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E4-WM5-Y631A00
MOUNTING INSTRUCTION
This instruction is for both left front (driver) 25-287806 and right front (passenger) 25-287813
B8 8100 shocks. A bill of materials (BOM) of the included mounting parts kits is shown on the
next page.
Installation of shock absorbers requires special tools and expert knowledge. Accordingly, installation of all BILSTEIN
products must be performed by a qualified suspension specialist.
When replacing other brands, BILSTEIN shock absorbers should always be installed as a set. All BILSTEIN products
must only be used for the specific, intended application as indicated in the application guide. Any use of any BILSTEIN
product other than for its intended use may result in serious bodily injury or death.
Always use a chassis hoist for the installation of BILSTEIN products and make certain that the raised vehicle is securely
attached to the hoist and/or supported to prevent the vehicle from slipping, falling, or moving during the installation
process.
If you choose to install any BILSTEIN product without the necessary special tools, expertise or chassis hoist, you
may subject yourself to the risk of serious bodily injury or death. If you elect not to use a chassis hoist, at least make
sure the vehicle is on level ground, that all tires on the ground during installation are blocked to prevent movement, that at least
two tires are on the ground at all times, and that adequately secured safety stands (jack stands) are used to support the chassis.
NEVER get under the vehicle until you have checked to make sure all of these steps are performed.
BILSTEIN suspension products are gas-filled and are highly pressurized.
Never place any BILSTEIN product in a vise or use a clamp on any BILSTEIN product.
Never apply heat near any BILSTEIN product.
Never attempt to open or repair any BILSTEIN product, in order to prevent serious bodily injury or death.
Any attempt to misuse, misapply, modify, or tamper with any BILSTEIN suspension product voids any warranty and may result
in serious bodily injury or death.
While installing any BILSTEIN product:
Do not use impact tools for loosening or tightening fasteners, because this may destroy the screw threads.
Self-locking fasteners must only be used once!
Reuse original equipment components only if they are in good condition, otherwise replace them with new components.
Never remove the slight film of oil on the piston rod and seal.
All mounting fasteners for shocks and struts must be securely tightened before the vehicle is operated.
After installing any BILSTEIN product:
The suspension caster and camber must be checked and/or adjusted to comply with the vehicle manufacturer's
specifications.
The (load dependent) brake compensator and the anti-lock brake system must be checked and/or reset to comply with
the vehicle manufacturer's specifications.
The headlight aim must be checked and adjusted.
B8 8100 bypass shocks feature a proprietary BILSTEIN zinc plated finish. This finish must be serviced in order to
maintain its luster.
Particularly in moist climates, a protective coating, such as a wax or lubricating oil should be
periodically applied to prevent tarnishing. This finish is not covered under warranty.
It is normal to hear a slight audible clicking noise during compression and rebound strokes in the B8 8100 bypass
shocks, most notably during low velocity events. This is due to the internal check pistons opening and closing to
create the externally adjustable compression and rebound zones.
created: 12.06.19
IMPORTANT! READ THIS FIRST!
E4-WM5-Y631A00_0 Page 1 of 23
latest revision:

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Summary of Contents for Bilstein B8 8100

  • Page 1 This finish is not covered under warranty. It is normal to hear a slight audible clicking noise during compression and rebound strokes in the B8 8100 bypass shocks, most notably during low velocity events. This is due to the internal check pistons opening and closing to create the externally adjustable compression and rebound zones.
  • Page 2 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 1 – Reservoir Mount Kit for Vehicle Left Side (25-287806) created: 12.06.19 E4-WM5-Y631A00_0 Page 2 of 23 latest revision:...
  • Page 3 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 2 – Reservoir Mount Kit for Vehicle Right Side (25-287813) created: 12.06.19 E4-WM5-Y631A00_0 Page 3 of 23 latest revision:...
  • Page 4 E4-WM5-Y631A00 MOUNTING INSTRUCTION Bill of Materials Item # Description Qty. in 25-287806 Qty. in 25-287813 Reservoir Bracket Plate Reservoir Clamp; Ø60mm Flat Head Screw; M8x1.25; L=18 Flange Head Cap Screw, 1/4"-20 x 1" Flange Head Cap Screw, 5/16"-18 x 1" Threaded Insert, 1/4"-20 Internal Thread Threaded Insert, 5/16"-18, Internal, Hex Socket Head Cap Screw;...
  • Page 5 MOUNTING INSTRUCTION B8 8100 bypass shock installation procedure: B8 8100 bypass shocks are corner specific. The step by step procedure is shown with pictures of both sides. See page 22 for the end result. *Installation of B8 8100 bypass shocks requires the use of wheels with a maximum of 4.5” backspacing to ensure clearance between the tire and the shocks.*...
  • Page 6 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 4 For the left side, insert the threaded insert (BOM item #6) into the hole shown in Figure 5. For the right side, insert the threaded insert (BOM item #6) into the hole shown in Figure 6. 1/4”-20 THREADED INSERT...
  • Page 7 E4-WM5-Y631A00 MOUNTING INSTRUCTION For the left side, insert the hex threaded insert (BOM item #7) into the hole shown in Figure 5. For the right side, insert the hex threaded insert (BOM item #7) into the hole shown in Figure 6. While keeping the hex threaded insert (BOM item #7) flange firm and parallel against the bumper support, tighten the screw (BOM item #13) using a 1/2”...
  • Page 8 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figures 8 - Vehicle Right Side Assembly Left Side Reservoir Hose Mount Bracket Locate the hole in the front side of the left spring bucket shown in figure 9. Using a M8x1.25 Socket Head Cap Screw (BOM item #17), and a M8x1.25 Serrated Flange Nut (BOM item #18), attach the Left Reservoir Hose Mount Bracket (BOM item #16) to the spring bucket and orient as shown in figures 10 and 11.
