Note. The procedure is equally applicable to both front and rear disc brakes.
Status check
1. Loosen the wheel nuts, jack up the vehicle and place it on jack stands. Remove the relevant wheel, then screw a pair of wheel nuts back onto the mounting studs with 3mm washers underneath to secure the brake disc. When checking the rear brake disc, be sure to release the parking brake.
2. Remove the brake caliper (see Section Removal and installation of brake calipers) and tie it aside with a wire to the suspension element without disconnecting the brake hose.
3. Make a visual check of the condition of both working surfaces of the disc. Light defects can be removed with fine-grained sandpaper. To remove grooves deeper than 1.0 mm, the disc should be removed and machined. Remember that the disc must be inspected from both sides.
4. If pedal pulsations are noticed during braking, the magnitude of the lateral runout of the brake disc should be assessed. Attach plunger type dial gauge (DTI) at a distance of about 12.7 mm from the outer edge of the disk. Zero the instrument and start spinning the dial. The measurement result should not go beyond the allowable range specified in the Specifications, otherwise the disk must be given to the groove.
Note. The compilers of this Guide recommend turning the discs, regardless of their condition, in order to remove all kinds of defects from the working surfaces. In extreme cases, you can limit yourself to processing the disk with fine-grained sandpaper.
5. When turning a disc, special attention should be paid to compliance with the requirements of the Specifications for its minimum allowable thickness. The corresponding marking is provided on the end surface of the disk. The disc thickness is measured with a micrometer.
Removing
1. Turn out two fixing bolts and remove an anchor bracket of the brake mechanism.
2. Give the wheel nuts screwed on for fixing of a disk, and remove assembly of the last from a wheel nave. If the disk "stuck" and cannot be removed, screw a pair of long bolts of the appropriate size into the holes threaded between the wheel studs and try to move the assembly by gradually tightening them.
Installation
1. Gently slide the disc onto the hub (take care not to damage the wheel studs).
2. Put the anchor bracket of the brake mechanism in its regular place. Tighten the bracket mounting bolts to the required torque. Install the brake pads.
3. Establish a support and tighten with the demanded effort bolts of its fastening.
4. Replace the wheel, lower the vehicle to the ground and tighten the wheel nuts to the required torque (see Specifications to Chapter Settings and ongoing maintenance). Depress the brake pedal/cock the parking brake lever several times to seat the pads on the disc. If the brake hoses have not been disconnected, there is no need to bleed the hydraulic system. Before starting the operation of the vehicle, make sure that the brakes are working properly.