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Post by threelitre on Oct 2, 2013 13:36:25 GMT
1800S cars had more front end braking and should be able to lock the front wheels sooner (Alexander?) The S has quite good brakes for its age, and I do not feel scared to use them. But the last (and only) true emergency I had to use them in was to avoid a cat about 20 years ago. The noises indicated I locked the brakes up near standstill - and certainly not the rear ones before this happened. But the general idea is technically valid - the brake test at the MOT/TÜV/APK/WOF (whatever) only sees the components in a 'stationary' condition. But here in Germany the test is concluded until the wheels either lock up (normally achieved) or the tester runs out of force. So apart from a G-valve (or ABS for that matter), I don't see where this test would fail. In principle the values read from the unit can even tell you if the rear will overbrake or not. Regards, Alexander |
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Post by dave1800 on Oct 3, 2013 3:14:02 GMT
I know your annual tests in Germany are extremely severe compared with most (if not all) other countries. The simple valve fitted to Mk11 cars and I believe your "S" should in theory cause the rear wheels to lock up ie be overbraked if tested to the limit with the car stationary. Do you get a full report from the test centre showing the brake force on each wheel? Regards David 1800S cars had more front end braking and should be able to lock the front wheels sooner (Alexander?) The S has quite good brakes for its age, and I do not feel scared to use them. But the last (and only) true emergency I had to use them in was to avoid a cat about 20 years ago. The noises indicated I locked the brakes up near standstill - and certainly not the rear ones before this happened. But the general idea is technically valid - the brake test at the MOT/TÜV/APK/WOF (whatever) only sees the components in a 'stationary' condition. But here in Germany the test is concluded until the wheels either lock up (normally achieved) or the tester runs out of force. So apart from a G-valve (or ABS for that matter), I don't see where this test would fail. In principle the values read from the unit can even tell you if the rear will overbrake or not. Regards, Alexander |
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Post by threelitre on Oct 3, 2013 20:59:42 GMT
I know your annual tests in Germany are extremely severe compared with most (if not all) other countries. The simple valve fitted to Mk11 cars and I believe your "S" should in theory cause the rear wheels to lock up ie be overbraked if tested to the limit with the car stationary. Do you get a full report from the test centre showing the brake force on each wheel? Regards David Yes, we get the full report with values for each wheel (including hand brake). In most cases (on my old cars) locking up is reached by the handbrake but not by the hydraulic brake. Which makes sense, as the intention of the layout in these pre-ABS times must have been to never have locking rear wheels under any circumstances. I do not remember if the rear wheels locked out on the 1800, but I could look it up in the test report of course. The test is bi-annual btw. a reason for being so strict. But indeed people importing cars from the UK can tell you how much a valid MOT usually has to do with passing the test here... (i.e. not much) Regards, Alexander |
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Post by dave1800 on Oct 5, 2013 1:25:16 GMT
Alexander That would be very helpful if you could look up the 1800 test report and note which of the 3 valves is on your car. It would be helpful if others have records from UK MOTs where they provide brake readings for you thanks. In the road test of MK1 cars they noted that all 4 wheels locked eventually with the car stopping in a straight line. Not sure if this was before they changed the rear wheel cylinder diameters or not. David Yes, we get the full report with values for each wheel (including hand brake). In most cases (on my old cars) locking up is reached by the handbrake but not by the hydraulic brake. Which makes sense, as the intention of the layout in these pre-ABS times must have been to never have locking rear wheels under any circumstances. I do not remember if the rear wheels locked out on the 1800, but I could look it up in the test report of course. Regards, Alexander |
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