25FT RB-S Trailer Information Flashcards
1
Q
Do not tow the boat unless you have a truck and complete hitch system capable to tow at least ___
A
10,000 lbs
2
Q
TIN is how many digits?
A
15
3
Q
First digit of TIN
A
Trailer designator
4
Q
Second digit of TIN
A
Model year
5
Q
Third digit of TIN
A
Finish
6
Q
4th - 8th digit of TIN
A
5 digit VIN code
7
Q
9th digit of TIN
A
Number of brake axles
8
Q
10th digit of TIN
A
Type of brakes
9
Q
Last 5 digits of TIN
A
5 digit capacity
10
Q
TIN trailer designator
A
K
11
Q
TIN finish designators
A
A=aluminum B=Black C=Cream W=White G=Galv etc
12
Q
2nd digit of TIN same as ___ digit of VIN
A
10th
13
Q
TIN type of brakes designators
A
0=none 1=hyd drum 2=disc 3=electric 4=hyd drum with park brake
14
Q
Model year code for TIN
A
A=1980
skips I, O, Q, U, Z
1 - 9
A=2010
15
Q
Repack bearings how often?
A
At least once a year
16
Q
The backing plate or caliper mounting bracket is held with ___
A
7/16x1” or2/8x1” bolts
17
Q
To pack a bearing ___
A
Press the grease into the rollers
18
Q
Install nut a preload to ___, back the nut off, and retighten ___
A
30 ft/lbs
Finger tight
19
Q
While installing the retainer take note to line up the ___ with ___
A
Hole in the spindle
A hole in the retainer
20
Q
Apply grease with a grease gun to the bearing protector until ___
A
The springs starts to compress
21
Q
Adjusting hydraulic drums, tighten until the drum can no longer turn, then back off ___ clicks
A
7 - 10
22
Q
Inspect pads for ___
A
Evidence of excessive or uneven wear
23
Q
Inspect rotors for ___
A
Evidence of excessive wear, scoring, excessive heat build up, cracks, warpage
24
Q
Inspect master cylinder for ___
A
Proper fluid level
25
Inspect all bolted connections for ___
Tightness
26
Inspect calipers and brake lines for ___
Evidence of brake fluid leaks
27
Recommended caliper mounting location
3 o'clock on left side
| 9 o'clock on right side
28
if runout is excessive ___
Clock the rotor
29
Install caliper with bleed screws facing ___
Up
30
Caliper seals, o-rings, etc, are installed with ___
A special silicone based grease
31
Surge brake actuators have normally ___ solenoid reversing valves
Closed
32
The solenoid reversing valve is energized by connecting them to ___
The tow vehicles back-up light circuit
33
Solenoids come in two types
Normally open
| Normally closed
34
Advantages of a normally open solenoid reversing valve
Quick and easy to install
35
Disadvantages of a normally open solenoid reversing valve
- The solenoid merely traps the pressurized brake fluid if it is stopped at a downhill attitude
- If the trailer hits any significant object while backing up, the entire force of the impact is transferred to the master cylinder piston seal, and can rupture
36
Advantages of a normally closed solenoid reversing valve
Eliminates disadvantages of normally open solenoid
37
Disadvantages of a normally closed solenoid reversing valve
- Require a few additional fittings, a short length of brake line, and may require drilling and tapping an access hole in the master cylinder reservoir for a return line
- Some OEM's terminate the return line into the top of the master cylinder reservoir through a hole in the fill cap, this may permit water or water vapor to get into the brake fluid
38
Solenoid valves with one wire are ___
Internally grounded case
39
Solenoid valves with two wires are ___
Ungrounded case
40
Two wire solenoid wires are ___
Interchangable, polarity is not an issue
41
Solenoid must have ___ marked on the housing
"in" and "out"
42
Older hydraulic drum brake systems require that a ___ be maintained in order to keep the wheel cylinder piston seals seated
10 - 12 psi
43
To accomplish keeping residual line pressure, many surge brake actuators have a ___ installed just inside of ___
- Diaphragm type check valve
| - Master cylinder output port
44
Make sure the surge brake actuator for disc brakes is designed specifically for disc to avoid ___
Subjecting the system to any residual brake line pressure
45
When bleeding a brake system that includes a normally closed solenoid reversing valve, bleed at least one cycle with ___, to avoid ___
- 12V applied to the solenoid
| - Trapping air at the valve
46
Bleed which caliper first?
Furthest from the actuator
47
After bleeding, ensure ___
Master cylinder reservoir is filled, and all bleeder screws are tight
48
Bleeder should point up so as to ___
Properly expel trapped air
49
Kodiak recommends bleeding the system again after the first ___ of towing
100 miles
50
Hub assemblies should be in what temperature range?
