2000 Jaguar S Type 3.0. Had mushy brakes. Looked thru posts and could not find answer. I had Pep Boys bleed system and put on new brake pads. Brakes were a little mushy so had the above done. Now with engine off I pumped the brake untill hard then started engine and when I pushed down on the brake it got soft and traveled to the floor almost to the bottom. I can drive the jag and have brakes, however still mushy and fades to the floor then brakes. I think a post stated could have problem when changing rear brakes and pushing cly in without using the bleeders could cause some problem while others said just to take off resv cover and will be ok. Not sure but seems like problem with brake master cly with eng in on but not running brake gets real hard then soft and fades after I start eng. Booster pumping pressure ok. Could use some ideas. Kind of feel like Master cly . No fluid leaks noted.

 

My findings on this over the years with these beasts.

Changing the pads WITHOUT undoing the bleeders prior to pushing the pistons back is asking for trouble.. Maybe NOT this time, but it will bite ya eventually.

A brake pedal doing what you describe has always been solved for me with a replacement/rebuilt/new, master cylinder. A complete fluid flush at the same time, THEN, a simple fluid purge every 12 months (takes about 20 minutes), and the system will stay clean, and your wallet a tad fatter.

 

Thanks Grant. I will do the master, fluid change, and bleed. wasnt sure other problems caused by not using the bleeders. Love my beast