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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)
Rear shocks would be in the boot or back seat - just unbolt and replace, you will have to remove both wheels. Front shocks may need a spring compressor if the shocks are inside the road spring, DO NOT ATTEMPT FRONT SHOCKS WITHOUT A SPRING COMPRESSOR YOU WILL GET SERIOUSLY HURT!!!
Support the rear suspensionfrom under the lower suspension arm.
Remove shock absorber upper nut, washer and bushing
Remove lower shock absorber nut and washer.
Remove shock absorber.
Reverse steps to install.
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.
The shocks are electronic and very expensive. Changed mine last year, the fronts were $87.00 each and thr rear $125.00 each. They could only be purchased from the dealer. Haven't seen any online. They have a connection at the top that monitors the pressure or something.