Synchro Brake Band 3rd / 4th / 5th Gear. Porsche 911 1974-86 (915 Gearbox)  ❭  91130231608

Synchro Brake Band 3rd / 4th / 5th gear
Genuine Porsche OE synchro brake band for 3rd, 4th and 5th gear on Porsche 911 models fitted with the 915 manual gearbox. This original Porsche gearbox synchroniser component is used inside the transmission to help control gear speed during gear changes, supporting smoother engagement and helping reduce gear clash or grinding.
3 per gearbox. *please note: these are 1/2 pieces so order 2 pcs to make one complete brake band

Fits:
Porsche 911 1974 - 1986 (915 Gearbox)

Diagram ref no 8.

The Genuine Porsche 91130231608 synchro brake band is an OE gearbox synchroniser component for 3rd, 4th and 5th gear in Porsche 911 models fitted with the 915 manual transmission. It helps control gear speed during shifting, supports smoother gear engagement and is commonly replaced during 915 gearbox rebuilds, synchro repairs or transmission restoration work.

This part fits inside the manual gearbox, within the synchroniser assembly for 3rd, 4th and 5th gears. It is not an external service item and requires gearbox disassembly for installation.

On the Porsche 915 gearbox diagram, this part is associated with the internal synchro / brake band assembly.

Functions
• Forms part of the gearbox synchroniser assembly
• Helps control and slow gear rotation during gear selection
• Supports smoother engagement of 3rd, 4th and 5th gears
• Helps reduce gear crunching, baulking or grinding during shifts
• Works with the synchro ring, dog teeth and slider components
• Helps restore correct synchroniser operation during gearbox rebuilds
• Maintains factory-correct Porsche transmission performance when fitted with matching OE gearbox components

Why Replace This Part?
The synchro brake band is a wear component inside the manual gearbox. Over time, repeated gear changes, high mileage, worn oil, aggressive shifting or previous gearbox wear can reduce its effectiveness. A worn brake band may no longer control gear speed correctly, which can lead to difficult shifting, gear crunching or poor synchroniser performance. Replacing the worn brake band with a Genuine Porsche OE synchro brake band helps restore correct synchroniser function and supports smooth, precise gear engagement in the 915 gearbox.

When to replace
•   During a Porsche 915 gearbox rebuild or overhaul
•   If 3rd, 4th or 5th gear engagement is difficult or notchy
•   If the gearbox crunches or grinds during gear changes
•   When replacing synchro rings, dog teeth or slider sleeves
•   If inspection shows wear, glazing, cracking or damage
•   When restoring the gearbox to original Porsche specification
•   As part of preventative maintenance during transmission disassembly.

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

91130231608

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