Suspension bump stop and dust cover, SET OF 4. Porsche 986 / 987 / 987C / 996  ❭  99634330102

Shock absorber additional spring. FRONT
Front shock absorber bump stop and dust cover kit by OE Match for Porsche 986 Boxster, 987 Boxster, 987C Cayman and 996 models. This SET OF 4 contains the components required to service both front suspension struts.
SET OF 4


Porsche 996 C2 / C4 / C4S 1998 - 2005
Porsche 996 Turbo 2001 - 2005
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987.2 Boxster 2009 - 2012
Porsche 987C.1 Cayman 2005 - 2008
Porsche 987C.2 Cayman 2009 - 2012

Diagram ref no.: 8 and 9

What This Product Does

The additional springs, commonly described as bump stops, provide progressive cushioning as the suspension approaches the end of its compression travel. The bellows cover the exposed shock absorber piston rods, helping to limit contact with road dirt and other contamination. Together, these parts support correct shock absorber operation and are suitable for installation during front suspension servicing.

Functions

• Cushions the final stage of front suspension compression
• Helps prevent harsh metal-to-metal bottoming
• Protects the shock absorber piston rod from road contamination
• Supports controlled movement of the front strut assembly
• Replaces deteriorated, split or compressed original components
• Allows both front suspension struts to be serviced together

Technical Details

• Position: Front axle
• Quantity: SET OF 4
• Contents: two additional springs and two shock absorber bellows
• Additional spring reference: 99634330102
• Bellows reference: 99634350500
• Exploded diagram reference numbers: 8 and 9

Symptoms of Fault

• Harsh impacts when the suspension is heavily compressed
• Knocking or increased noise over uneven surfaces
• Split, crumbling or permanently compressed bump stops
• Torn or detached shock absorber dust covers
• Visible dirt or contamination around the shock absorber piston rod
• Poorly controlled suspension travel when encountering larger bumps

Why Replacement Matters

Bump stops and bellows deteriorate through age, repeated compression, heat, moisture and road contamination. Worn components can reduce protection for the shock absorber and allow harsher suspension compression. Replacing them while the front struts are dismantled avoids reusing perished parts and can reduce the need to repeat the same labour later. OE Match components are intended as OE-equivalent replacements for routine suspension maintenance.

OE Reference

• 99634330102 — shock absorber additional spring
• 99634350500 — shock absorber bellows

FAQs

• Does this kit service both front struts?
  Yes. The SET OF 4 contains two additional springs and two bellows for the left and right front shock absorber assemblies.
• Should these parts be renewed with new shock absorbers?
  Replacement is advisable when the existing parts are split, compressed, damaged or perished, particularly while the struts are already dismantled.
• Is wheel alignment required afterwards?
  An alignment check is generally recommended following significant suspension work or if the vehicle shows uneven tyre wear or altered steering behaviour.