Comeng Faults - Brake Component Faults

Question 1

If the brake pipe does not charge after the BVIC is open and handle in release, what is the drivers first task?

Answer 1

Check main res to brake control, if it is closed, open it and if it is open, close it

Question 2

After closing main res to brake controller, what is the drivers duties?

Answer 2

Trip EP circuit breaker
Go from emergency to run and release several times to clear the air from the brake controller
Reopen main res to brake control
Try recharge the brake pipe

Question 3

If step 2 of the charging valve procedure doesn’t work, what is the drivers duties?

Answer 3

Leave the brake in step 7 and BVIC open
Go to another cab and open the BVIC and charge from the other cab
Cut out in the second cab (apply and isolate) and look to ensure the brake pipe is charging from the lead cab via the gauges in the second cab

Question 4

What needs to happen if all remedies fail to open the charging valve?

Answer 4

Competent employee is needed to charge your brake pipe from another motor car by opening a second BVIC and closing it once it has recharged

Question 5

What does it mean if the lockout magnet valve is defective in the closed position?

Answer 5

It means the automatic air brake will not come on and fail to allow a brake pipe reduction

Question 6

What is the procedure for a lockout magnet valve defective in the closed position?

Answer 6

Brake handle into emergency
Contact train control
Run on EP
No faster then 15km/h into a siding

Question 7

What is the effect of the lockout magnet valve defective in the open position?

Answer 7

Simultaneous application of automatic air and EP/rheostatic brake

Question 8

What damage can be done with the lockout magnet valve defective in the open position ?

Answer 8

Wheel flats
Skidding
Rough stops

Question 9

What is the procedure to remedy a lock out magnet valve stuck in the open position?

Answer 9

Run on the air

Question 10

With a loss of overhead power and a driver needs to brake immediately, what would the driver be required to do and why?

Answer 10

Emergency application due to the instant loss of EP/rheo combined with the delay in the automatic air brake applying

Question 11

What must happen when you cannot reset the emergency application valve (hand pilot valve)

Answer 11

Turn the red EC and run on the secondary safety circuit

Question 12

What is the consequences of a release prevention valve failing?

Answer 12

Moving brake handle towards release will slightly recharge the brake pipe but fully release the brakes

Question 13

With a defective release prevention valve, what should you do?

Answer 13

Drive using EP submit a tmm

Question 14

How would you tell the difference between a leak in the brake pipe and a defective regulating valve?

Answer 14

Charge the brake pipe and close the BVIC
If air depletes it is a ruptured brake pipe
If it stays at a pressure less then 550kpa it is the regulating valve

Question 15

If the brake pipe pressure doesn’t fall after the BVIC is closed what is the next steps?

Answer 15

Brake into emergency
Open BVIC
Handle to release
If it does not charge to 550kpa the regulating valve is defective

Question 16

What KPA range in the brake pipe is permissible for operation?

Answer 16

425-550kpa and it is suggested to use the EP unless a fault is found on the ep/rheo

Question 17

If the brake pipe won’t charge above 425KPA what is the procedure?

Answer 17

Train disabled

Question 18

Can a train still be driven when the brake handle is moving up the service zone to a higher notch of braking?

Answer 18

Yes but submit a tmm

Question 19

If the brake handle is moving to the release position, what is the procedure?

Answer 19

Run on the air

Submit tmm

Question 20

At what percentage should a brake block be reported as worn?

Answer 20

10% worn

Question 21

Is a train able to come into service at 10% worn?

Answer 21

Yes

Question 22

When would a brake block be deemed not fit for service?

Answer 22

When the backing plate is showing, in this case we isolate the bogie and report it

Question 23

At what percentage of the total surface area of a brake block needs to be addressed?

Answer 23

50% and the bogie just be isolated and a TMM filed

Question 24

What measurement should brake piston travels be?

Answer 24

30-65mm

Question 25

What circuit breaker affects the train lined spring park brakes?

Answer 25

Compressor governor circuit breaker

Question 26

If the emergency application valve fails, what do we isolate?

Answer 26

Red Ec