Brakes And Suspension Flashcards
What are the three types of suspension?
Steel spring
Rubber spring
Rubber torsion
How many pins, bushings and nuts are on a single, tandum, and Tri-axle?
Single- 6
Tandum- 14
Tri-axle- 24
What’s the purpose of a shock absorber?
To control bounce and maintain tire to the road contact
What can worn suspension cause?
Tire wear
Poor handling
Noise
What will loose U bolts cause?
Can cause broken centre bolts
What will a broken rebound clip cause?
Can cause main leaf breakage
How much of a life will an axle flip give you?
4-6 inches
What’s the recommended camber for a axle?
3/8 degree
What’s the recommended toe in angle?
1/8 inch
How often should you re-torque?
After the first 50 and 100 miles
What is static unbalance?
When there’s a heavy spot on a part of the tire or wheel assembly
What’s dynamic unbalance?
Weight of the wheel and tire is uneven towards the edge of the wheel
What will unbalanced wheels cause?
Suspension wear
What is UVW?
Unloaded vehicle weight
What is servo breaking?
When the primary shoe pushes up against the secondary forcing it against the drum.
What causes spongy brakes.
Boiling water or clean fluid
Surge brakes are not used with what kinda hitch?
Equalizing hitches. And cannot be used with friction sway controls
What’s the maximum weight trailer that you can use surge brakes on?
6,000 ibs
What pulls the brake shoes away from the drum?
The return springs
What’s the surface that the magnet comes in contact with?
The armature
What’s the three types of brake controllers?
Inertia
Electric actuator
Hydraulic
What determines the full potential braking?
Battery voltage
How fast do you drive when setting the brake controllers?
40km/h
When adjusting brakes, turn to lock up the back off how many clicks?
5-7. Or till slight drag
At what point do you need to replace brake shoes?
1/32 from rivets
1/16 from bond Line
How much amp draw per brake?
6-7 per axle
Or 3-3.5 amps per brake
How much can you machine off the armature?
0.010”
How much can you machine off the drum surface?
0.030” less the the max diameter
What can you not use of cast iron parts?
Petroleum products
What grease is recommended to use?
Extreme pressure
What’s the minimum sized brake wires?
14 gauge
What’s the blue wire from the brake controllers?
Power to trailer brakes
What the red wire from the brake controllers?
Cold side of the brake light switch
What’s the maximum you can hone off a hydraulic brake?
0.005”
