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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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26-02-20, 01:57 PM
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Peter,
In the absence of any suggestions from closer to home it might be worth your while contacting Alex Mitchell at Spencer Lane-Jones, alex@spencer-lj.com , who do a big brake vented conversion. I don't know whether this involves the modification of any existing bits. My 410 is pending this conversion. It will out stop many a modern car but the heat can build up to the point that the fluid boils...... somewhat disconcertingly! Roger Morrall 
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27-02-20, 01:39 AM
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27-02-20, 01:19 PM
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Peter
S L-J have moved on from the modified Renault approach to an AP conversion. There's a picture on the design and development page on their website, alongside what might be modified Renault. You might be able to sweet talk them into telling you more, I find them very helpful. Kevin H Depends on what you mean by normal road use. I have experienced fade on the normal pads on the long drop down from the Prescelly Hills here in Pembrokeshire to our house. This mark you on what is essentially a single track road so no speeding. So I put in "road and track" pads for an Alpine tour and exercised great care. No pad fade but at the end of one long day, after two consecutive passes, the heat struck once we were well into the town. The instructions to the hotel said "straight across the roundabout" and so we did! Normal roads - yes, with ups and downs. But I did manage to get the 410 up the Stelvio. An achievement, but my advice is don't try it. There is no way back, no way to see what is coming at you, lunatic cyclists and motorcyclists were a nightmare and at the top there's only dirty snow and a load of tatty souvenir stalls. I declined to take the same route out.
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27-02-20, 01:28 PM
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Kevin I spoke to the local brake specialist who confirmed what you said, it should be stamped on the disc. He made the point that being thinner than the minimum does not create a danger. Years ago a friend restored an Austin Healy 3000 with brand new discs but according to the garage who were doing the roadworthy certificate 1/2 inch discs were not satisfactory. Clearly there is confusion about the regulations.
Seems to me if I have my discs machined and they are not marked how can there be a problem. If I stick with standard disc and use the Cooper Craft calipers I should have adequate stopping power.
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29-02-20, 07:40 AM
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I was thinking the same thing. When I went to get a roadworthy on my 411, the tester commented to me verbally that the discs were a bit on the thin side, but that wasn't a failure point. Personally I believe original braking performance on the 411 is adequate providing the system is in good working order. The main concern if a car has been standing for a long period of time is rust on the skirt of the caliper pistons.
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