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check the vans rear shock absorbers if they are faulty the car can exhibit this type of behaviour and braking will be less efficient. Also tyre wear will be affected to.
I am not a shock absorber expert but had recently my four shock absorbers replaced as the fluid had ruptured in the front shockers and the rear mounts for the rear shockers were corroded and unsafe. (shock absorber expert at repair place mentioned the symptoms you are describing as a rear shock problem or the rear leaf springs are faulty)
Support the rear axle and slightly lower the vehicle enough to lessen tension on the shock absorber.
Remove the lower shock absorber retaining nut and washer.
Disconnect the lower end of the shock absorber from the mounting stud.
Remove the shock absorber upper end retaining nut and washer.
Remove the shock absorber from the vehicle.
Install the shock absorber onto the upper and lower mounting studs of the vehicle.
Install the washers and retaining nuts. Tighten the upper and lower retaining nuts to 22-30 ft. lbs. (30-41 Nm) on 2001-02 models or 22 ft. lbs. (30 Nm) for the upper bolts and 47 ft. lbs. (64 Nm) on the lower bolts.
On 4-door sedan, remove the package tray and vent duct.
On hatchback, remove the speaker grilles.
Disconnect the brake line from the wheel cylinder.
CAUTION Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with the eyes and wash your hands thoroughly after handling brake fluid. If you do get brake fluid in your eyes, flush your eyes with clean, running water for 15 minutes. If eye irritation persists, or if you have taken brake fluid internally, IMMEDIATELY seek medical assistance.
Remove the brake line from the brake hose.
Disconnect the brake hose from its bracket on the shock absorber.
Loosen, but do not remove, the nut holding the suspension support to the shock absorber.
Unbolt the shock absorber from the rear arm.
Unbolt and extract the shock absorber from the body.
Attach the shock absorber to the body and tighten the 3 nuts to 17 ft. lbs. (25 Nm).
Engage the shock absorber bracket with the carrier and install the hardware. Tighten the nuts to 119 ft. lbs. (162 Nm).
Tighten the center suspension support nut to 36 ft. lbs. (49 Nm). There is a bearing located under the suspension support dust cover. Remove the dust cover and pack the bearing with multi-purpose grease. Once packed, reinstall the dust cover.
The remainder of installation is the reverse of removal. Tighten each component to specifications.
On the 4-door sedan, remove the package tray and vent duct. On 1992-96 models, it will be necessary to remove the rear seat back.
On the hatchback, remove the speaker grilles.
On the wagon models remove the tonnue cover and rear seat back.
Loosen the rear wheel lug nuts, raise the rear of the vehicle and support it safely. Block the front wheels.
Remove the rear wheels.
Disconnect the brake hose and the ABS speed sensor from the shock absorber.
If equipped with ABS, disconnect the Load Sensing Proportioning Valve (LSPV) spring from the lower arm.
Disconnect the stabilizer bar link from the shock absorber.
Support the rear axle and loosen the 2 bolts from the lower end of the shock absorber.
From inside the vehicle, unbolt the upper support.
Fig. 1: A rubber cap covers the rear shock absorber tower nut
Fig. 2: The upper shock absorber tower is retained by the center nut (circled) and three surrounding nuts
Lower the rear axle carrier and remove the two bolts.
Remove the shock absorber from the vehicle.
Install the shock absorber assembly onto the vehicle.
Connect the brake hose and the ABS speed sensor to the shock absorber.
Connect the stabilizer bar link to the shock absorber.
Install the wheel and tire assembly.
During installation, please observe the following tighten specifications:
Tighten the shock absorber-to-body bolts to 29 ft. lbs. (39 Nm).
Tighten the shock absorber-to-axle carrier nuts to 166 ft. lbs. (226 Nm) on 1988-91 vehicles and 188 ft. lbs. (255 Nm) on 1992-96 vehicles.
