Malfunctions of the front suspension, such as bends in the beam, upper and lower arms, wear of upper and lower ball pins, knuckles, liners, rubber bushings, lead to a change in the steering angle of the wheels, which leads to poor steering, excessive fuel consumption, and tire wear. Malfunctions of suspension elements affect the smoothness of motion and stability of the vehicle when it moves. If other parts in your car are broken in addition to the suspension, consider contacting a company that gives a lot of money for scrap cars in etobicoke.
Possible malfunctions of the front suspension and front wheels can be: noise and knocking when the vehicle is moving.
Causes of the malfunction are as follows:
loosened mounting brackets or joints of the stabilizer bar, front suspension knuckle, steering trapezium arm, strut support (tighten the loose threaded joints);
wear of rubber element of telescopic strut support or deformation of its fittings flanges (replace worn parts or straighten flanges);
increased imbalance of front wheels (balance wheels or swap them out);
worn front wheel bearings or loose hub nut (replace bearing, tighten nut);
wear of ball joints of front suspension and steering mechanism (replace worn joints);
sagging or breakage of front suspension spring (replace spring); destruction of compression or rebound buffers (replace buffers).
The main causes of the vehicle deviating from the straight-ahead direction can be:
violation of steering axle pitch angles (adjust steering axle pitch angles, ensure difference in left and right side angles);
front wheel camber (adjust camber angles of front wheels, ensure difference of camber angles of left and right sides);
unequal pressure in tires (set normal pressure);
destruction and slump of one of the supports of telescopic strut (replace the support);
unequal settlement of the front suspension springs (replace the settled spring);
unequal tire bead stiffness (change the direction of rotation of the tire or move the tire to the other side);
large difference in tire wear (replace worn tire).
The main causes of uneven or increased tire tread wear can be:
misalignment and misalignment of the front or rear wheels (adjust wheel angles);
the engine is running too fast when turning (do not jack-knife the wheels when turning);
overacceleration of the vehicle with slipping of driving wheels (avoid overacceleration of the vehicle with slipping of wheels);
frequent use of locking brakes (do not let the vehicle skid when braking);
overloading the vehicle (do not overload the vehicle);
excessive wheel imbalance (imbalance the wheels);
the shock-absorber bar does not work (replace the shock-absorber bar);
bent longitudinal members or mounting brackets of stabilizers and suspension arms (straighten damaged parts or replace them with new ones)
increased wear of ball joints and rubber-metal joints of suspension and steering drive (repair suspension with replacement of worn parts).
The main cause of wheel wobble is improper balancing. If wheel angles cannot be adjusted, the main causes are:
Deformation of the axle of the lower arm;
deformation of the suspension cross member in the area of the front bolts securing the axles of the lower arms;
Deformation of the knuckle, suspension arms, or front body components of the vehicle.
Removing and installing the front suspension of rear-wheel-drive vehicles. To remove the front suspension mount the car on an elevator or inspection ditch, tighten the parking brake, remove the front wheels and holding a wrench end of the shock absorber rod by the flats, detach the upper end of the shock absorber. Unfastening the locking plates, unscrew the bolts securing the caliper to the bracket, take the caliper aside and fix it so it is not hanging on the hoses. Shock absorbers are removed from the brackets, disconnect the ends of the rod stabilizer from the lower arms of the suspension, press out the finger joints with a puller steering drive from the holes and take steering rods in the side.
To compress the suspension spring special tools are used. Installation of units and parts of the front suspension is performed in reverse order of removal. In this case, the front suspension springs are installed in the same group, for which they are marked with paint. To prevent incorrect distribution of force in the rubber-metal joints, nuts and axles leverage tighten in the following order: set the car on a flat site, the wheels point straight ahead, load the car weighing 320 kg, for which four people sit in it, and in the trunk put 40 kg of cargo.
With a torque wrench tighten the nuts fixing the axles of the upper and then lower arms and nuts fixing the axle of the lower arm to the crossbar. After that check and adjust wheel angles.
Repair of front suspension struts. If the strut (shock absorber) is leaky, there is a leak, the causes of the malfunction may be:
loose tightening of the nut of the shock absorber reservoir (retighten the nut);
Damage or wear of the rubber sleeve (gland) of the stem or the rubber ring of the reservoir (replace or repair the stem);
Damage or wear of the working surface of the stem (replace or repair the stem);
Leaky tank welds (replace or repair tank).
If the rack (shock absorber) rod has a free, effortless movement at the beginning of the compression or extension stroke, which is not eliminated by pumping, the possible causes of malfunction may be:
decreased amount of fluid in the strut (check tightness, amount of fluid, if necessary restore tightness and add fluid);
malfunction of the intake valve or bypass valve (restore valve performance, replace damaged parts: valve, throttle plate, spring, piston (compression valve body).
If the annular locking edges on the piston or compression valve body are damaged, small irregularities can be eliminated by lapping on a lapping plate.
If the strut (shock absorber) does not develop sufficient resistance during rebound stroke, possible causes of malfunction may include:
Leaky rebound valve as a result of clogged or damaged parts (disassemble the valve, wash it, replace the damaged parts, filter or replace the fluid);
reduced rebound valve spring force (replace the spring or adjust the valve, increase the number of discs in the shock absorber);
malfunction of the bypass valve (restore the functionality of the bypass valve, replace the damaged parts: valve, throttle plate, piston, spring);
wear and tear of parts, which causes increased fluid overflow in the gaps or deep risks of the worn piston and its ring, cylinder, rod and guide (replace worn parts, replace the rod with a new one or repair).
If the strut (shock absorber) does not develop sufficient resistance during compression stroke, the possible causes of malfunction may be:
leaking compression valve due to clogging (flush the valve, filter or replace the fluid);
Worn working surface (replace worn surfaces);
Wear, deformation or damage of the compression valve or intake valve parts (replace the rack compression valve completely or just the compression valve seat; replace the rack intake valve parts; small roughness of annular edges on the rack compression valve body, if the seat is pressed out, remove by lapping on the plate or replace the body; disassemble the shock absorber compression valve and replace worn or destroyed, damaged parts).
If the strut (shock absorber) develops high resistance at the end of the compression stroke, the possible cause of failure may be an excessive amount of fluid in the shock absorber strut. Excess fluid should be removed. When there is a knocking noise in the strut (shock absorber) when the piston rod moves suddenly, the possible cause is a loose reservoir nut or piston fixing. Retighten reservoir nut or piston nut. If the amount of shock absorber fluid is insufficient, check the volume of fluid and bring it to normal.
If in the rack (shock absorber) there is a sticking when moving the rod, the possible causes may be bends of the rod, damage to the operating cylinder (replace the rod, as well as replace the cylinder).
Repair of rear suspension. If there is noise and knocking in the rear suspension while the car is moving, possible causes of the malfunction may be:
Shock absorbers malfunction (replace or repair shock absorbers);
loose mounting of shock absorbers, wear of bushing of shock absorber lugs and rubber pads (tighten bolts and nuts of shock absorber mounting, replace worn or damaged parts);
wear of silent blocks of suspension arms or cross-bar (replace silent blocks); settlement or breakage of spring (replace spring);
knocking from suspension “breakdown” due to destruction of compression stroke buffer or shock absorbers failure (replace or repair damaged buffers, replace shock absorbers); failure of hub bearing (replace bearing).
When the vehicle is drifting away from straight ahead, possible causes of the malfunction may include:
settlement or breakage of one of the suspension springs (replace the spring);
bending of the arms or cross-bar (straighten the arms or replace the beam, straighten or replace the cross-bar)
Wear on the arm or cross rod silent blocks (replace worn parts).