Handbrake shoes expanding bows, SET OF 4. Porsche 911 1970-89  ❭  91135209001

Handbrake shoes expanding bow set.
OE Match set of four handbrake shoe expanding bows (also called parking brake shoe expanders/spreaders) designed to restore correct mechanical expansion and release of the handbrake shoes inside the rear disc “drum-in-hat” parking brake system.
SET OF 4

Fits:
Porsche 911 1970 - 1989
Porsche 911 Turbo 1975 - 1977

Diagram ref no. 24

The expanding bow is a key handbrake hardware component that sits between the parking brake shoes and helps spread them evenly against the drum surface when the handbrake is applied. This OE Match version is made to match the original part’s fit and geometry for reliable installation and operation.

When you pull the handbrake lever, the mechanism forces the expanding bow to push the shoes outward. Correct expansion improves holding force and helps the shoes release cleanly when the handbrake is dropped - reducing drag, heat build-up, and uneven wear.

Function:
•  Transfers handbrake actuation force into even shoe expansion
•  Helps maintain consistent contact and predictable holding power
•  Supports proper return/release so the shoes don’t bind or drag

These parts often corrode, wear, or deform with age. A tired expander bow can lead to weak handbrake performance, sticking shoes, or poor release - causing overheating and unnecessary wear in the parking brake assembly. Replacing them as a complete set helps restore correct function on both sides.

When to replace:
•  Handbrake holding force is weak even after adjustment
•  Shoes don’t release cleanly / rear brakes run hot
•  Visible corrosion, bending, or wear on the expander hardware
•  During handbrake shoe replacement or full parking brake overhaul

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