Tighten the suspension support-to-shock absorber nut to 36 ft. lbs. (49 Nm) on 1988-91 vehicles. On 1992-96 models, tighten the stabilizer bar link to shock absorber retainers to 47 ft. lbs. (64 Nm).
Install the rear seat back, vent duct and the package tray as required.
Answer REMOVAL - SHOCK ASSEMBLY NOTE: Access for the nuts attaching the rear shock assembly upper mount to the vehicle is through the inside of the trunk.
Roll back carpeting on top of the rear shock tower to access shock mounting nuts. Remove plastic cover from the top of the shock assembly. Remove 2 nuts attaching the shock assembly upper mount/spring seat to the shock tower. Raise vehicle on jackstands or centered on a frame contact type hoist. (Refer to LUBRICATION & MAINTENANCE/HOISTING - STANDARD PROCEDURE) Remove the rear wheel and tire assembly from the vehicle. Remove two fasteners holding the splash shield to the shock assembly upper mount. Remove bolt attaching shock absorber to rear knuckle (Shock Absorber Attachment To Knuckle). Remove the shock absorber from the rear knuckle first when removing the shock absorber from vehicle by pushing down on the rear suspension. Move shock assembly downward and tilt top of shock outward, then remove shock assembly from vehicle through top of wheel opening
Fig. Use support bracket tool J-23028-01 mounted on a jack to support the rear lower control arm
Remove or disconnect the following:
Electronic Ride Control (ELC) air tube from the shockTwo bolts securing the shock to the control armTrunk trim to gain access to the shock upper mounting nuts.Cover, the two nuts, and the reinforcement from the top of the shockShock from the vehicle
Fig. Remove the cover to gain access to the upper shock absorber mounting components-rear suspension
Fig. Exploded view of the lower shock absorber mounting to the knuckle assembly-rear suspension
To install: Install or connect the following:
Shock, reinforcement, and the two nuts. Tighten the mounting nuts to 15 ft. lbs. (20 Nm).Shock coverTrunk trimShock-to-control arm bolts and tighten the bolts to 18 ft. lbs. (24 Nm)ELC air tube to the shock.Tire and wheel assembly
with great difficulty,three bolts hold the plate that takes the top bush/mounting .jack vehicle up and support with axle stand .Another jack under rear axle ,jack this one up till cars starts to lift then fit the spring clamps and compress the spring.Next undo the 3/4 13mm headed bolts that hold the plate to the chassis ,if you can release them???---??? ,then next using a small bottle jack take the strain on the bottom of the shock absorber and then remove the bolt ,lower the jack and the top one will lower as well ,undo the two nuts on the top mounting and pull the old shock absorber out .Or what i do if back is dancing and thats to do as above to support vehicle ,support lower of shock absorber ,remove the bolt and then jack it up ,then drill a small hole about an inch from the top of the tube and then thread it ,refill the shock absorber with a heavier oil like dextron .fit a bolt into the hole with a rubber washer and its as good as new
This is a dangerous job if you do not have the proper equipment for compressing the spring that is around the rear shock. I do not recomend performing this job without the proper equipment. Unloading the spring without it compressed can cuase injury.
If you have the proper equipment this is how you do it.
REMOVAL - SHOCK ASSEMBLY
NOTE:Access for the nuts attaching the rear shock assembly upper mount to the vehicle is through the inside of the trunk.
Roll back carpeting on top of the rear shock tower to access shock mounting nuts.
Remove plastic cover from the top of the shock assembly.
Remove 2 nuts attaching the shock assembly upper mount/spring seat to the shock tower.
Raise vehicle on jackstands or centered on a frame contact type hoist.
Remove the rear wheel and tire assembly from the vehicle.
Remove two fasteners holding the splash shield to the shock assembly upper mount.
Remove bolt attaching shock absorber to rear knuckle
Remove the shock absorber from the rear knuckle first when removing the shock absorber from vehicle by pushing down on the rear suspension.
Move shock assembly downward and tilt top of shock outward, then remove shock assembly from vehicle through top of wheel opening.