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Home >> Saab >> 2003 >> 9-3 Vector, Standard >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Hydraulic Brake System - FOOTBRAKE System (Late; 9440) >> Adjustment - Replacement >> 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 Step 3-4
    G03619358Courtesy 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 Step 4, 6
    G03619359Courtesy 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: Illustration For Step 7-8
    G03619360Courtesy 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: Rotating Brake Disc While Observing Outboard Dial Gauge
    G03619361Courtesy 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 the tolerance limits.
  12. Remove the dial gauges, brake disc measuring tool and wheel studs with washers.
  13. If runout and thickness variation exceeds specified tolerances, the discs must be machined or replaced.
  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: Illustration For Step 14
    G03619362Courtesy 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 Step 15-16
    G03619363Courtesy of SAAB-SCANIA OF AMERICA, INC.
  16. Fit the brake pads.
    NOTE: Make sure the springs on the inner pad enter the groove in the piston.
  17. Fit the hydraulic body.

    Tightening torque 28 Nm (21 lbf ft) 

    Fit the protective covers.

    Fig 7: Illustration For Step 17-18
    G03619364Courtesy 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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