Brake caliper seal repair kit, Rear. Porsche 911 1984-89  ❭  91135290500

Brake caliper seal repair kit.
This OE Match-standard brake caliper seal repair kit is engineered as a direct-fit replacement for the rear brake caliper sealing components on classic Porsche 911 models. This kit supplies the essential gaskets, seals and dust boots needed to rebuild the brake caliper’s sealing surfaces accurately.
Sold per caliper.


Porsche 911 1984-89 (Rear)

This kit is sold on a per-caliper basis - for reconstructing or refreshing one rear brake caliper’s internal seals and dust protection.

In a brake caliper, seals and dust boots play a critical role in maintaining hydraulic integrity and protecting internal components from dirt and moisture. Over time seals can harden, crack or shrink, leading to fluid leaks, reduced braking performance, and uneven pad wear. This kit provides the correct rubber components to refresh the caliper sealing surfaces, allowing pistons to move freely while maintaining fluid pressure and protecting against contamination.

Function
• Hydraulic Seal Function: Prevents brake fluid leakage from the caliper piston bore under pressure.
• Dust Protection: Dust covers keep contaminants out of the caliper internals, reducing corrosion and wear.
• Restore Performance: Helps return caliper piston travel and braking response to as-designed levels.
• Durability: rubber materials resist heat, fluid exposure and aging typical of high-stress brake system environments.

Brake caliper seals and dust boots wear with age and use. When the seals degrade, brake fluid can leak at the caliper piston, reducing hydraulic pressure, degrading braking performance, and potentially causing uneven pad wear or pulling under braking. Dust boots that are cracked or missing allow grit and moisture into the caliper bore, accelerating corrosion and piston binding. Replacing these with an OE Match kit helps restore correct brake function, maintain consistent pedal feel, and extend the life of your brake calipers.

Replace the brake caliper seal kit if you notice:
•  Brake fluid leaks around the caliper piston seal.
•  Spongy or inconsistent brake pedal feel.
•  Uneven pad wear or reduced braking performance.
•  Cracked, hardened or missing dust covers.
•  During a full brake overhaul or rebuild.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

91135290500

The product you are viewing cross references to these numbers