130 F to 175 F
51
The Kodiak caliper uses ___ friction pads, specify pad ___
- GM replacement
- #D-289 organic for Model #225 (same as 1980 - 1990 Buick Skylark - front) and #MD-215 semi-metallic for Model #250 (same as 1983 - 1995 Buick Century H/D- front)
52
Caliper fittings are ___
Brass
53
Probable cause, trailer can not back up surge braked trailer
12V solenoid valve is inop
54
Remedy for 12V solenoid valve inop
- Check tow vehicle back-up light circuit, check solenoid (should hear a click when 12VDC is applied to lead wire)
- Check connection to back-up light circuit
- Check trailer ground connection
55
Probable cause, squeaking, clatter, or chucking (without surge brakes)
- Loose hitch ball
- Loose hitch
- Hitch ball worn or too small
- Broken rotor
- Worn out caliper pads
- Leaky caliper
- Leaky wheel bearing grease seal
- Caliper/Mounting bracket bolts loose
- Spindle nut loose
- Lug nuts loose
56
Probable cause, squeaking, clatter, or chucking (with surge brakes only)
- Worn out shock absorber in Surge Brake Actuator
- Linkage and pivots on the brake actuator
- Bent push rod in the shock absorber
- Bent master cylinder actuating rod
- Damaged coupler assembly
- Low brake fluid level in master cylinder
57
Probable cause, one brake overheating, side pull, poor brake performance
- Caliper piston not retracting
- Bent guide bolt/caliper mounting bracket
- Side pull
58
Probably cause, all brakes overheating, poor brake performance
- Foreign material in brake line
- Low hydraulic fluid level
Broken or pinched brake lines
- Residual pressure in brake line
- Brake actuator frame damaged (surge brake actuators only)
59
Check the wheel nut torque at ___
10, 25, 50, and 250 miles
60
Check brake adjustment at ___
250 miles, every 1000 miles, as performance requires
61
Brake drum should be no more than ___ out of round
.020"
62
7" brake drum maximum bore diameter
7.090"
63
10" brake drum maximum bore diameter
10.060"
64
12" brake drum maximum bore diameter
12.090"
65
For electric brakes, the second surface to inspect is ___
Where the brake magnets contacts the inner face on the brake drum, called the armature face
66
When the armature face is out-of-flat by more than ___, the face needs to be turned
.020"
67
Any time the armature face is turned to clean up excessive wear, the ___ should also be replaced
Brake magnets
68
Probable cause, no brakes (disc)
- Broken or kinked brake line
| - Malfunctioning actuation system
69
Probable cause, weak brakes (disc)
- Worn or contaminated pads
- Incorrect brake pads
- Frozen master cylinder/caliper cylinder
- Glazed brake pads
- Excessive rotor face wear
- Trapped air in lines
- Overloaded trailer
- Faulty actuator
70
Probable cause, pulls to one side (disc)
- Incorrect tire pressure
- Unmatched tires on same axle
- Restricted brake lines or hoses
- Malfunctioning caliper
- Defective brake pads
71
Probable cause, dragging brakes (disc)
- Unpunctured check valve
- Blocked master cylinder
- Improper brake fluid
72
When installing hydraulic drum brakes, the ___ shoe must face the front of the trailer (disc)
Primary or short
73
Electric brake synchronization adjustments
1. System resistor - regulates max braking power of trailer brakes
2. Brake controller - controls the tow vehicle brake line pressure at which the controller will begin to pass current to the trailer brakes
74
Before synchronization adjustments are made, your trailer brakes should be burnished in by ___
Making 10 to 12 full stops from about 20 mph
75
If the trailer brakes lock and slide, ___ (electric)
Add more resistance to the circuit with the system resistor
76
Adjust the brake resistor just to the point of ___ (electric)
Brake lock up and wheel skid
77
Make a number of 30 mph hard stops, if the trailer brakes lag behind, adjust the ___ (electric)
Brake controller
78
The brake controller should be adjusted so that ___
The trailer brakes come in just slightly ahead of the tow vehicle brakes. There should be no jerking or pushing sensation.
79
Grease for brake anchor pin
Lubriplate
80
Mounting components for leaf spring suspension need to be inspected at least every ___
6000 miles
81
1/2" U-bolt torque (leaf spring)
45 to 60 ft/lbs
82
Lug nut cone angles
60 or 90 degrees
83
Cause of center wear on tire
Over inflated tire
84
Cause of edge wear on tire
Under inflated tire
85
Cause of side wear on tire
Loss of camber or overloading
86
Cause of toe wear on tire
Incorrect toe-in
87
Cause of cupping wear on tire
Out of balance
88
Cause of flat spots on tire
Wheel lockup and tire skidding
89
How much of the load should be on the tongue?
8 to 10%
