Reasons of the vehicle’s pulls from a rectilinear motion.

 

Reasons of the vehicle’s pulls from a rectilinear motion.

 

Why is the car pulled to one side?

Often, motorists face with this problem – pulls vehicle to one side. One or several reasons can be a consequence of this vehicle’s core on the road. Moreover the action of some counteracts the other. And the removal of one gives the opportunity to appear to others. And some action is the consequence of the others. These reasons are more than two hundred. Consider some often occurred reasons and ways of their removal. The use of different size, according to the manufacturer or generally unsuitable vehicle units and components was not considered.

Tires, discs.


1. There is a different pressure in the right and left wheels.
The difference of more than 0.2 bar. Flat tire has a large elasticity and large surface area of contact with road surface and thus a greater friction coefficient. It is necessary to adjust the tire pressure.


2. There is a different pattern of the right and left wheels.

Different pattern and therefore different tires. The same size tires, but different outline patterns can vary the weight, elasticity and friction with the road surface. It is necessary to replace tires or move wheels.


3. There is a different treed‘s height on the right and left wheels.

Different uniform tread wear, and so different tires. The same size tires but different wear tread may vary the weight, elasticity and friction with the road surface. It is necessary to replace or move the wheels.


4. There is an uneven tire wear wheels.
Uneven tire wear is a consequence of:
- not correct angles installation wheels alignment and level suspension;
- not correct wheel balancing;
- not an apt tires outline;
- not correct installation of wheels on the directing;
- disrepair or unit backlash suspension and steering wheel trapezoid.


It is necessary to replace the tires or move the wheels. Correct or replace suspension units and steering trapezoid. Correctly install the wheel on the directing.


5. Tires are sharpened under other angles.

The long operation of car tires with the wrong angles installation wheels and the suspension level led to a one-sided uniform tire wear. It is necessary to change or move the wheels.


6. Tires are sharpened under other rotation.

It is necessary to move the wheels.


7. There is a carcass deformation of the tires cover wheels.

There is no carcass deformation tire with running on the road pothole at low pressure in the tires or hard running on road pothole as a result of beats, but there is the pulls. It is necessary to change the tires or move the wheels.


8. There is a gap metal cord in the tire.

There is a gap metal cord tires with running on the road pothole at low pressure in the tires or hard running on road pothole. As a result, there is a thin wear strip on circle opposite the disc side with the inner or outer tire side. It is necessary to replace the tires.


9. There is a run out of the wheel tires.

Run out of the wheel tires are with running on the road pothole at low pressure in the tires or hard running on road pothole. As a result, there is a radial or diagonal tires run out, which is called as "bump", "finger". It is necessary to change the tires, balance the wheels or change the wheels.


10. There is a wrong wheel balancing.

It is necessary to balance the wheels.


11. There is a disk run out (radial or diagonal).

It is necessary to roll the disks and to balance the wheels.


12. There is a wrong wheel assembly.

The tire sits wrong in the disk. It is necessary to re-assemble and balance the wheels.


13. There is a wrong wheel fastening.

Properly set the wheels on the directing.


14. There is a different wheels weight.

The wheels, disks, tire covers and balancing small loads weight total or separately on the right and left wheel is different.  It is necessary to move the wheels.


15. There is an asymmetrics tires.

It is observed the cases of using tires with an asymmetric tread outline, when riding on wet surface and even on dry accompanied with pulling the vehicle to one side. It was caused by the unidirectional drainage canals and lamella tires.


16. There is a difference of wheels.

The difference between the wheels is not revealed but is there a pull? This item excludes all previous paragraphs of section It happens even on new wheels, tires and disks. It is necessary to move the wheels.

 

There are wheels angles.

 

17. Convergence does not affect on the pulls!

Convergence does not affect on the pulls! Exclusion is a paragraph 19.
The large value of the convergence angle, more than 0°25' blunts pulls. Correction of the convergence angle can resume pulls if any reason from this list exists. The vehicle pulls very often is shown after the adjusting the convergence angles.


18. Convergence, difference dynamics.

The difference of dynamics right and left convergence angle is more than 0°05'. The angle dynamics: the no-load angle difference - load angle difference.


19. There is an axial load.

The convergence difference of the front and rear axis is more than 0°03'.


20. The camber angle front or rear axis is broken.

The difference of right and left camber angle for front axis is more than 0°15' - 0°40', for rear axis is more than 0°40' - 1°00'. Adjust, substitute the suspension unit.


21. The camber angle difference of dynamics.

The difference of dynamics the right and left angle is more than 0°10' - 0°30'. The angle dynamics, the difference angle without load - load. Substitute the suspension unit. Correct the body geometry. I


22. The castor angle is broken.

The difference of right and left castor angles is more than 0°15' - 0°40'.
Adjust, replace the suspension unit. Correct the body geometry. I


23. The castor angle difference dynamics.

The difference dynamics of the right and left castor angle is 0°10' - 0°30'.
The angle dynamics: the angle difference without no-load - load. Replace the suspension unit. Correct the body geometry. I


24. The rear castor angle is broken.

The difference of right and left rear castor angles is more than 0°30' - 1°00'.
Adjust, replace the suspension unit. Correct the body geometry. I


25. The King Pin Inclination (KPI) or Steering Axis Inclination (SAI) angle is broken.

The difference of right and left King Pin Inclination (KPI) or Steering Axis Inclination (SAI) angle is more than 0°50'. Replace the suspension unit. Correct the body geometry.


