reason I am enquiring is that with brake mods, the rules here in SA just state that the caliper and disc must be" compatible". According to inspectors the after market caliper must comply with a Aust standard. I am going thru the exersise of using bike 4 spot calipers, however a engineer I know suggested getting a caliper made to comply with standard. |
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| Author: | Harley [ Wed Feb 18, 2009 9:35 am ] |
| Post subject: | |
If you use metro ones you should have no problem. You can clain they're of a turbo mini from the UK. (which they were).
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| Author: | simon k [ Wed Feb 18, 2009 10:10 am ] |
| Post subject: | |
I reckon the cost is going to be prohibitive David - those UK calipers are produced in bulk and still expensive.... but with your own time, and your own machines - a bit of alloy is easy to work on Boostedmini has a set of vented Minispares/sport (can't remember) as does sgc on non-vented I reckon I am going to move the mounting holes on a set of metro (with a spacer as per turbo) calipers to fit under 10"s |
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| Author: | david rosenthal [ Wed Feb 18, 2009 11:34 am ] |
| Post subject: | |
I have just spoken to a engineer who has checked on the ADR requirements and legalities for calipers. He just laughed!!!!!! The construction requirements are basically wide open. Most deal with manufacturers own designs and specs. There is no requirements for material grade for aluminium or construction. The engineering requirements only deal with piston pressure/pad area and the size of the bolts for floating and fixed pistons calipers. The design is up to the manufactuer to ensure that it is not going to break. According to the regulations in SA if the car is pre 1969 the the brake system is not part of ADR requirements. The only thing is a brake test on car inspection. There is no rule that stops you from making your own calipers, as long as they are able to with stand the piston pressure so that they do not break and the braking effiecency is not less than original brakes. As for manufacturing a caliper the tooling and jigs are fairly basic and a piece of 6061 T6[air craft grade] aluminium is quite cheap. I am looking at using centerless ground 504 stainless for the pistons and pads that are app. 75% bigger than std mini pads with 8" vent discs. I am off on another bender!!!! |
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| Author: | awdmoke [ Wed Feb 18, 2009 12:45 pm ] |
| Post subject: | |
I think you are more than capable of making billet calipers, but why make the pistons when you could just choose an "off the shelf" spare part that is readily available? |
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| Author: | david rosenthal [ Wed Feb 18, 2009 1:28 pm ] |
| Post subject: | |
awdmoke wrote: I think you are more than capable of making billet calipers, but why make the pistons when you could just choose an "off the shelf" spare part that is readily available?
Like all the things I make, use the best material for the job. The piston dia is 1 1/2" dia. This gives total piston area[one side] of 3.58 sq". Std cooper s is 2.08sq". Force =pressure X area. The only ones this size are from a bike caliper. A honda or kwaka piston is around $100 each. They are only steel and chrome plated. A piece of centerless ground 504 to make a piston is $5. The OD does not have to be machined, just set-up bar in lathe, drill one end to for the cup and then part off to length. The stainless will not rust, has a hard surface that work hardens with use. The piston rings I am going to use a silicon quad ring [ used in hydraulic systems] that seal a lot better than a square section ring as pressure is increased. Again they are cheap about $4 each. The outer dust seal I am looking at a narrow series lip seal, cost about $7 . I priced up all the bike bits and that was over $500. Typical bike spare part prices!!! With the parts I am looking at the seals can be obtained fron any hydraulic/ brg place. All up cost les than $70 |
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| Author: | simon k [ Wed Feb 18, 2009 1:43 pm ] |
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david rosenthal wrote: awdmoke wrote: I think you are more than capable of making billet calipers, but why make the pistons when you could just choose an "off the shelf" spare part that is readily available? Like all the things I make, use the best material for the job. The piston dia is 1 1/2" dia. This gives total piston area[one side] of 3.58 sq". Std cooper s is 2.08sq". Force =pressure X area. The only ones this size are from a bike caliper. A honda or kwaka piston is around $100 each. They are only steel and chrome plated. A piece of centerless ground 504 to make a piston is $5. The OD does not have to be machined, just set-up bar in lathe, drill one end to for the cup and then part off to length. The stainless will not rust, has a hard surface that work hardens with use. The piston rings I am going to use a silicon quad ring [ used in hydraulic systems] that seal a lot better than a square section ring as pressure is increased. Again they are cheap about $4 each. The outer dust seal I am looking at a narrow series lip seal, cost about $7 . I priced up all the bike bits and that was over $500. Typical bike spare part prices!!! With the parts I am looking at the seals can be obtained fron any hydraulic/ brg place. All up cost les than $70 makes sense to me! same reason I got a mate to make me some pistons for my S calipers a while ago, cost me a cheap bottle of scotch 
