Pneumatics

Question 1

What are the two safety valves fitted to the compressor? And what kpa are they set at?

Answer 1

• between compressor and air dryers 1100
• between air dryers and MR 1050

Question 2

What do the levelling valves do?

Answer 2

Inflate or deflate the air bags according to passenger loads

Question 3

Where and how many leveling valves are there

Answer 3

M car - 1 per bogie
T car - 2 on bogie 1 and 1 on bogie 2

Question 4

What brakes are there? (4)

Answer 4

• service
• holding
• Emergency
• park brake

Question 5

What type of brakes does the service brake use?

Answer 5

ED and EP

Question 6

T cars only use one type of brake, what is it?

Answer 6

EP friction brakes

Question 7

When does the holding brake apply?

Answer 7

0/coast

Question 8

Holding BC pressure?

Answer 8

110

Question 9

B6 pressure?

Answer 9

189

Question 10

Emy BC pressure?

Answer 10

280

Question 11

Main res operating pressure?

Answer 11

850 - 1000

Question 12

Emergency brake uses what only?

Answer 12

EP friction brake

Question 13

When does the park brake apply? (2)

Answer 13

• When the key is turned off
• when MR falls below 350

Question 14

Park brakes are on which wheels?

Answer 14

3 and 7 of each car

Question 15

What percentage of braking effort does ED braking have to fall below before dropping out during wheel slip? What piece of equipment decides this?

Answer 15

90% and EP takes over and the TCU does this

Question 16

How do you reset ED braking during wheel slip?

Answer 16

Into coast or any powering position for min 1 sec before moving to a brake position

Question 17

The sanders don’t operate when… (3)

Answer 17

• powering
• ED braking
• speed below 5km

Question 18

Compressed air is supplied to what equipment? (6)

Answer 18

MR
Aux res
Surge res
Whistle
Service (friction) brake
Park brake

Question 19

Air suspension equipment? (3)

Answer 19

Levelling valves
Air bags
Surge res