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Home >> Saab >> 2010 >> 9-3X Automatic >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System - FOOTBRAKE System >> Repair Instructions >> Checking for lateral run-out and variation in thickness, rear wheels

Checking for lateral run-out and variation in thickness, rear wheels

  1. Raise the car and remove the rear wheels.
  2. Start by control measuring on one side.
  3. Remove the retaining spring from the brake caliper.
    Fig 1: Illustration For Steps 3-4
    G05061390Courtesy of SAAB-SCANIA OF AMERICA, INC.
  4. Remove the protective covers.

    Remove the hydraulic body and suspend it with a hook on the brake pipe holder.

    NOTE: Be careful not to damage the brake pipe.
  5. Remove the outer brake pad.
    Fig 2: Illustration For Steps 4 And 6
    G05061391Courtesy of SAAB-SCANIA OF AMERICA, INC.
  6. Remove the brake caliper carrier.
  7. Fit the five wheel bolts with one washer, part no. 80 73 124, on each.
    Fig 3: Identifying Wheel Bolts And (78 40 622) Dial Gauge
    G05061392Courtesy of SAAB-SCANIA OF AMERICA, INC.
  8. Mount the brake disc on the lower retaining lug for the brake caliper with an M10 bolt and nut. Fit a 78 40 622 DIAL GAUGE  on each side.
  9. Rotate the brake disc while observing the outboard dial gauge. Zero both gauges when the negative reading obtained on the outboard one is at maximum.
    Fig 4: Identifying Dial Gauge On Brake Disc
    G05061393Courtesy of SAAB-SCANIA OF AMERICA, INC.
  10. Rotate the disc and read the gauges. Note the runout (A) and variation in thickness (B).
  11. Check that the readings are within specified intervals, see Brakes - Footbrake system - Technical data - BRAKE DISCS - REAR .
  12. Remove the dial gauges, brake disc measuring tool and wheel studs with washers.
  13. If the measured runout and thickness variations are outside the tolerances, see Brakes - Footbrake system - Technical data - BRAKE DISCS - REAR , then the discs must be turned or replaced, see BRAKE DISC, REAR  and BRAKE DISC, REAR, 4WD 
  14. Clean the contact surfaces between the brake caliper carrier and the steering swivel member.

    Fit the brake caliper carrier with 74 96 268 Thread locking adhesive.

    Tightening torque 130 Nm +45° (96 lbf ft +45°) 

    Fig 5: Identifying Brake Caliper Carrier Bolts
    G05061394Courtesy of SAAB-SCANIA OF AMERICA, INC.
  15. Remove the inner brake pad and screw in the brake piston using 89 96 969 RESETTING TOOL  and 89 96 977 ADAPTER 
    Fig 6: Illustration For Steps 15-16
    G05061395Courtesy of SAAB-SCANIA OF AMERICA, INC.
  16. Fit the brake pads.
  17. Fit the hydraulic body.

    Tightening torque 28 Nm (21 lbf ft) 

    Fit the protective covers.

    Fig 7: Illustration For Steps 17-18
    G05564147Courtesy of SAAB-SCANIA OF AMERICA, INC.
  18. Fit the retaining spring to the brake caliper.
  19. Fit the wheel
  20. Repeat this method of measurement on the other brake disc.
  21. Lower the car and depress the brake pedal to press out the brake pads.
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