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| Author: | BALLISTIC [ Wed Feb 18, 2009 1:59 pm ] |
| Post subject: | |
simon k wrote: I reckon I am going to move the mounting holes on a set of metro (with a spacer as per turbo) calipers to fit under 10"s
You can purchase new ...7.9 calipers (kit) that fit under 10" wheels im sure they use the larger discs (8.4) but will find out more......and let you know. Im aslo sure they make a 4 spot caliper in this size.....but i could be wrong. http://www.minisport.com/acatalog/info_MS2686G.html |
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| Author: | simon k [ Wed Feb 18, 2009 2:15 pm ] |
| Post subject: | |
BALLISTIC wrote: simon k wrote: I reckon I am going to move the mounting holes on a set of metro (with a spacer as per turbo) calipers to fit under 10"s You can purchase new ...7.9 calipers (kit) that fit under 10" wheels im sure they use the larger discs (8.4) but will find out more......and let you know. Im aslo sure they make a 4 spot caliper in this size.....but i could be wrong. http://www.minisport.com/acatalog/info_MS2686G.html yeah, but they're bunickin expensive, and it's a gamble as to whether they'll fit under the intended wheels - I've already got the metro calipers, so testing it out is easy they use a metro rotor machined down to 7.9" |
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| Author: | BALLISTIC [ Wed Feb 18, 2009 2:18 pm ] |
| Post subject: | |
simon k wrote: BALLISTIC wrote: simon k wrote: yeah, but they're bunickin expensive, they use a metro rotor machined down to 7.9" Depends on who you know Simon
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| Author: | david rosenthal [ Wed Feb 18, 2009 2:56 pm ] |
| Post subject: | |
O.K next question where is the cheapest place/price to get new disc brake hubs. Toss-up to go new hubs or drum hubs with adapter plates |
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| Author: | simon k [ Wed Feb 18, 2009 2:57 pm ] |
| Post subject: | |
BALLISTIC wrote: simon k wrote: BALLISTIC wrote: simon k wrote: yeah, but they're bunickin expensive, they use a metro rotor machined down to 7.9" Depends on who you know Simon hmmm - go on Scott, who do I know?? someone good looking, clever and generous? UK exchange rate is pretty good concensus of the UK sourced 4 pots is that the KAD ones are great but pricey, miniSPARES ones are good, miniSPORT ones flex and have poor pedal feel - though it's generally hearsay. Boostedmini and sgc both have MiniSPARES and haven't complained, willy had some miniSPORT and gave them away very soon after fitting them http://www.ausmini.com/forums/viewtopic ... ares+brake |
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| Author: | david rosenthal [ Wed Feb 18, 2009 3:15 pm ] |
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simon k wrote: concensus of the UK sourced 4 pots is that the KAD ones are great but pricey, miniSPARES ones are good, miniSPORT ones flex and have poor pedal feel - though it's generally hearsay. Boostedmini and sgc both have MiniSPARES and haven't complained, willy had some miniSPORT and gave them away very soon after fitting them http://www.ausmini.com/forums/viewtopic ... ares+brake From what I have found out so for on these brakes[ I may be wrong and someone can correct me] The KAD uses HE30 6082 billet alumin. and the minisport are 2014A T6. This is an extruded alloy and is not as strong as either a 6082 or 6061. Also the position of the end bolts is important. The bolt must be below the centerline of the pistons as much as possible. This stops the caliper from spreading |
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| Author: | Mini Mad [ Wed Feb 18, 2009 3:26 pm ] |
| Post subject: | |
david rosenthal wrote: O.K next question where is the cheapest place/price to get new disc brake hubs.
Toss-up to go new hubs or drum hubs with adapter plates Problem with drum adapter plates is the CV size when compared to it's bigger cousin. Especially if you're making the extra power warranting bigger brakes. |
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| Author: | david rosenthal [ Wed Feb 18, 2009 3:34 pm ] |
| Post subject: | |
Mini Mad wrote: david rosenthal wrote: O.K next question where is the cheapest place/price to get new disc brake hubs. Toss-up to go new hubs or drum hubs with adapter plates Problem with drum adapter plates is the CV size when compared to it's bigger cousin. Especially if you're making the extra power warranting bigger brakes. I have fitted CV's off a morris 1100 to the drum hubs. I think that they are same as "S". The taper roller brgs fit into drum hubs and these CV's fitted to std mini drive shafts. This car was running 13" wheels and the bloke found heaps of mags to fit 4 1/2" stud pattern[ same as 115mm jap]. extra benefit 7/16" wheel studs instead of 3/8" |
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