Brakes unable to stop runaway Lexus in California?
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From: dsi1 on 16 Nov 2009 17:22 Heron McKeister wrote: > "hls" <hls(a)nospam.nix> wrote in message > news:sJWdnfF9FOHXI5zWnZ2dnUVZ_oKdnZ2d(a)giganews.com... >> "Ray O" <rokigawa(a)NOSPAMtristarassociates.com> wrote in message Before >> power assisted brakes were introduced, people >>> routinely stopped vehicles by stepping hard on the brake pedal. >> That is true, Ray, but also in those days we had front and rear drums, for >> the most part. >> Discs required a lot more pressure than drums, hence the power assist > brakes >> became >> a necessity rather than just a luxury convenience. > > > I had 4 wheel disc brakes on my '74 Fiat 124 Spyder, > was the best stopping vehicle I had owned at the time > and it neither had nor required power assisted brakes. > > I've had several 1972 Fiat 124 Sports Coupe. They all had standard vac operated brake boosters. The coupes also had a valve that measured the angle of the body to the rear axle and reduced line pressure to the rear disks on hard braking to prevent the rear wheels from locking up. A nifty idea.
From: hls on 16 Nov 2009 17:46 "dsi1" <dsi1(a)humuhumunukunukuapuapa.org> wrote in message news:ugkMm.51080 > I've had several 1972 Fiat 124 Sports Coupe. They all had standard vac > operated brake boosters. The coupes also had a valve that measured the > angle of the body to the rear axle and reduced line pressure to the rear > disks on hard braking to prevent the rear wheels from locking up. A nifty > idea. Now that you mention it, a friend of mine has an Alfa Romeo from that time period. It has vacuum, but gets it in a strange way. Ive seen it, and my friend has attempted to explain it, but I am not satisfied that I understand it completely. A vacuum line is tapped into the head near the exhaust port. I dont know that it goes directly to manifold vacuum or what. Maybe someone here knows the details of this unusual bit of Italianism.
From: dsi1 on 16 Nov 2009 17:47 N8N wrote: > Well, you're both right - discs *do* require more line pressure than > drums, but a Fiat Spyder is a fairly light car so it doesn't matter > all that much. I used to have a Porsche 914 with manual discs, but in > general, manual discs are pretty rare and unlikely to be found on > anything but small, light sports cars. > > nate My brother had a 914. It was a great beauty. Too bad the brakes sucked. I guess there's no such thing as stop-and-go traffic in Germany. :-)
From: dsi1 on 16 Nov 2009 18:06 hls wrote: > > "dsi1" <dsi1(a)humuhumunukunukuapuapa.org> wrote in message news:ugkMm.51080 >> I've had several 1972 Fiat 124 Sports Coupe. They all had standard vac >> operated brake boosters. The coupes also had a valve that measured the >> angle of the body to the rear axle and reduced line pressure to the >> rear disks on hard braking to prevent the rear wheels from locking up. >> A nifty idea. > > Now that you mention it, a friend of mine has an Alfa Romeo from that > time period. > It has vacuum, but gets it in a strange way. Ive seen it, and my friend > has attempted to > explain it, but I am not satisfied that I understand it completely. A > vacuum line is tapped > into the head near the exhaust port. I dont know that it goes directly > to manifold vacuum > or what. Maybe someone here knows the details of this unusual bit of > Italianism. That's interesting - I don't know anything about that. The Alfa I had was a little weird too. It had a SPICA mechanical fuel injection that was like a analog/mechanical computer whose workings scared me to death. The transmission and clutch was in the rear end which means the driveshaft spun at engine speeds which means the driveshaft had to be balanced to a high degree but it never was. It also had nifty inboard disk brakes and a DeDion rear suspension. The specs were advanced for the time but it was pretty much all a technological dead end.
From: hls on 16 Nov 2009 18:13
"dsi1" <dsi1(a)humuhumunukunukuapuapa.org> wrote in message news:mVkMm.29242 > The Alfa I had was a little weird too. It had a SPICA mechanical fuel > injection that was like a analog/mechanical computer whose workings scared > me to death. The transmission and clutch was in the rear end which means > the driveshaft spun at engine speeds which means the driveshaft had to be > balanced to a high degree but it never was. It also had nifty inboard disk > brakes and a DeDion rear suspension. The specs were advanced for the time > but it was pretty much all a technological dead end. Italian engineering.. such beautiful concepts, such wonderful carrozeria, such pissant results, usually. |