Some time in late April into May was the change over ....... related to the change in brake fluid (Red decal- red high temp fluid) and different seals as a result. Jeff S -----Original Message----- From: DMGT350@aol.com Sent: Sep 12, 2005 2:28 PM To: shelbymustang@carmemories.com Subject: Master Cylinder Cap Question Does anyone know when in 66 the disk brake master cylinder caps started carrying the decal on top? I thought it was sometime in March but can't seem to find my reference. Thanks.