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Re: Parking Brake?

Posted by tracksionmotor on Mon Apr 24 22:58:34 2006, in response to Parking Brake?, posted by Train Dude on Mon Apr 24 10:01:47 2006.

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Correct. The M7 parking brake is automatic like the R142 in that there is no parking brake lever. Train stops, air dumps, F end trucks engage parking brakes automatically. IF there is a lack of air in the system unable to engage BIE. You are not misinformed. Difference I see in M7s is that there is a wheel in each cab to mechanically release THE truck engaged in park. Boy did I screw up mixing up Straight Air with Brake Pipe...I do gauging automatically and do not consider 'nomenclature'. IF I remember correctly, R142s have PEBR...Parking Emergency Brake Release. In the WabCo TBU parking brake, there is a tower which contains a bladder and a spring which activates tread brake when pressure lacks...CIs doing undercar who failed to release PEBR and ratcheted the shoe out stripped the internal mechanism. The M7 Knorr disc brakes on F ends works the same way...loss of air engages mechanical presure. Both trainsets will stop, eventually lacking BIE and engaging parking brakes...it has been tested.

Both MTA and industry do not spend the time to teach this stuff. You learn from hands on and working with others. I can make mistakes in descriptions but I know my stuff....I screwed up in brake pipe and straight air nomenclature...the M7 duplex gauge does not display like a R33...a parked car with stored air pressure displays 47 psi straight air and 0 psi brake pipe. I learn everday.

I passed the FRA cert with 98% written and 100% practical...easy for me because I know what to inspect...then the 'book was opened' so everyone would pass. You know how dissapointed I became.

There was an incident where M7s were towed out by TrackMobile and brakes failed. Somebody panicked and hit BCO...BCO is to release brakes...but the loss of pressure engaged parking brakes . Took them an hour to release brakes again. I say nothing.

Thank you Steven for keeping my brain alive. I have four married pairs to get out...laborers don't follow instructions properly and I have to do a lot of repairs and corrective work actions. We get these trainzz out and just maybe I'll be back to CI work. ATB&GB RRCI Peter.

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