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brake system
| Fig. 15.70. Elements of the anti-lock braking system: 1 - hydraulic device; 2 - a rotor speed sensor of the front wheels; 3 - the gauge of frequency of rotation of the front wheel; 4 - diagnostic connector; 5 - the gauge of frequency of rotation of the rear wheel; 6 - a rotor speed sensor of the rear wheel; 7 - the control unit; 8 - the relay unit
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Some cars equipped with a 1987 release disc brakes rear wheels of the car on the 1988 release additionally installed anti-lock brakes (ABS). Antilock braking system, installed in 1988, is designed to improve the stability of the car when braking. This is achieved by monitoring the speed of each wheel and the brake pressure control system which prevents the wheels from locking. The presence of a system fault signal yellow warning lamp in the instrument cluster. Anti-lock braking system consists of a hydraulic unit, relay unit, control unit and wheel speed sensors (Fig. 15.70). The control unit is located in the cabin and is essentially a "brain" of the system, allowing the reception and processing of signals from wheel speed sensors and generating control commands relay unit and hydraulic unit. Due to the complexity of the device diagnostics and repair of the system it is advisable to carry out in service of car-care center. When working near the wheels, brakes or suspension of the car, be careful not to damage the wheel speed sensor.
Rear disc brakes The design of the brake pads and cylinders, as well as their validation are basically the same as for the front disc brakes. For cars 1987 release with rear disc brakes apply the order of adjustment of wheel bearing grease and replace hub described for drum brakes. On cars of 1988 and later years of release rear wheel bearings are not collapsible, they are not required. As for the complete dismantling of the caliper rear brake requires special tools, this work should be carried out at the service center. Replacing the brake pads Lift the car, fix on supports and remove the rear wheel. Disconnect the parking brake cable from the bracket and arm support.
| Fig. 15.73. Rear disc brakes of cars of release in 1987: 1 - the parking brake cable; 2 - a brake hose; 3 - support from a brake cylinder and the brake pads; 4 - fingers brake pads and plug; 5 - the hub cap; 6 - a nut; 7 - the bearing; 8 - Disc; 9 - arm caliper; 10 - guard rear brake
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In cars 1987 release, remove the guide pins and remove the brake cylinder (Fig. 15.73). Remove the brake pads by prying with a screwdriver.
| Fig. 15.71. Rear disc brakes of cars of release in 1988: 1 - the brake disc; 2 - pressing bracket; 3 - a support bracket; 4 - V-shaped spring; 5 - brake pads and soundproof lining; 6 - a support bracket; 7 - the parking brake cable; 8 - brake hose
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On vehicles with a 1988 release, unscrew the upper bolt on the caliper and turn the axle, pushing it down to allow access to the blocks (Fig. 15.71). Remove the V-shaped spring pads, gaskets and soundproof guide bracket. The further procedure corresponds to the replacement given in Sec. 10 "Brake System". Inspect the brake disc and replace it with a heavy damage. For vehicles with ABS, replace the wheel speed sensor located on the disk. For all models Round turn clockwise pistons and push them into the cylinder. It is necessary to install new brake pad thickness greater than worn. In cars 1987 release, set the new caliper pads. Install the caliper guide pins and tighten to torque. For vehicles from 1988 model year set gaskets, clamps and pressure pads, turn the support, by setting it in place, and tighten the bolt torque. Repeat the operation for the other rear brake.
A WARNING Before the trip several times, press the brake pedal to press the pads to the brake disc. Check the brake fluid level and if necessary restore it. Make sure of reliability of the brakes before leaving the roadway, do a few test braking, moving at low speed. |
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