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Re: BART's new cars: Why hydraulic brakes instead of air brakes?
Author: Max Wyss
Date: 04-30-2016 - 09:44

Hydraulic brakes are used, but rather rarely in railroad applications.

So far, all I have seen and read about is using as parking brake (also known as hand brake). In a closed system (as a parking brake is), it is essentially unexhaustible. Obviously, it is not used in a closed system on BART, and not as parking brake. This is, IMHO, quite unusual.

One issue I can imagine may be that the components are not really fit for railroad use (vibrations, electrical fields, etc.); OTOH, heavy construction machinery has extensive use of hydraulic drives…

Nowadays, parking brakes are typically spring-loaded brakes. Their biggest advantage is that they are definitely not exhaustible (unless the spring breaks).

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Subject Written By Date/Time (PST)
  BART: Testing equipment wire caused crash, not car or operators J 04-29-2016 - 05:35
  Re: BART: Testing equipment wire caused crash, not car or operators jst3751 04-29-2016 - 11:32
  Re: BART: Testing equipment wire caused crash, not car or operators Peter 04-29-2016 - 13:45
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Margaret (SP fan) 04-29-2016 - 14:17
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Bart 04-29-2016 - 15:40
  Re: BART's new cars: Braking system -- comments, anyone? Margaret (SP fan) 04-29-2016 - 18:39
  Re: BART's new cars: Braking system -- comments, anyone? Edward 04-29-2016 - 19:10
  Re: BART's new cars: Braking system -- comments, anyone? mook 04-29-2016 - 21:51
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? An Observer 05-01-2016 - 09:15
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Another observer 05-01-2016 - 11:00
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Max Wyss 04-30-2016 - 09:44
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Dr Zarkoff 05-01-2016 - 11:32
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? mook 05-01-2016 - 13:45
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Dr Zarkoff 05-01-2016 - 15:09
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Max Wyss 05-01-2016 - 15:24
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Dr Zarkoff 05-01-2016 - 20:20
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Max Wyss 05-01-2016 - 15:17
  Re: BART's new cars: Why hydraulic brakes instead of air brakes? Dr Zarkoff 05-01-2016 - 20:22


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