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Whoops
https://www.miataturbo.net/attachmen...ine=1350491065 https://www.miataturbo.net/attachmen...ine=1350491065 https://www.miataturbo.net/attachmen...ine=1350491065 https://www.miataturbo.net/attachmen...ine=1350491065 https://www.miataturbo.net/attachmen...ine=1350491065 https://www.miataturbo.net/attachmen...ine=1350491065 https://www.miataturbo.net/attachmen...ine=1350491065 Hydraulic brake pressure switch for the lights failed at a very bad time. I'm not gonna lie I might have tagged the barrier anyway, just not as hard. No injuries, no frame damage, and other than the root cause of the brakes just cosmetic. I HIGHLY recommend that you do not use a hydraulic brake light switch. Do it the right way and use a normally closed electric switch. |
Ouch! Glad the frame is ok.
Fun fact: The Volkswagen that your engine came out of used a hydraulic brake light switch. Two of them, in fact- one on the front circuit and one on the rear. In addition to turning on the brake lights, they also acted as a warning system. If a state-mismatch was detected (pressure on one circuit but not the other) it lit up an idiot-light on the instrument cluster. |
So, when you say 'failed' you obviously mean it popped and you lost brake pressure on one circuit?
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Originally Posted by Joe Perez
(Post 940261)
Ouch! Glad the frame is ok.
Fun fact: The Volkswagen that your engine came out of used a hydraulic brake light switch. Two of them, in fact- one on the front circuit and one on the rear. In addition to turning on the brake lights, they also acted as a warning system. If a state-mismatch was detected (pressure on one circuit but not the other) it lit up an idiot-light on the instrument cluster.
Originally Posted by vehicular
(Post 940265)
So, when you say 'failed' you obviously mean it popped and you lost brake pressure on one circuit?
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Originally Posted by golftdibrad
(Post 940315)
That is a fun fact. Its still a bad freaking idea. :facepalm:
Gotta hand it to the Germans- they think of everything. :D |
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I like Pook's stuff but I have a street legal go kart I am planning on salvaging parts off of
Here is my current buggy https://www.miataturbo.net/attachmen...ine=1350510592 https://www.miataturbo.net/attachmen...ine=1350510592 And I got a GSXR 1000 bike im scrapping for parts to make this https://www.miataturbo.net/attachmen...ine=1350510592 https://www.miataturbo.net/attachmen...ine=1350510592 |
That is pure sex.
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Details or at least a name of the car?
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What is that?
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Looks like an RCR Superlite Nemesis.
SuperLite Cars Made in the USA, Engineered to Win on the Street and Track by Race Car Replicas Hayabusa engine, 1,098 lbs. $20k for the rolling chassis kit. https://www.miataturbo.net/attachmen...ine=1350527824 |
I gotta say, that's about as close as it gets to driving an indy car
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I don't know. I think the V8 Atom is more like it. Except for the two seater part.
https://www.miataturbo.net/attachmen...ine=1350537544 |
so you're brake lights activate when the pressure in the lines reaches a certain point? and that adapter-thingy broke and caused you to lose brakes?
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Originally Posted by Braineack
(Post 940606)
so you're brake lights activate when the pressure in the lines reaches a certain point? and that adapter-thingy broke and caused you to lose brakes?
https://www.miataturbo.net/attachmen...ine=1350566908 |
That is an interesting way to do things, but the blaring fact of that being one more possibe failure point (and a very dangerous one at that) makes me wonder why an engineer would choos to do this.
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but a simple mechanical switch on the pedal itself is way too eay.
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Originally Posted by mx5autoxer
(Post 940655)
That is an interesting way to do things, but the blaring fact of that being one more possibe failure point (and a very dangerous one at that) makes me wonder why an engineer would choos to do this.
Originally Posted by Braineack
(Post 940658)
but a simple mechanical switch on the pedal itself is way too eay.
The only advantage I see is its an actual indication of line pressure and the fact that the car is slowing, rather than a pedal switch that is an indication of the intent to apply line pressure. IMHO its semantics, because a failure either way does not change the fact that you may not stop. a failure of either a pressure or electric switch will not change the fact that you may stop without indication. |
Originally Posted by golftdibrad
(Post 940669)
I have no clue. I'm thankful at least my car has two braking circuits; could you imagine what happens on a street car that only has one?
I'm not aware of any street car which hasn't had dual-circuit brakes since at least the 1960s. The Beetle got them as part of the 1967 redesign. Most cars use only a single fluid reservoir, but the master cylinder itself is internally split into two isolated circuits, with each serving two wheels. Most commonly front-back, however I have seen some cars with diagonal splits. Its even more puzzling considering the state of the art of material science back then; a simple electrical switch, even with redundancy, is far more simple. |
Originally Posted by Joe Perez
(Post 940737)
?
I'm not aware of any street car which hasn't had dual-circuit brakes since at least the 1960s. The Beetle got them as part of the 1967 redesign. Most cars use only a single fluid reservoir, but the master cylinder itself is internally split into two isolated circuits, with each serving two wheels. Most commonly front-back, however I have seen some cars with diagonal splits. |
Originally Posted by Joe Perez
(Post 940737)
A lot of things about the VW design are an interesting conundrum. Every one I have ever driven, for instance, had a pair of little levers positioned right by the e-brake handle whose sole function seemed to be to let just enough carbon monoxide into the cabin to make you stop caring about the fact that you are freezing cold and your front windshield is completely fogged up.
I solved this problem by not having a windshield. Or brake lights. http://www.diyautotune.com/images/ca...jects/Ben1.png |
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