11.5. Check of a state, removal and installation of a brake disk

The procedure is equally applicable to disk brake mechanisms of both forward, and back wheels.

Check of a state

 PERFORMANCE ORDER

1. Weaken fastening nuts to Coca, a poddomkratta the car and establish it on props. Remove the corresponding wheel, then screw couple of nuts back on fixing hairpins, having enclosed under them washers 3 mm thick for the purpose of fixing of a brake disk (if two screws of fastening of a disk are not turned out yet, need for a navorachivaniye of nuts disappears). When checking a disk of the back brake mechanism do not forget to release the parking brake.
2. Remove a brake support (see Removal, repair and installation of supports of disk brake mechanisms) and tie up it aside a wire to a suspension bracket element, without disconnecting a brake hose.

3. Make visual check of a condition of a working surface of a disk (see an accompanying illustration). Easy defects can be eliminated by means of a fine-grained emery paper. For removal of furrows more than 0.38 mm in depth the disk should be subjected to a pro-point.

4a. If during braking pedal pulsations were noticed, it is necessary to estimate the size of a side beating of a brake disk. Fix the dial measuring instrument of plunger type (DTI) at distance about 12.7 mm from the outer edge of a disk (see an accompanying illustration).

4b. Nullify the device and begin to rotate a disk. The result of measurement should not exceed the limit of the admissible range stipulated in Specifications, otherwise the disk needs to be given to a pro-point.


Authors of the present manual recommend to make a pro-point of disks regardless of their state for the purpose of removal from any working surfaces of defects. As a last resort it is possible to be limited to processing of a disk a fine-grained emery paper.


5a. At a pro-point of a disk it is necessary to pay special attention to observance of requirements of Specifications to its minimum admissible thickness. On a face surface of a disk the corresponding marking is provided (see an accompanying illustration).

5b. Measurement of thickness of a disk is performed by means of a micrometer (see an accompanying illustration).

Removal

 PERFORMANCE ORDER

1a. Turn out two bolts of fastening of an anchor bracket of a support to a rotary fist (see an accompanying illustration).

1b. Or (on the brake mechanism of a back wheel) bolts of fastening of a bracket to the longitudinal lever of a suspension bracket. Remove a bracket.

2a. Remove two wheel nuts used for fixing of a disk on a nave / turn out two fixing screws (see an accompanying illustration).

2b. Remove a disk from a wheel nave. If the disk "stuck" to a nave, it can be squeezed out by a vvorachivaniye in fixing openings of couple of bolts of the suitable size (see an accompanying illustration).

2c. Tighten bolts evenly and gradually until the disk completely is not released. At removal of a disk try not to damage a carving of hairpins of fastening of a wheel (see an accompanying illustration).

Installation

 PERFORMANCE ORDER

1. Accurately put on a disk a nave (again try not to damage wheel hairpins). Screw fixing screws.
2. Install an anchor bracket of a support on a drive. Tighten bolts of fastening of a bracket and a support with the required effort.
3. Establish into place a wheel, lower the car on the earth and tighten wheel nuts with the required effort (see Specifications to the Head Routine maintenance). Several times squeeze out a brake pedal / cock the lever of the parking brake for the purpose of shrinkage of blocks on a disk. If brake hoses were not disconnected, need for a prokachivaniye of hydraulic system is absent. Before starting operation of the car, make sure of serviceability of functioning of brakes.