Re: Brakes - Single or dual circuit?
We are going a bit off topic, but ...
From https://assets.publishing.service.go...r-vehicles.pdf
Section 09B Service Brake Control / Mechanical Components
26.It must not be possible to manually adjust braking rates between axles see Notes 4and 5
27.Vehicles fitted with adjustable twin master cylinders that have been rendered inoperable by mechanical means to comply with RS 26 must have a label affixed on the master cylinder or the immediate vicinity with legible text as detailed in Note 6
Note 4: Hydraulic valves that only operate automatically and react to vehicle loading or braking forces are permitted (Load Sensing and Gravity valves) Manually adjusted valves (other than to permit pre-setting the automatic function of a valve) are not permitted to be fitted even if they are rendered un-adjustable.
Note 5: Bias bars and other mechanical adjusting devices fitted to twin master cylindersmust be rendered inoperable by mechanical means e.g. lock wiringof components.
Note 6: Adjusting front/rear brake bias may invalidate approval and breach Construction and Use requirements.
However if the vehicle was not subject to IVA in the first place.......
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Re: Brakes - Single or dual circuit?
The document says - must not be manually adjustable
That is usually taken to mean must "require tools" to be adjusted
Anything can be "adjusted" if you can use tools!
There are similar requirements on protecting people from high voltage - you need to have the cover bolted down "so that it needs tools" to take the cover off
The illustration has what looks like a hand nut that can be rotated by hand to adjust the bias
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Re: Brakes - Single or dual circuit?
Originally posted by HairyDave View Post'Car Builder Solutions' States that drilling and pinning is no longer acceptable, it must be welded!
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Re: Brakes - Single or dual circuit?
Originally posted by HairyDave View Post'Car Builder Solutions' States that drilling and pinning is no longer acceptable, it must be welded!
The legislation will be vague when an inappropriate modification is carried out, and the vehicle sold on without notifying the purchaser.
Buyer beware is not a satisfactory defence in the UK where the seller has a legal obligation to describe the condition of the vehicle accurately.
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Re: Brakes - Single or dual circuit?
'Car Builder Solutions' States that drilling and pinning is no longer acceptable, it must be welded!
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Re: Brakes - Single or dual circuit?
Originally posted by andyf View PostThat's definitely open to interpretation. I'll ask a couple of the guys who have got cars with adjustable bias how they got them through IVA.
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Re: Brakes - Single or dual circuit?
Originally posted by chris_cussen View PostAdjustable brake bias. Look at https://www.gov.uk/government/public...-a-pass#brakes
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Re: Brakes - Single or dual circuit?
Adjustable brake bias. Look at https://www.gov.uk/government/public...-a-pass#brakes
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Re: Brakes - Single or dual circuit?
It seems to be that the IVA testers probably are not requiring welding, that's probably offered as an example of how to meet the requirement, using lock nuts would achieve the same result...
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Re: Brakes - Single or dual circuit?
Andy: IVA requires the brake ballance to be non-adjustable, i.e. welded. Your MOT tester may not be aware of the difference and you could probably get away with it.
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Re: Brakes - Single or dual circuit?
Originally posted by chris_cussen View PostRobin is correct. However if you use dual cylinders and find the best ballance then weld the adjustment then it will pass as it won't be adjustable....
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Re: Brakes - Single or dual circuit?
Originally posted by martinclan56 View PostAs this thread seems to have lost it's purpose I though I would post what I have discovered by much Googling!
The (non servo) tandem master cylinder seems to be a very rare beast. I have been unable to even find a picture of it! however what I have discovered is a few facts.
Bore was 0.7" (Servo version 0.75")
The mounting flanges are vertically in line (Servo version horizontally in line)
Because of the angle of the pedal box the fluid reservoir is wedge shaped. The same for (I guess) both non servo, and servo versions.
Anyway, what I have discovered is the GMC226 as used on later Spitfires. 0.7" bore, vertically aligned mounting flange and a wedge shaped reservoir.
[ATTACH=CONFIG]11877[/ATTACH]
It's my best guess that it will do the job. I know that the Marina shared some of the gearbox internals with Triumph. Maybe that applies to the brake hydraulics as well....
Cheers, Robin
The Marina gearbox is essentially a Triumph clone with slightly different gear clusters but all the bearings, dog clutches and slip rings etc are essentially interchangeable. With all the small Triumph range.
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Re: Brakes - Single or dual circuit?
As this thread seems to have lost it's purpose I though I would post what I have discovered by much Googling!
The (non servo) tandem master cylinder seems to be a very rare beast. I have been unable to even find a picture of it! however what I have discovered is a few facts.
Bore was 0.7" (Servo version 0.75")
The mounting flanges are vertically in line (Servo version horizontally in line)
Because of the angle of the pedal box the fluid reservoir is wedge shaped. The same for (I guess) both non servo, and servo versions.
Anyway, what I have discovered is the GMC226 as used on later Spitfires. 0.7" bore, vertically aligned mounting flange and a wedge shaped reservoir.
gmc226.jpg
It's my best guess that it will do the job. I know that the Marina shared some of the gearbox internals with Triumph. Maybe that applies to the brake hydraulics as well....
Cheers, Robin
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Re: Brakes - Single or dual circuit?
Originally posted by stevejgreen View PostDo you have such a thing as IVA in NZ?
for a new build to be properly registered in the U.K., it’s mandatory. Once registered, you can do what you like, provided you don’t mind driving an illegally modified car, and are not caught.
And the Government said "You're On"
So we have a very very sensible set of standards and experienced "Hot Rodders" who run our certification system
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Re: Brakes - Single or dual circuit?
Originally posted by HairyDave View PostMy Roadster is over braked on the front and a suggestion was made to fit a pressure reducer in the font line to balance it. Car Builders IIRC.
The alleged Marina auto-adjusters are notorious for not auto-adjusting.
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