  • Page 9 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 9 – Vehicle Left Side Spring Bucket Figure 10 – Vehicle Left Side Reservoir Hose Mount Bracket created: 12.06.19 E4-WM5-Y631A00_0 Page 9 of 23 latest revision:...
  • Page 10 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 11 – Vehicle Left Side Serrated Flange Nut Installed Right Side Reservoir Hose Mount Bracket Locate the hole in the front side of the right spring bucket shown in figure 12. Using a M8x1.25 Button Head Screw (BOM item #20), and a M8x1.25 Serrated Flange Nut (BOM item #18), attach the Right Reservoir Hose Mount Bracket (BOM item #22) to the spring bucket and orient as shown in figures 13 and 14.
  • Page 11 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 12 – Vehicle Right Side Spring Bucket Figure 13 – Vehicle Right Side Hose Bracket created: 12.06.19 E4-WM5-Y631A00_0 Page 11 of 23 latest revision:...
  • Page 12 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 14 – Vehicle Right Side Serrated Flange Nut Installed Shock Upper Mount Installation Install the shock’s upper mount using the supplied 30mm Spacer, and OE upper bolt/washer as shown in Figures 15 through 18. Do not tighten at this time. created: 12.06.19 E4-WM5-Y631A00_0 Page 12 of 23 latest revision:...
  • Page 13 E4-WM5-Y631A00 MOUNTING INSTRUCTION 30mm SPACER WHEEL CHASSIS CHASSIS SHOCK ABSORBER OE WASHER OE BOLT Figure 15 – Vehicle Left Side Upper Mount Assembly Diagram Figure 16 – Vehicle Left Side Upper Mount created: 12.06.19 E4-WM5-Y631A00_0 Page 13 of 23 latest revision:...
  • Page 14 E4-WM5-Y631A00 MOUNTING INSTRUCTION 30mm SPACER CHASSIS WHEEL CHASSIS SHOCK ABSORBER OE WASHER OE BOLT Figure 17 – Vehicle Right Side Upper Mount Assembly Diagram Figure 18 – Vehicle Right Side Upper Mount created: 12.06.19 E4-WM5-Y631A00_0 Page 14 of 23 latest revision:...
  • Page 15 E4-WM5-Y631A00 MOUNTING INSTRUCTION Shock Lower Mount Installation A mount kit is included to allow the lower shock mount to be offset away from the frame. This kit is depicted in Figure Figure 19 – Lower Mount Offset Bracket Install the Mount Clevis (BOM item #23) using the M10x1.5 Flat Head Screw (BOM item #26) and M10x1.5 Nut (BOM Item #28) for the left side of the vehicle.
  • Page 16 E4-WM5-Y631A00 MOUNTING INSTRUCTION Place the Spacer (BOM item #24) between the flanges of the OE mount. Positon the shock’s lower mount between the outside flange of the OE mount and the clevis. Make sure the shocks lower mount is installed angling the shock toward the back of the vehicle and inward toward the chassis as shown in Figures 20 and 21.
  • Page 17 E4-WM5-Y631A00 MOUNTING INSTRUCTION Reservoir Mounting Apply non-permanent thread locker to the 5/16”-18 X 1” Flange Head Cap Screw (BOM item #5) and install the reservoir mount assembly with the screw in the bottom threaded insert. Leave the screw loose for now. Rotate the assembly toward the rear of the vehicle and slide the reservoir into the clamp as shown in Figures 22 through 25.
  • Page 18 E4-WM5-Y631A00 MOUNTING INSTRUCTION Rotate the reservoir mount assembly back to vertical. Apply non-permanent thread locker to the 1/4”-20 x 1” Flange Head Cap Screw (BOM item #4) and install it in the upper threaded insert. Torque both screws 10 ft-lb (13.6 Nm). Position the end of the reservoir tube approximately 40mm below the bottom side of the clamp as shown in Figure 26.
  • Page 19 E4-WM5-Y631A00 MOUNTING INSTRUCTION Apply Rubber Protective Strip To protect the reservoir hose from abrading on the chassis, a rubber strip (BOM item #21) should be applied to the chassis body mount in the locations shown in Figure 27 on the left side of the vehicle and 28 on the right side of the vehicle.
  • Page 20 E4-WM5-Y631A00 MOUNTING INSTRUCTION Figure 29 – Left Reservoir Hose Installed Figure 30 – Left Reservoir Hose Installed (Side View) Right Side Reservoir Hose Mounting Spread the Loop Clamp (BOM item #19) enough to wrap it around the right side reservoir hose. Apply non- permanent thread locker to the M8x1.25 Button head Screw (BOM item #20), and using a M8x1.25 Serrated Flange Nut (BOM item #18), secure the Loop Clamp (BOM item #19) to the Reservoir Hose Mount Bracket (BOM item #22)
  • Page 21 E4-WM5-Y631A00 MOUNTING INSTRUCTION Loosen the Socket Head Cap Screw in the Reservoir Clamp, and angle the reservoir hose toward the inside of the vehicle. Adjust the reservoir angle so that the reservoir hose is 6mm from the chassis body mount as shown in Figures 32 and 33.
  • Page 22 E4-WM5-Y631A00 MOUNTING INSTRUCTION Left Side Installed (Without Inner Fender Liner) Right Side Installed (Without Fender Liner) created: 12.06.19 E4-WM5-Y631A00_0 Page 22 of 23 latest revision:...
  • Page 23 MOUNTING INSTRUCTION B8 8100 bypass shocks allow the user to tune the damping for the best possible ride quality of their vehicle. The shocks offer multiple zones of compression and rebound damping, depending upon the bypass configuration. The factory setting Rebound –...