26. King Pin Inclination (KPI) or Steering Axis Inclination (SAI) angle difference dynamics.

Difference dynamics right and left King Pin Inclination (KPI) or Steering Axis Inclination (SAI) angles is more than 0°20'. Dynamics of the angle: the angle difference without load - load. Replace the suspension unit. Correct the body geometry. I


27. King Pin Offset.

The difference of right and left King Pin offset angle is more than 0°10'. Change the steering knuckle, control arm.

.


28. Angles of rotation of the wheels.

The difference of rotation angles to the right and to the left. Adjust, replace the suspension unit. II


29. The wheels base.

The offset longitudinal front or rear axis.

The difference of right and left sides. Adjusted, replace the suspension unit. Correct the body geometry.


30. Offset axis.

Lateral displacement of front or rear axis. Adjust, replace the suspension unit. Correct the body geometry.

 

I.  It is very difficult to identify the cause, the more to correct, there is as usually the result of an accident skewed suspension unit, steering or body.
II. There is an improper assembly of the steering gear, steering column or the steering wheel.

The steering wheel is centered steering rack i.e. number of turns the steering wheel to the right – left should be identical.


There is a car misalignment from a spring suspension components and
active suspension system.


31. Springs.

Springs. Replace.

32. Leaf spring.
Leaf spring. Replace.

 

33. Torsion bars.

Torsion bars. Adjust, replace it.

 

34. Active suspension units:
a) air suspension;
b) a system of radar or laser cruise control;
c) stabilization system and exchange rate stability.
Adjust, replace the suspension unit.

35. The air suspension calibration.

Air suspension "Level Control" and the stabilization system are not calibrated. Calibrate.

Steering.


Backlash and bending elements of steering trapezoid.


36. Tie rod.

Backlash and bending tie rod. Replace.

37. Tie rod end.

Backlash and bending tie rod end. Replace

38. Adjusting sleeve.

Backlash and bending adjusting sleeve. Replace.

39. Pendulum, the pendulum arm.

Backlash and bending pendulum the pendulum arm. Replace.

 

40. Steering box, the pitman arm.

Backlash and bending, steering box and pitman arm. Replace, tighten.

41. Steering arm of the knuckle, steering arm of the strut.
Steering arm of the knuckle, steering arm of the strut is bent. Replace.

 

42. Faulty power steering mechanics.

(Hydro, Hydro Electric and Electricity), the mechanics does not work out.

43. Faulty power steering electronics.

(Hydro, Hydro Electric and Electricity) ESP does not work, a position sensor lath, electronics does not work out.


44. Systems mistakes.

This item includes the errors or failure electronic systems which are responsible for the work of one or different systems, subsystems of checking and control the car: CDC, IDS, EHPS, ABS, ESP, ADB, DSC, ADBX, ASR, ETS, TC, BAS, EBS, ACC, ADR, PSM, VSC, VDCAFS, VCRS.

Suspension

Backlash of the suspension parts.

45. Stop upper.

Stop upper. Replace.

46. Ball Joint.

Ball Joint. Replace

47. Silentblocks.

Silentblocks. Replace.

48. Leading.

Leading. Replace.

49. Threaded connections.

Threaded connections. Replace.

50. Bearings.

Bearings. Replace.

There is a deformation of the suspension parts.

51. Control Arm.

Control Arm. Replace.

52. Strut.

Strut. There is a rod bend or base in the attachment
place to the steering knuckle. Replace.

53. Steering knuckle, knuckle.

Steering knuckle, knuckle. Replace.

54. Bearings

Bearings replace.

55. Wheel hub.

Wheel hub replace.

56. Axle.

Axle or stretcher replace.

57. Strut Mount.

There is a defective upper support struts characteristic grinding, squeak, click replace.

58. Shock absorber’s.

There is different shock absorber’s work. On the "washing board" replace.

Body.

Deformation, the sag of the body elements.

59. The longitudinal.

The longitudinal. Correct the geometry of the body.

60. Brackets.

Brackets. Correct the geometry of the body.

61. Body.

Body. Correct the geometry of the body.

Braking system.

62. Clamps brake.

Clamp brake pads, brake cylinder, or cable parking brake. Uneven distribution of braking efforts at the wheels.


63. Uneven wear brake discs.

Uneven wear, warping brake discs drums (when braking).

Transmission.

64. The constant velocity joints is defective.

There is a fall of the torque to the wheel CV Joints, different angular velocity. Replace.

65. The differential main gear is defective.

There is an uneven distribution of torque to the wheels. Replace.

66. There is a beating of half axle.

There is a fall of the torque to the wheel. Replace.

67. The pulls of tractor car may be due to differences of the
length of half axles.

 

Another.

68. Uneven disposition of cargo and passengers.

69. Crosswind, wind age.

70. Road slope.

71. Computer stand camber toe is not calibrated.

Computer stand camber toe is not calibrated, everything is all right the printout but in fact there are paragraphs numbers: 18. 19. 20. 22. 25. 29. 30. [Ask the term calibration, check on the another booth] (Calibration of infrared booth DCC is once an half of the year - once a year).

 


 Yapasha RWE v8.0
4 2005-2011

How can you beat the car pulls from the rectilinear motion?

Move the front wheels seats on the tire (even if it is directed). If it is changed you have to check the disc, tire on the beat and balancing. If it is not changed you have to find a camber toe specialist who will call at least 10 reasons of the car pulling.
Wheels-alignment, difference angles "castor" "camber" right and left wheels have to be no more than 0°20'