Rear Brake Calliper bolt thread on a 172

[jaysjetski]

just a quick one, i didnt know this but have found out one of the holding bolts has been heli-coiled. does anyone know the thread pattern as i need a new heli-coil as it has rusted to bits.

the bolts in question hold the calliper to the rear beam.

please help asap as the car is my daily driver.

 

[jaysjetski]

anyone

 

[olddan]

Can you not measure the pitch and size on the bolt that has come out?

 

[jaysjetski]

i sure i could if i knew how the measure the pitch. its about 12mm but i dont think its a metric thread.

anyone know or could tell me??

 

[olddan]

Not sure on size but you measure the thread with a pitch gauge. Take it to any machining shop they will be able to tell you.