BMR Suspension AA020 - Manual

1
BMR F-BODY A-ARM INSTALLATION
Part #’s AA001, AA002, AA004, AA020
Tools Required:
Wrenches and sockets – 12mm, 13mm, 15mm, 18mm, 21mm
Hydraulic jack and stands
Grease gun
Needle nose pliers
1. Raise vehicle and support with stands. Remove both front wheels/tires.
2. Using a 12mm socket, remove the two caliper retaining bolts and slide the caliper out of the way.
There is no need to remove the brake line from the caliper.
3. Unplug the ABS sensor from the back of the hub. Remove the plastic wire retaining clips from the
lower A-arm and move the ABS wire out of the way.
4. Using a 13mm wrench and a 15mm socket, remove both bolts/nuts on the lower shock mount.
5. Using needle nose pliers, remove the cotter pins from both the upper and lower ball joints. Remove the
upper ball joint nut using a 15mm wrench. Using a pickle fork, knock the upper ball joint loose.
6. Loosen the lower ball joint nut using a 18mm wrench and knock the ball joint loose. Move the
spindle/rotor assembly out of the way. If you want to completely remove the spindle, loosen the tie rod
nut using a 18mm wrench and knock the tie rod loose.
7. Locate the shock mounting bolts in the engine bay. The rear two are bolts while the front two are
studs. Remove the front two nuts using a 15mm wrench and the rear bolts using a 13mm wrench. Pull
the upper A-arm and the shock/spring assembly out of the wheel well.
8. Using a 15mm and a 18mm wrench, loosen the bolts that hold the upper A-arm into the factory-
mounting bracket. Remove the factory A-arm.
9. Install the new upper ball joints supplied with the A-arms. If using BMR adjustable upper A-arms, it is
possible to correct caster problems by threading the rod-ends in or out depending on your needs. If
camber correction is required, it is recommended to perform this installation on an alignment rack and
adjust as necessary. If additional camber correction is not needed, adjust the rod ends to the OE length
and tighten the jam-nuts.
10. One the ball joints have been installed, grease the polyurethane bushings and then bolt the BMR A-arm
into the bracket using the existing mounting hardware. When installing the A-arms, the curved section
of the A-arm goes towards the front of the car with the ball joint mounting plate at an upward angle.
11. If you are only changing the upper A-arms, repeat steps 1-9 for the other side and then reinstall
components. To replace the lower A-arms, proceed to step 12.
12. Locate the lower A-arm mounting bolts. The location of these bolts in the K-member dictates the
alignment settings. Mark the position of the bolts and then loosen them using a 21mm wrench. Remove
the A-arm.
13. The BMR lower A-arms utilize an adjustable spherical bearing (rod end) on the rear mount. While
holding the BMR A-arm over the factory A-arm, turn the spherical bearing to adjust it to the
approximate length of the factory A-arm bushing. Ensure that it is horizontal in relation to the A-arm
and tighten the jam-nut. NOTE: Failure to position the spherical bearing horizontally can result in
breakage due to limited articulation and binding.
14. Position the rod-end spacers into the rod-end and grease the A-arm bushings. Note: When using a BMR
K-member, it may also be necessary to use washers in conjunction with the rear spacers in order to
shim excessive clearance in the mount.
15. Set the A-arm position to your previous marks and tighten the bolts. Lift the A-arm up and down to
ensure that it has full range of motion without any binding. Make sure that the rear rod-end is
horizontal in the mount.
16. Re-install the upper A-arm and shock/spring assembly into the upper shock tower.
17. Using the supplied 3/8” bolts, nuts, and washers, bolt the lower shock mounts to the lower A-arm.