Universal aluminum brake master cylinder

Ricks70Duster340 said

Have manual brakes. When I got the car the front disc brakes were not original so not sure what was correct or not with the MC. In my case to make the new alum MC work properly I had to use the adj pushrod.

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Probably because you had the wrong pushrod to begin with. The DoctorDiff master cylinder doesn't require the adjustable push rod, as I said I run mine with a factory manual brake push rod and it works great, no change in pedal height from original.