* Mounting: The booster's mounting points on the firewall and its connection to the master cylinder are unique.
* Pushrod Length: The length of the pushrod connecting the booster to the master cylinder is critical and varies between models.
* Vacuum Diaphragm Size & Design: The size and design of the vacuum diaphragm within the booster are specific to the system's requirements.
* Bore Size: The booster itself will have a specific bore size which impacts braking performance.
While some generic boosters might *appear* similar, crucial dimensions are almost certainly different, preventing safe and effective installation. Using an incorrect booster could lead to:
* Brake failure: The most serious consequence.
* Poor braking performance: Weak or inconsistent braking.
* Damage to other brake components: Incorrect pushrod length or booster operation could damage the master cylinder or other parts.
Your best bet for a replacement is to find a NOS (New Old Stock) booster specific to your 1961 Cadillac, or a rebuilt one from a reputable classic car parts supplier. Searching online using the correct year, make, and model information is the best starting point.
