Grinding (turning) a brake disc, in situ
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Grinding (turning) a brake disc, in situ
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Lathe “VBG 600” and the SAAB/GM 108/4--110/5 connecting plate were used in the development of this method.
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1.
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Raise the car and remove the wheels on both sides.
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Important
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It is important to remove both wheels so that vibration will be eliminated and also to raise the car horizontally so that lubrication of the transmission will take place correctly.
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2.
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If the work is carried out in the order front right, front left, rear left, rear right, then basic adjustment of the lathe will be facilitated.
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3.
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Remove the brake caliper without loosening the brake line and suspend the caliper with a strap, see Adjustment/replacement, “Hydraulic body, front wheel, changing” and Adjustment/replacement, “Fixed brake caliper, rear wheel changing”.
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4.
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Check the brake disc dimensions, see
and
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5.
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Clean the mating surface between the brake disc and the connecting plate.
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6.
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Fit the tool for runout compensation (accessory 25) in the brake caliper bracket.
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7.
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Fit the connecting plate with the wheel studs.
Tightening torque: 30 Nm (22 lbf ft).
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8.
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Back off the adjusting screws.
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9.
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Clean the connecting surface and fit the lathe to the connecting plate, connect the lathe.
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10.
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Connect the arm with the dial gauge resting against the runout compensation tool.
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11.
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Start the lathe and note the highest and lowest readings. Switch off the lathe.
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12.
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Adjust one of the four adjusting screws and repeat points 9 and 10 until the variation is less than 0.08 mm (0.003 in).
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13.
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Remove the arm with dial gauge and the runout compensation tool.
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14.
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Adjust the turning tools against the disc with the tool holder. Remove the locking screw and move the holder.
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15.
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Set the automatic stop.
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16.
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Feed out the tool holder and manually grind off the outer and inner rusty edges.
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17.
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Set the turning depth and switch on automatic operation.
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18.
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Check the brake disc.
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19.
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Remove the lathe. Remove the connecting plate.
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20.
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Fit the brake caliper, see
and
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21.
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To grind (turn) the other side, the lathe will have to be turned upside down.
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22.
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Grinding (turning) is then carried out as described above.
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